{ "bulletins": [ { "regions": [ { "regionID": "AT-05-19" }, { "regionID": "AT-05-20" }, { "regionID": "AT-05-21" }, { "regionID": "AT-05-18" }, { "regionID": "AT-05-14" }, { "regionID": "AT-05-15" }, { "regionID": "AT-05-13" }, { "regionID": "AT-05-12" } ], "validTime": { "startTime": "2021-12-03T23:00:00+00:00", "endTime": "2021-12-04T23:00:00+00:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "Treeline" }, "customData": [], "mainValue": "moderate" }, { "elevation": { "upperBound": "Treeline" }, "customData": [], "mainValue": "low" } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "N", "NE", "E", "W", "NW" ] }, "problemType": "wind_drifted_snow", "comment": "near ridgelines, mostly small-sized" }, { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "E", "SE", "S", "SW", "W" ] }, "problemType": "wet_snow", "comment": "superficial loose-snow avalanches and isolated glide-snow avalanches in extremely steep terrain" } ], "tendency": { "validTime": {}, "tendencyComment": "As a result of fresh snow and westerly winds, fresh snowdrifts will accumulate. Avalanche danger levels will rise." }, "bulletinID": "RID1025RGR1", "publicationTime": "2021-12-03T17:00:00+00:00", "avalancheActivityHighlights": "AVOID snowdrift accumulations near ridgelines", "wxSynopsisComment": "Overcast skies from the start. Summits are free of cloud, only the highest peaks are in fog. Further north, intermittent snowfall is possible, snowfall level ascending to over 1600 m. At 1500 m, temperatures rising to +2 degrees; at 2000 m to +1 degree. Southerly winds at 30-40 km/hr will prevail above the timberline.\r\nOn Saturday night and during the daytime on Sunday, 10-20 cm of fresh snow is anticipated. On Sunday the peaks will often be veiled in cloud, intermittent snowfall is anticipated. At high altitudes, a strong NW wind will be blowing which will slacken off somewhat in the afternoon. Temperatures will drop: at 2000 m to -9 degrees.", "avalancheActivityComment": "Avalanche danger is LOW, but in the exposed zones near ridgelines MODERATE. Dangers are focused on steep zones near ridgelines in extended northern aspects (W/N/W) where fresh drifts can often be easily triggered. Small-to-medium sized slabs are possible.\r\nNaturally triggered shallow loose-snow avalanches (small-sized) in steep terrain and, on grassy slopes, isolated glide-snow avalanches are possible.", "snowpackStructureComment": "The cold fresh snow from Thursday daytime and Thursday night (10-20 cm) will be transported by southerly winds to north-facing slopes on Friday. The freshly generated drifts will lie atop cold and loose snow. At low and intermediate altitudes the snow will become superficially moist. The old snow beneath it is relatively compact and evidences no pronounced weak layers. The snowpack is gliding somewhat over the warm, smooth ground." }, { "regions": [ { "regionID": "AT-05-11" }, { "regionID": "AT-05-07" }, { "regionID": "AT-05-10" }, { "regionID": "AT-05-06" }, { "regionID": "AT-05-09" }, { "regionID": "AT-05-08" }, { "regionID": "AT-05-04" }, { "regionID": "AT-05-05" }, { "regionID": "AT-05-03" }, { "regionID": "AT-05-02" } ], "validTime": { "startTime": "2021-12-03T23:00:00+00:00", "endTime": "2021-12-04T23:00:00+00:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "Treeline" }, "customData": [], "mainValue": "considerable" }, { "elevation": { "upperBound": "Treeline" }, "customData": [], "mainValue": "moderate" } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "N", "NE", "E", "SE", "S", "SW", "W", "NW" ] }, "problemType": "wind_drifted_snow", "comment": "near to and distant from ridgelines, wide-ranging in foehn lanes" }, { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "E", "SE", "S", "SW", "W" ] }, "problemType": "wet_snow", "comment": "superficial loose-snow avalanches and isolated glide-snow avalanches in extremely steep terrain" } ], "tendency": { "validTime": {}, "tendencyComment": "Unchanged: great caution urged! As a result of fresh snow and westerly winds, fresh and wide-ranging snowdrift masses will form, deposited again on east-facing and south-facing slopes." }, "bulletinID": "RID1025RGR2", "publicationTime": "2021-12-03T17:00:00+00:00", "avalancheActivityHighlights": "Caution! Wide ranging foehn-induced snowdrifts in places - easily triggered!", "wxSynopsisComment": "Overcast skies from the start. Summits are free of cloud, only the highest peaks are in fog. Further north, intermittent snowfall is possible. At 2000 m temperatures rising to +1 degree, at 3000 m to -6 degrees. Southerly winds at 40-60 km/hr will prevail.\r\nOn Saturday night and during the daytime on Sunday, 20-30 cm of fresh snow is anticipated. On Sunday the peaks will often be veiled in cloud, intermittent snowfall is anticipated. At high altitudes, a strong NW wind will be blowing (40-60 km/hr) which will slacken off somewhat in the afternoon. Temperatures will drop: at 2000 m to -9 degrees, at 3000 m -16 degrees.", "avalancheActivityComment": "Restraint is imperative. Foehn winds are changing the conditions before our eyes, avalanche prone locations are different from what they were yesterday. Above the timberline, fresh snowdrifts are easily triggered, even the impulse of one sole person can trigger a medium-to-large slab avalanche. All aspects are treacherous, but particularly the northern aspects (W/N/E). Due to windblown terrain and high degree of roughness of the ground, the danger zones can easily be underestimated.\r\nSecond danger: very steep terrain, where small-to-medium superficial loose-snow avalanches and isolated glide-snow avalanches can trigger naturally as a result of the higher temperatures.", "snowpackStructureComment": "The cold fresh snow from Thursday daytime and Thursday night (20-40 cm) will be transported by southerly winds to north-facing slopes on Friday. The freshly generated drifts will lie atop cold and loose snow. At low and intermediate altitudes the snow will become superficially moist. Starting at 2200 m, there is a thin fracturable melt-freeze crust from mid-November (old-snow problem) at least in extended northern aspects." }, { "regions": [ { "regionID": "AT-05-17" }, { "regionID": "AT-05-16" } ], "validTime": { "startTime": "2021-12-03T23:00:00+00:00", "endTime": "2021-12-04T23:00:00+00:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "2000" }, "customData": [], "mainValue": "considerable" }, { "elevation": { "upperBound": "2000" }, "customData": [], "mainValue": "low" } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "N", "NE", "E", "W", "NW" ] }, "problemType": "wind_drifted_snow", "comment": "near to and distant from ridgelines" }, { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "E", "SE", "S", "SW", "W" ] }, "problemType": "wet_snow", "comment": null } ], "tendency": { "validTime": {}, "tendencyComment": "As a result of fresh snowfall and westerly winds, fresh snowdrift accumulations will be generated. Avalanche danger levels will increase." }, "bulletinID": "RID1025RGR3", "publicationTime": "2021-12-03T17:00:00+00:00", "avalancheActivityHighlights": "Foehn wind generating fresh snowdrifts onto north-facing slopes", "wxSynopsisComment": "Overcast skies from the start. Summits are free of cloud, only the highest peaks are in fog. Further north, intermittent snowfall is possible, snowfall level ascending to over 1600 m. At 2000 m temperatures rising to +1 degree, at 3000 m to -6 degrees. Southerly winds at 40 km/hr will prevail above 2000 m.\r\nOn Saturday night and during the daytime on Sunday, 10-20 cm of fresh snow is anticipated. On Sunday the peaks will often be veiled in cloud, intermittent snowfall is anticipated. At high altitudes, a strong NW wind will be blowing (40-60 km/hr) which will slacken off somewhat in the afternoon. Temperatures will drop: at 2000 m to -9 degrees.", "avalancheActivityComment": "Fresh snowdrifts occur as of the timberline in places. Starting at 2000 m in northern aspects they are easily triggered. The impulse of one single person can trigger a medium-to-large slab avalanche. Especially treacherous are W/N/E aspects. Due to windblown terrain and the generally rough ground in backcountry touring zones, avalanche prone locations are easy to underestimate.\r\nSecond danger: very steep terrain, where small-to-medium superficial loose-snow avalanches and isolated glide-snow avalanches can trigger naturally as a result of the higher temperatures.", "snowpackStructureComment": "The cold fresh snow from Thursday daytime and Thursday night (15-30 cm) will be transported by southerly winds to north-facing slopes on Friday. In classic foehn lanes these will be deposited atop cold and loosely-packed snow. At low and intermediate altitudes the snow will become superficially moist." }, { "regions": [ { "regionID": "AT-05-01" } ], "validTime": { "startTime": "2021-12-03T23:00:00+00:00", "endTime": "2021-12-04T23:00:00+00:00" }, "source": {}, "dangerRatings": [ { "elevation": { "lowerBound": "Treeline" }, "customData": [], "mainValue": "moderate" }, { "elevation": { "upperBound": "Treeline" }, "customData": [], "mainValue": "low" } ], "avalancheProblems": [ { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "N", "NE", "E", "W", "NW" ] }, "problemType": "wind_drifted_snow", "comment": "near ridgelines, mostly small" }, { "dangerRating": { "elevation": {}, "customData": [], "aspect": [ "E", "SE", "S", "SW", "W" ] }, "problemType": "wet_snow", "comment": "superficial loose-snow avalanches and isolated glide-snow avalanches in extremely steep terrain" } ], "tendency": { "validTime": {}, "tendencyComment": "As a result of fresh snow and NW winds, fresh snowdrifts will accumulate. Avalanche danger levels will rise." }, "bulletinID": "RID1025RGR4", "publicationTime": "2021-12-03T17:00:00+00:00", "avalancheActivityHighlights": "AVOID ridgeline snowdrift accumulations", "wxSynopsisComment": "Overcast skies from the start. Summits are free of cloud, only the highest peaks are in fog, a bit of sunshine is possible. Later on, intermittent snowfall is possible. At 2000 m temperatures rising to +1 degree, at 3000 m to -6 degrees. Southerly winds at 40 km/hr will prevail.\r\nOn Saturday night and during the daytime on Sunday, 10-20 cm of fresh snow is anticipated. On Sunday the peaks will often be veiled in cloud, intermittent snowfall is anticipated. At high altitudes, a strong NW wind will be blowing (40-50 km/hr) which will slacken off somewhat in the afternoon. Temperatures will drop: at 2000 m to -9 degrees, at 3000 m, -6 degrees.", "avalancheActivityComment": "Avalanche danger is LOW, but in the exposed zones near ridgelines MODERATE. Dangers are focused on steep zones near ridgelines in extended northern aspects (W/N/W) where the fresh drifts can often be easily triggered. Small-to-medium sized slabs are possible.\r\nNaturally triggered shallow loose-snow avalanches (small-sized) in steep terrain and, on grassy slopes, isolated glide-snow avalanches are possible.", "snowpackStructureComment": "The cold fresh snow from Thursday daytime and Thursday night (10-20 cm) will be transported by southerly winds to north-facing ridgeline sectors on Friday. The freshly generated drifts will lie atop cold and loose snow. At low and intermediate altitudes the snow will become superficially moist. The old snow beneath it is relatively compact and evidences no pronounced weak layers. The snowpack is gliding somewhat over the warm, smooth ground." } ] }