[ { "regions": [ { "regionID": "CH-2122" }, { "regionID": "CH-1246" }, { "regionID": "CH-3113" }, { "regionID": "CH-5211" }, { "regionID": "CH-2223" }, { "regionID": "CH-4115" }, { "regionID": "CH-4215" }, { "regionID": "CH-4211" }, { "regionID": "CH-1312" }, { "regionID": "CH-2212" }, { "regionID": "CH-2222" }, { "regionID": "CH-4121" }, { "regionID": "CH-2221" }, { "regionID": "CH-1223" }, { "regionID": "CH-2134" }, { "regionID": "CH-3114" }, { "regionID": "CH-1227" }, { "regionID": "CH-3112" }, { "regionID": "CH-1232" }, { "regionID": "CH-4243" }, { "regionID": "CH-4122" }, { "regionID": "CH-4221" }, { "regionID": "CH-4114" }, { "regionID": "CH-1247" }, { "regionID": "CH-4112" }, { "regionID": "CH-4213" }, { "regionID": "CH-2211" }, { "regionID": "CH-4212" }, { "regionID": "CH-4214" }, { "regionID": "CH-1114" }, { "regionID": "CH-1243" }, { "regionID": "CH-1245" }, { "regionID": "CH-4124" }, { "regionID": "CH-4111" }, { "regionID": "CH-1225" }, { "regionID": "CH-1234" }, { "regionID": "CH-4241" } ], "validTime": { "startTime": "2021-05-09T17:00:00+02:00", "endTime": "2021-05-10T12:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2800" }, "customData": [], "mainValue": "considerable", "aspect": [ "N", "NE", "E", "W", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89485958948597", "avalancheActivityComment": "As a consequence of a strong to storm force southerly wind, avalanche prone wind slabs will form at elevated altitudes. They are clearly recognisable to the trained eye. Single winter sport participants can release avalanches. In some places dry avalanches can also release deeper layers of the snowpack and reach large size. \n Ski touring calls for experience in the assessment of avalanche danger." }, { "regions": [ { "regionID": "CH-2122" }, { "regionID": "CH-1246" }, { "regionID": "CH-3113" }, { "regionID": "CH-5211" }, { "regionID": "CH-2223" }, { "regionID": "CH-4115" }, { "regionID": "CH-4215" }, { "regionID": "CH-4211" }, { "regionID": "CH-1312" }, { "regionID": "CH-2212" }, { "regionID": "CH-2222" }, { "regionID": "CH-4121" }, { "regionID": "CH-2221" }, { "regionID": "CH-1223" }, { "regionID": "CH-2134" }, { "regionID": "CH-3114" }, { "regionID": "CH-1227" }, { "regionID": "CH-3112" }, { "regionID": "CH-1232" }, { "regionID": "CH-4243" }, { "regionID": "CH-4122" }, { "regionID": "CH-4221" }, { "regionID": "CH-4114" }, { "regionID": "CH-1247" }, { "regionID": "CH-4112" }, { "regionID": "CH-4213" }, { "regionID": "CH-2211" }, { "regionID": "CH-4212" }, { "regionID": "CH-4214" }, { "regionID": "CH-1114" }, { "regionID": "CH-1243" }, { "regionID": "CH-1245" }, { "regionID": "CH-4124" }, { "regionID": "CH-4111" }, { "regionID": "CH-1225" }, { "regionID": "CH-1234" }, { "regionID": "CH-4241" } ], "validTime": { "startTime": "2021-05-10T12:00:00+02:00", "endTime": "2021-05-10T17:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2800" }, "customData": [], "mainValue": "considerable", "aspect": [ "N", "NE", "E", "W", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89485958948597_pm", "predecessor_id": "89485958948597", "avalancheActivityComment": "As a consequence of a strong to storm force southerly wind, avalanche prone wind slabs will form at elevated altitudes. They are clearly recognisable to the trained eye. Single winter sport participants can release avalanches. In some places dry avalanches can also release deeper layers of the snowpack and reach large size. \n Ski touring calls for experience in the assessment of avalanche danger.\nOutgoing longwave radiation during the night will be reduced. The danger of wet avalanches will increase during the day. Below approximately 2800 m wet avalanches are to be expected, even large ones in isolated cases. Backcountry tours should be started early and concluded timely." }, { "regions": [ { "regionID": "CH-3224" }, { "regionID": "CH-1222" }, { "regionID": "CH-1241" }, { "regionID": "CH-1226" }, { "regionID": "CH-1244" }, { "regionID": "CH-1242" }, { "regionID": "CH-1228" }, { "regionID": "CH-3223" }, { "regionID": "CH-1233" }, { "regionID": "CH-1231" }, { "regionID": "CH-2123" }, { "regionID": "CH-3222" }, { "regionID": "CH-3311" }, { "regionID": "CH-1224" } ], "validTime": { "startTime": "2021-05-09T17:00:00+02:00", "endTime": "2021-05-10T12:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2200" }, "customData": [], "mainValue": "moderate", "aspect": [ "N", "NE", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89485968948597", "avalancheActivityComment": "As a consequence of a strong southerly wind, avalanche prone wind slabs will form. They are clearly recognisable to the trained eye. The wind slabs are to be evaluated with care and prudence in steep terrain. Avalanches can in some cases reach medium size." }, { "regions": [ { "regionID": "CH-3224" }, { "regionID": "CH-1222" }, { "regionID": "CH-1241" }, { "regionID": "CH-1226" }, { "regionID": "CH-1244" }, { "regionID": "CH-1242" }, { "regionID": "CH-1228" }, { "regionID": "CH-3223" }, { "regionID": "CH-1233" }, { "regionID": "CH-1231" }, { "regionID": "CH-2123" }, { "regionID": "CH-3222" }, { "regionID": "CH-3311" }, { "regionID": "CH-1224" } ], "validTime": { "startTime": "2021-05-10T12:00:00+02:00", "endTime": "2021-05-10T17:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2200" }, "customData": [], "mainValue": "considerable", "aspect": [ "N", "NE", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89485968948597_pm", "predecessor_id": "89485968948597", "avalancheActivityComment": "As a consequence of a strong southerly wind, avalanche prone wind slabs will form. They are clearly recognisable to the trained eye. The wind slabs are to be evaluated with care and prudence in steep terrain. Avalanches can in some cases reach medium size.\nOutgoing longwave radiation during the night will be reduced. The danger of wet avalanches will increase during the day. Below approximately 2800 m wet avalanches are to be expected, even large ones in isolated cases. Backcountry tours should be started early and concluded timely." }, { "regions": [ { "regionID": "CH-2112" }, { "regionID": "CH-6131" }, { "regionID": "CH-1211" }, { "regionID": "CH-2131" }, { "regionID": "CH-6132" }, { "regionID": "CH-1212" }, { "regionID": "CH-3221" }, { "regionID": "CH-3211" }, { "regionID": "CH-1122" } ], "validTime": { "startTime": "2021-05-09T17:00:00+02:00", "endTime": "2021-05-10T12:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": {}, "customData": [], "mainValue": "low", "aspect": [] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89485948948598", "avalancheActivityComment": "Only a little snow is lying. Dry avalanches are no longer to be expected." }, { "regions": [ { "regionID": "CH-2112" }, { "regionID": "CH-6131" }, { "regionID": "CH-1211" }, { "regionID": "CH-2131" }, { "regionID": "CH-6132" }, { "regionID": "CH-1212" }, { "regionID": "CH-3221" }, { "regionID": "CH-3211" }, { "regionID": "CH-1122" } ], "validTime": { "startTime": "2021-05-10T12:00:00+02:00", "endTime": "2021-05-10T17:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": {}, "customData": [], "mainValue": "low", "aspect": [] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89485948948598_pm", "predecessor_id": "89485948948598", "avalancheActivityComment": "Only a little snow is lying. Dry avalanches are no longer to be expected.\nOn north facing slopes individual gliding avalanches and moist snow slides are possible." }, { "regions": [ { "regionID": "CH-3111" }, { "regionID": "CH-2133" }, { "regionID": "CH-1311" }, { "regionID": "CH-1111" }, { "regionID": "CH-2124" }, { "regionID": "CH-1112" }, { "regionID": "CH-1113" }, { "regionID": "CH-2132" } ], "validTime": { "startTime": "2021-05-09T17:00:00+02:00", "endTime": "2021-05-10T12:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2200" }, "customData": [], "mainValue": "moderate", "aspect": [ "N", "NE", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89485968948599", "avalancheActivityComment": "As a consequence of a strong southerly wind, avalanche prone wind slabs will form. They are clearly recognisable to the trained eye. The wind slabs are to be evaluated with care and prudence in steep terrain. Avalanches can in some cases reach medium size." }, { "regions": [ { "regionID": "CH-3111" }, { "regionID": "CH-2133" }, { "regionID": "CH-1311" }, { "regionID": "CH-1111" }, { "regionID": "CH-2124" }, { "regionID": "CH-1112" }, { "regionID": "CH-1113" }, { "regionID": "CH-2132" } ], "validTime": { "startTime": "2021-05-10T12:00:00+02:00", "endTime": "2021-05-10T17:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2200" }, "customData": [], "mainValue": "moderate", "aspect": [ "N", "NE", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89485968948599_pm", "predecessor_id": "89485968948599", "avalancheActivityComment": "As a consequence of a strong southerly wind, avalanche prone wind slabs will form. They are clearly recognisable to the trained eye. The wind slabs are to be evaluated with care and prudence in steep terrain. Avalanches can in some cases reach medium size.\nOutgoing longwave radiation during the night will be reduced. The danger of wet avalanches will increase a little during the day. In all aspects wet and gliding avalanches are possible as a consequence of warming during the day and solar radiation. These can reach medium size." }, { "regions": [ { "regionID": "CH-1121" }, { "regionID": "CH-2121" }, { "regionID": "CH-2111" }, { "regionID": "CH-1213" }, { "regionID": "CH-1221" } ], "validTime": { "startTime": "2021-05-09T17:00:00+02:00", "endTime": "2021-05-10T12:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": {}, "customData": [], "mainValue": "low", "aspect": [] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89485948948599", "avalancheActivityComment": "Only a little snow is lying. Dry avalanches are no longer to be expected." }, { "regions": [ { "regionID": "CH-1121" }, { "regionID": "CH-2121" }, { "regionID": "CH-2111" }, { "regionID": "CH-1213" }, { "regionID": "CH-1221" } ], "validTime": { "startTime": "2021-05-10T12:00:00+02:00", "endTime": "2021-05-10T17:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": {}, "customData": [], "mainValue": "moderate", "aspect": [] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89485948948599_pm", "predecessor_id": "89485948948599", "avalancheActivityComment": "Only a little snow is lying. Dry avalanches are no longer to be expected.\nOutgoing longwave radiation during the night will be reduced. The danger of wet avalanches will increase a little during the day. In all aspects wet and gliding avalanches are possible as a consequence of warming during the day and solar radiation. These can reach medium size." }, { "regions": [ { "regionID": "CH-6211" }, { "regionID": "CH-5216" }, { "regionID": "CH-5123" }, { "regionID": "CH-7231" }, { "regionID": "CH-7122" }, { "regionID": "CH-7211" }, { "regionID": "CH-7221" }, { "regionID": "CH-5215" }, { "regionID": "CH-7114" }, { "regionID": "CH-5124" }, { "regionID": "CH-7123" }, { "regionID": "CH-5231" }, { "regionID": "CH-5113" }, { "regionID": "CH-5223" }, { "regionID": "CH-5234" }, { "regionID": "CH-7113" }, { "regionID": "CH-7125" }, { "regionID": "CH-5214" }, { "regionID": "CH-5221" }, { "regionID": "CH-5121" }, { "regionID": "CH-7115" }, { "regionID": "CH-5112" }, { "regionID": "CH-7112" }, { "regionID": "CH-5222" }, { "regionID": "CH-7222" }, { "regionID": "CH-5111" }, { "regionID": "CH-7111" }, { "regionID": "CH-7126" }, { "regionID": "CH-7124" }, { "regionID": "CH-7121" }, { "regionID": "CH-6113" }, { "regionID": "CH-5122" }, { "regionID": "CH-5232" }, { "regionID": "CH-5233" } ], "validTime": { "startTime": "2021-05-09T17:00:00+02:00", "endTime": "2021-05-10T12:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2600" }, "customData": [], "mainValue": "moderate", "aspect": [ "N", "NE", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89485938948597", "avalancheActivityComment": "As a consequence of a strong to storm force southerly wind, avalanche prone wind slabs will form at elevated altitudes. They are clearly recognisable to the trained eye. They are to be evaluated with care and prudence in steep terrain." }, { "regions": [ { "regionID": "CH-6211" }, { "regionID": "CH-5216" }, { "regionID": "CH-5123" }, { "regionID": "CH-7231" }, { "regionID": "CH-7122" }, { "regionID": "CH-7211" }, { "regionID": "CH-7221" }, { "regionID": "CH-5215" }, { "regionID": "CH-7114" }, { "regionID": "CH-5124" }, { "regionID": "CH-7123" }, { "regionID": "CH-5231" }, { "regionID": "CH-5113" }, { "regionID": "CH-5223" }, { "regionID": "CH-5234" }, { "regionID": "CH-7113" }, { "regionID": "CH-7125" }, { "regionID": "CH-5214" }, { "regionID": "CH-5221" }, { "regionID": "CH-5121" }, { "regionID": "CH-7115" }, { "regionID": "CH-5112" }, { "regionID": "CH-7112" }, { "regionID": "CH-5222" }, { "regionID": "CH-7222" }, { "regionID": "CH-5111" }, { "regionID": "CH-7111" }, { "regionID": "CH-7126" }, { "regionID": "CH-7124" }, { "regionID": "CH-7121" }, { "regionID": "CH-6113" }, { "regionID": "CH-5122" }, { "regionID": "CH-5232" }, { "regionID": "CH-5233" } ], "validTime": { "startTime": "2021-05-10T12:00:00+02:00", "endTime": "2021-05-10T17:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2600" }, "customData": [], "mainValue": "considerable", "aspect": [ "N", "NE", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89485938948597_pm", "predecessor_id": "89485938948597", "avalancheActivityComment": "As a consequence of a strong to storm force southerly wind, avalanche prone wind slabs will form at elevated altitudes. They are clearly recognisable to the trained eye. They are to be evaluated with care and prudence in steep terrain.\nOutgoing longwave radiation during the night will be reduced. The danger of wet avalanches will increase during the day. Below approximately 2800 m wet avalanches are to be expected, even large ones in isolated cases. Backcountry tours should be started early and concluded timely." }, { "regions": [ { "regionID": "CH-4116" }, { "regionID": "CH-4223" }, { "regionID": "CH-5212" }, { "regionID": "CH-4224" }, { "regionID": "CH-4123" }, { "regionID": "CH-4113" }, { "regionID": "CH-6111" }, { "regionID": "CH-4231" }, { "regionID": "CH-4244" }, { "regionID": "CH-6112" }, { "regionID": "CH-4225" }, { "regionID": "CH-2224" }, { "regionID": "CH-6114" }, { "regionID": "CH-4125" }, { "regionID": "CH-4222" }, { "regionID": "CH-4242" }, { "regionID": "CH-4232" } ], "validTime": { "startTime": "2021-05-09T17:00:00+02:00", "endTime": "2021-05-10T12:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2800" }, "customData": [], "mainValue": "considerable", "aspect": [ "N", "NE", "E", "W", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89486008948601", "avalancheActivityComment": "As a consequence of new snow and a strong to storm force southerly wind, large wind slabs will form at elevated altitudes. The new snow and wind slabs are prone to triggering. As the snowfall becomes more intense the avalanche prone locations will become more prevalent as the day progresses. An increasing number of medium-sized and, in isolated cases, large natural avalanches are possible in the afternoon. \n Ski touring calls for extensive experience in the assessment of avalanche danger." }, { "regions": [ { "regionID": "CH-4116" }, { "regionID": "CH-4223" }, { "regionID": "CH-5212" }, { "regionID": "CH-4224" }, { "regionID": "CH-4123" }, { "regionID": "CH-4113" }, { "regionID": "CH-6111" }, { "regionID": "CH-4231" }, { "regionID": "CH-4244" }, { "regionID": "CH-6112" }, { "regionID": "CH-4225" }, { "regionID": "CH-2224" }, { "regionID": "CH-6114" }, { "regionID": "CH-4125" }, { "regionID": "CH-4222" }, { "regionID": "CH-4242" }, { "regionID": "CH-4232" } ], "validTime": { "startTime": "2021-05-10T12:00:00+02:00", "endTime": "2021-05-10T17:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2800" }, "customData": [], "mainValue": "considerable", "aspect": [ "N", "NE", "E", "W", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89486008948601_pm", "predecessor_id": "89486008948601", "avalancheActivityComment": "As a consequence of new snow and a strong to storm force southerly wind, large wind slabs will form at elevated altitudes. The new snow and wind slabs are prone to triggering. As the snowfall becomes more intense the avalanche prone locations will become more prevalent as the day progresses. An increasing number of medium-sized and, in isolated cases, large natural avalanches are possible in the afternoon. \n Ski touring calls for extensive experience in the assessment of avalanche danger.\nThe danger of wet avalanches will already exist in the early morning. As the day progresses as the precipitation becomes more intense there will be an increase in the danger of wet avalanches within the current danger level. Below approximately 2800 m wet avalanches are to be expected, even large ones in isolated cases." }, { "regions": [ { "regionID": "CH-6115" }, { "regionID": "CH-6122" }, { "regionID": "CH-6212" }, { "regionID": "CH-6121" } ], "validTime": { "startTime": "2021-05-09T17:00:00+02:00", "endTime": "2021-05-10T12:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2600" }, "customData": [], "mainValue": "moderate", "aspect": [ "N", "NE", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89485938948599", "avalancheActivityComment": "As a consequence of a strong to storm force southerly wind, avalanche prone wind slabs will form at elevated altitudes. They are clearly recognisable to the trained eye. They are to be evaluated with care and prudence in steep terrain." }, { "regions": [ { "regionID": "CH-6115" }, { "regionID": "CH-6122" }, { "regionID": "CH-6212" }, { "regionID": "CH-6121" } ], "validTime": { "startTime": "2021-05-10T12:00:00+02:00", "endTime": "2021-05-10T17:00:00+02:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2600" }, "customData": [], "mainValue": "moderate", "aspect": [ "N", "NE", "NW" ] } ], "avalancheProblems": [], "tendency": { "validTime": {}, "tendencyComment": "Tuesday: On the Main Alpine Ridge and southwards therefrom, intensive snowfall is anticipated. In the Upper Valais sector of the Main Alpine Ridge and in the northwestern part of Ticino, an additional 100 cm of fresh snow could be registered above approximately 2500 m. The snowfall level is expected to descend down to 2000 m by evening. Also in the western regions, snowfall will set in above approximately 2000 m. In the eastern regions it will remain dry to begin with, during the afternoon a small amount of snowfall is expected. \n Avalanche danger levels are expected to increase significantly over widespread areas in southern regions. Danger Level 4 (High) will be reached. Above 2400 m, naturally triggered dry-snow avalanches are anticipated, and in addition to these, numerous wet-snow avalanches as a result of the intensive rainfall. These releases can grow to large size and, in isolated cases, even to very large size. \n Also in the western regions, avalanche danger levels will increase somewhat. In the eastern regions the avalanche danger level is not expected to change significantly. \nWednesday: During the night, i.e. by midday, the snowfall is expected to come to a close in the southern regions and during the daytime hours it will become partly sunny. In the northern regions, heavy snowfall is anticipated during the nocturnal hours. During the daytime the snowfall will slacken off from the west. The snowfall level will still lie at 1800 m during the night, subsequently descend to 1500 m in the early morning hours. The avalanche situation in the southern regions will remain critical. As a result of solar radiation, numerous wet-snow avalanches can be expected. In the northern regions, avalanche danger levels will increase in all areas as a result of fresh fallen snow." }, "publicationTime": "2021-05-09T17:00:00+02:00", "avalancheActivityHighlights": "Considerable danger of dry and wet avalanches will be encountered in some regions", "snowpackStructureComment": "At elevated altitudes on the Main Alpine Ridge and in the northwestern part of the Ticino, large-sized snowdrift accumulations are being generated as a result of fresh snow and storm-strength southerly winds. In the remaining regions of Switzerland the storm winds are transporting the loosely-packed old snow at high altitudes more than anywhere else, and snowdrift accumulations are being generated which are prone to triggering. These drifts are, however, not far-reaching or wide-surfaced. \n Beneath the fresh snow and fresh snowdrifts which were generated this week, the old snow is thoroughly wet below approximately 3000 m on east-facing, south-facing and west-facing slopes; below 2200 to 2500 m on north-facing slopes. As a result of the mild temperatures, and the rainfall in southern regions as well as the solar radiation in the foehn-influenced regions, naturally-triggered wet-snow and gliding avalanches can be expected, including large-sized releases.", "wxSynopsisComment": "Nighttime skies in the southern regions were partly overcast, in the other regions of Switzerland skies were clear. During the daytime hours the cloud cover increased in southern regions, in the other regions it was predominantly sunny and extremely warm. \nFresh snow: - \nTemperature: At midday at 2000 m, between +12 \u00b0C in the northern regions and +7 \u00b0C in the southern regions. \nWind: - Nocturnal winds were blowing predominantly at moderate strength from southwesterly directions;\n - during the daytime hours blowing at light to moderate strength to start with, during the course of the day blowing at moderate to strong velocity, from southerly directions.\nDuring the night in the Valais sector of the Main Alpine Ridge and in the Ticino, snowfall is anticipated above approximately 2600 m. The snowfall will intensify during the daytime hours, and subsequently extend into the eastern part of the Bernese Oberland. \n In the remaining regions of Switzerland, nighttime skies will frequently be overcast and the outgoing longwave radiation will be reduced. During the daytime, snowfall is expected to set in above 2500 m also in the northwestern regions. In the eastern regions there will be foehn-induced bright intervals and it is expected to remain dry until evening. \nFresh snow: By Monday afternoon, the following amounts of fresh snow are anticipated above approximately 2800 m: - along the Italian border from Monte Rosa into the Bedretto valley: 40 to 60 cm;\n - remaining parts of the Valais sector of the Main Alpine Ridge, remaining parts of northern Ticino: 20 to 40 cm;\n - In the other regions of Switzerland: less; from Brienzersee over the Alpstein, in northern and central Grisons into the Lower Engadine it will remain dry. \n \n \n \nTemperature: At midday at 2000 m, at +7 \u00b0C. \nWind: - Winds will be blowing at strong-to-storm strength from southerly directions;\n - in the Alpine valleys, a strong foehn wind will prevail.", "bulletinID": "89485938948599_pm", "predecessor_id": "89485938948599", "avalancheActivityComment": "As a consequence of a strong to storm force southerly wind, avalanche prone wind slabs will form at elevated altitudes. They are clearly recognisable to the trained eye. They are to be evaluated with care and prudence in steep terrain.\nOutgoing longwave radiation during the night will be reduced. The danger of wet avalanches will increase a little during the day. In all aspects wet and gliding avalanches are possible as a consequence of warming during the day and solar radiation. These can reach medium size." } ]