With the mild temperatures of the last two weeks, moisture penetration into the snowpack is already well advanced. At present, it is only increasing slowly. North-facing slopes at altitudes between 2200 and 2500 m are most susceptible to moisture penetration. On east- and west-facing slopes, the critical altitudes are somewhat higher, at approximately between 2500 and 2800 m. On south-facing slopes, moisture penetration into the snowpack extends as far as the high alpine regions. It is on these aspects and at these altitudes that isolated large or occasionally also very large wet slab avalanches may be triggered naturally.
In Grisons, the weak layers in the old snowpack are the least deeply buried, and it is here that wet slab avalanches are likely also to be triggered by human activity. Whumpfing sounds continue to be a possible indication of a weak snowpack.
At higher altitudes, where the snowpack is still dry, the weak layers in the old snowpack must continue to be assessed with caution. However, dry avalanches have been rare in recent days.
" }, "source": { "provider": { "name": "SLF", "website": "https://whiterisk.ch/en/conditions" } }, "tendency": [ { "comment": "During the night into Wednesday, it will be cloudy in the far south with some showers, while during the day it will become increasingly sunny. In the north, Wednesday will be mainly sunny after a mostly clear night. The night into Thursday will be clear in many regions. During the day, it will be sunny.
The danger of dry avalanches will not change significantly. The danger of wet avalanches will increase during each day. Off-piste skiing and hut ascents should be completed in good time.
" } ], "unscheduled": false, "validTime": { "startTime": "2026-04-20T15:00:00+00:00", "endTime": "2026-04-21T15:00:00+00:00" }, "weatherForecast": { "comment": "The night into Tuesday will be mostly clear despite some clouds, with partly cloudy conditions in the northeast. During the day, it will be mostly sunny. On the central and eastern northern flank of the Alps and in the Pr\u00e4ttigau, it will be cloudy.
-
At midday at 2000 m, between +4 \u00b0C in the southwest and -2 \u00b0C in the northeast
Light to moderate from westerly directions
" }, "weatherReview": { "comment": "During the first half of the night, the last precipitation fell in the northeast and in the south. During the day, it was mostly sunny in the west and south, and partly cloudy in the northeast.
A few centimetres locally above approximately 2400 m
At midday at 2000 m, between +5 \u00b0C in the southwest and 0 \u00b0C in the northeast
Moderate during the night, mostly light during the day from westerly directions
" } }, { "avalancheProblems": [ { "customData": { "CH": { "subdivision": "minus", "coreZoneText": "Danger level \"moderate\" (2-) in northwest to north to northeast facing aspects above 2600m." } }, "problemType": "persistent_weak_layers", "aspects": [ "N", "NE", "NW" ], "comment": "Dry avalanches can be released in the old snowpack and reach medium size. The avalanche prone locations are rare but are barely recognisable, even to the trained eye. Caution is to be exercised on steep, rather lightly snow-covered shady slopes in little used backcountry terrain.With the mild temperatures of the last two weeks, moisture penetration into the snowpack is already well advanced. At present, it is only increasing slowly. North-facing slopes at altitudes between 2200 and 2500 m are most susceptible to moisture penetration. On east- and west-facing slopes, the critical altitudes are somewhat higher, at approximately between 2500 and 2800 m. On south-facing slopes, moisture penetration into the snowpack extends as far as the high alpine regions. It is on these aspects and at these altitudes that isolated large or occasionally also very large wet slab avalanches may be triggered naturally.
In Grisons, the weak layers in the old snowpack are the least deeply buried, and it is here that wet slab avalanches are likely also to be triggered by human activity. Whumpfing sounds continue to be a possible indication of a weak snowpack.
At higher altitudes, where the snowpack is still dry, the weak layers in the old snowpack must continue to be assessed with caution. However, dry avalanches have been rare in recent days.
" }, "source": { "provider": { "name": "SLF", "website": "https://whiterisk.ch/en/conditions" } }, "tendency": [ { "comment": "During the night into Wednesday, it will be cloudy in the far south with some showers, while during the day it will become increasingly sunny. In the north, Wednesday will be mainly sunny after a mostly clear night. The night into Thursday will be clear in many regions. During the day, it will be sunny.
The danger of dry avalanches will not change significantly. The danger of wet avalanches will increase during each day. Off-piste skiing and hut ascents should be completed in good time.
" } ], "unscheduled": false, "validTime": { "startTime": "2026-04-20T15:00:00+00:00", "endTime": "2026-04-21T15:00:00+00:00" }, "weatherForecast": { "comment": "The night into Tuesday will be mostly clear despite some clouds, with partly cloudy conditions in the northeast. During the day, it will be mostly sunny. On the central and eastern northern flank of the Alps and in the Pr\u00e4ttigau, it will be cloudy.
-
At midday at 2000 m, between +4 \u00b0C in the southwest and -2 \u00b0C in the northeast
Light to moderate from westerly directions
" }, "weatherReview": { "comment": "During the first half of the night, the last precipitation fell in the northeast and in the south. During the day, it was mostly sunny in the west and south, and partly cloudy in the northeast.
A few centimetres locally above approximately 2400 m
At midday at 2000 m, between +5 \u00b0C in the southwest and 0 \u00b0C in the northeast
Moderate during the night, mostly light during the day from westerly directions
" } }, { "avalancheProblems": [ { "customData": { "CH": { "subdivision": "minus", "coreZoneText": "Danger level \"moderate\" (2-) in northwest to north to northeast facing aspects above 2600m." } }, "problemType": "persistent_weak_layers", "aspects": [ "N", "NE", "NW" ], "comment": "Dry avalanches can be released in the old snowpack and reach medium size. The avalanche prone locations are rare but are barely recognisable, even to the trained eye. Caution is to be exercised on steep, rather lightly snow-covered shady slopes in little used backcountry terrain.With the mild temperatures of the last two weeks, moisture penetration into the snowpack is already well advanced. At present, it is only increasing slowly. North-facing slopes at altitudes between 2200 and 2500 m are most susceptible to moisture penetration. On east- and west-facing slopes, the critical altitudes are somewhat higher, at approximately between 2500 and 2800 m. On south-facing slopes, moisture penetration into the snowpack extends as far as the high alpine regions. It is on these aspects and at these altitudes that isolated large or occasionally also very large wet slab avalanches may be triggered naturally.
In Grisons, the weak layers in the old snowpack are the least deeply buried, and it is here that wet slab avalanches are likely also to be triggered by human activity. Whumpfing sounds continue to be a possible indication of a weak snowpack.
At higher altitudes, where the snowpack is still dry, the weak layers in the old snowpack must continue to be assessed with caution. However, dry avalanches have been rare in recent days.
" }, "source": { "provider": { "name": "SLF", "website": "https://whiterisk.ch/en/conditions" } }, "tendency": [ { "comment": "During the night into Wednesday, it will be cloudy in the far south with some showers, while during the day it will become increasingly sunny. In the north, Wednesday will be mainly sunny after a mostly clear night. The night into Thursday will be clear in many regions. During the day, it will be sunny.
The danger of dry avalanches will not change significantly. The danger of wet avalanches will increase during each day. Off-piste skiing and hut ascents should be completed in good time.
" } ], "unscheduled": false, "validTime": { "startTime": "2026-04-20T15:00:00+00:00", "endTime": "2026-04-21T15:00:00+00:00" }, "weatherForecast": { "comment": "The night into Tuesday will be mostly clear despite some clouds, with partly cloudy conditions in the northeast. During the day, it will be mostly sunny. On the central and eastern northern flank of the Alps and in the Pr\u00e4ttigau, it will be cloudy.
-
At midday at 2000 m, between +4 \u00b0C in the southwest and -2 \u00b0C in the northeast
Light to moderate from westerly directions
" }, "weatherReview": { "comment": "During the first half of the night, the last precipitation fell in the northeast and in the south. During the day, it was mostly sunny in the west and south, and partly cloudy in the northeast.
A few centimetres locally above approximately 2400 m
At midday at 2000 m, between +5 \u00b0C in the southwest and 0 \u00b0C in the northeast
Moderate during the night, mostly light during the day from westerly directions
" } }, { "avalancheProblems": [ { "customData": { "CH": { "subdivision": null, "coreZoneText": "Danger level \"low\" (1) in southwest to north to southeast facing aspects above 2200m." } }, "problemType": "no_distinct_avalanche_problem", "aspects": [ "N", "NE", "E", "SE", "SW", "W", "NW" ], "comment": "Individual avalanche prone locations for dry avalanches are to be found in particular on very steep shady slopes. In addition small wind slabs formed in high Alpine regions. These are to be evaluated with care and prudence in extreme terrain.With the mild temperatures of the last two weeks, moisture penetration into the snowpack is already well advanced. At present, it is only increasing slowly. North-facing slopes at altitudes between 2200 and 2500 m are most susceptible to moisture penetration. On east- and west-facing slopes, the critical altitudes are somewhat higher, at approximately between 2500 and 2800 m. On south-facing slopes, moisture penetration into the snowpack extends as far as the high alpine regions. It is on these aspects and at these altitudes that isolated large or occasionally also very large wet slab avalanches may be triggered naturally.
In Grisons, the weak layers in the old snowpack are the least deeply buried, and it is here that wet slab avalanches are likely also to be triggered by human activity. Whumpfing sounds continue to be a possible indication of a weak snowpack.
At higher altitudes, where the snowpack is still dry, the weak layers in the old snowpack must continue to be assessed with caution. However, dry avalanches have been rare in recent days.
" }, "source": { "provider": { "name": "SLF", "website": "https://whiterisk.ch/en/conditions" } }, "tendency": [ { "comment": "During the night into Wednesday, it will be cloudy in the far south with some showers, while during the day it will become increasingly sunny. In the north, Wednesday will be mainly sunny after a mostly clear night. The night into Thursday will be clear in many regions. During the day, it will be sunny.
The danger of dry avalanches will not change significantly. The danger of wet avalanches will increase during each day. Off-piste skiing and hut ascents should be completed in good time.
" } ], "unscheduled": false, "validTime": { "startTime": "2026-04-20T15:00:00+00:00", "endTime": "2026-04-21T15:00:00+00:00" }, "weatherForecast": { "comment": "The night into Tuesday will be mostly clear despite some clouds, with partly cloudy conditions in the northeast. During the day, it will be mostly sunny. On the central and eastern northern flank of the Alps and in the Pr\u00e4ttigau, it will be cloudy.
-
At midday at 2000 m, between +4 \u00b0C in the southwest and -2 \u00b0C in the northeast
Light to moderate from westerly directions
" }, "weatherReview": { "comment": "During the first half of the night, the last precipitation fell in the northeast and in the south. During the day, it was mostly sunny in the west and south, and partly cloudy in the northeast.
A few centimetres locally above approximately 2400 m
At midday at 2000 m, between +5 \u00b0C in the southwest and 0 \u00b0C in the northeast
Moderate during the night, mostly light during the day from westerly directions
" } }, { "avalancheProblems": [ { "customData": { "CH": { "subdivision": null, "coreZoneText": "Danger level \"low\" (1) in southwest to north to southeast facing aspects above 2200m." } }, "problemType": "no_distinct_avalanche_problem", "aspects": [ "N", "NE", "E", "SE", "SW", "W", "NW" ], "comment": "Individual avalanche prone locations for dry avalanches are to be found in particular on very steep shady slopes. In addition small wind slabs formed in high Alpine regions. These are to be evaluated with care and prudence in extreme terrain.With the mild temperatures of the last two weeks, moisture penetration into the snowpack is already well advanced. At present, it is only increasing slowly. North-facing slopes at altitudes between 2200 and 2500 m are most susceptible to moisture penetration. On east- and west-facing slopes, the critical altitudes are somewhat higher, at approximately between 2500 and 2800 m. On south-facing slopes, moisture penetration into the snowpack extends as far as the high alpine regions. It is on these aspects and at these altitudes that isolated large or occasionally also very large wet slab avalanches may be triggered naturally.
In Grisons, the weak layers in the old snowpack are the least deeply buried, and it is here that wet slab avalanches are likely also to be triggered by human activity. Whumpfing sounds continue to be a possible indication of a weak snowpack.
At higher altitudes, where the snowpack is still dry, the weak layers in the old snowpack must continue to be assessed with caution. However, dry avalanches have been rare in recent days.
" }, "source": { "provider": { "name": "SLF", "website": "https://whiterisk.ch/en/conditions" } }, "tendency": [ { "comment": "During the night into Wednesday, it will be cloudy in the far south with some showers, while during the day it will become increasingly sunny. In the north, Wednesday will be mainly sunny after a mostly clear night. The night into Thursday will be clear in many regions. During the day, it will be sunny.
The danger of dry avalanches will not change significantly. The danger of wet avalanches will increase during each day. Off-piste skiing and hut ascents should be completed in good time.
" } ], "unscheduled": false, "validTime": { "startTime": "2026-04-20T15:00:00+00:00", "endTime": "2026-04-21T15:00:00+00:00" }, "weatherForecast": { "comment": "The night into Tuesday will be mostly clear despite some clouds, with partly cloudy conditions in the northeast. During the day, it will be mostly sunny. On the central and eastern northern flank of the Alps and in the Pr\u00e4ttigau, it will be cloudy.
-
At midday at 2000 m, between +4 \u00b0C in the southwest and -2 \u00b0C in the northeast
Light to moderate from westerly directions
" }, "weatherReview": { "comment": "During the first half of the night, the last precipitation fell in the northeast and in the south. During the day, it was mostly sunny in the west and south, and partly cloudy in the northeast.
A few centimetres locally above approximately 2400 m
At midday at 2000 m, between +5 \u00b0C in the southwest and 0 \u00b0C in the northeast
Moderate during the night, mostly light during the day from westerly directions
" } }, { "avalancheProblems": [ { "customData": { "CH": { "subdivision": null } }, "problemType": "wet_snow", "comment": "The early morning will see favourable conditions. As a consequence of warming during the day and solar radiation individual wet and gliding avalanches are possible. Restraint should be exercised because avalanches can sweep people along and give rise to falls.", "dangerRatingValue": "low", "validTimePeriod": "all_day" }, { "customData": { "CH": { "subdivision": null } }, "problemType": "gliding_snow", "comment": "The early morning will see favourable conditions. As a consequence of warming during the day and solar radiation individual wet and gliding avalanches are possible. Restraint should be exercised because avalanches can sweep people along and give rise to falls.", "dangerRatingValue": "low", "validTimePeriod": "all_day" } ], "bulletinID": "1642048f-53b6-4383-a537-e84ef9ec0083", "customData": { "CH": { "aggregation": [ { "category": "wet", "validTimePeriod": "all_day", "problemTypes": [ "wet_snow", "gliding_snow" ] } ] }, "ALBINA": { "mainDate": "2026-04-21" } }, "dangerRatings": [ { "mainValue": "low", "validTimePeriod": "all_day", "customData": { "CH": { "subdivision": null } } } ], "lang": "en", "nextUpdate": "2026-04-21T15:00:00+00:00", "publicationTime": "2026-04-20T15:00:00+00:00", "regions": [ { "regionID": "CH-1311", "name": "Vouvry" }, { "regionID": "CH-1213", "name": "Hohgant" }, { "regionID": "CH-6131", "name": "Luganese" }, { "regionID": "CH-3111", "name": "Glarus Nord" }, { "regionID": "CH-2132", "name": "Ybrig" }, { "regionID": "CH-2111", "name": "Pilatus" }, { "regionID": "CH-2121", "name": "Glaubenberg" }, { "regionID": "CH-1221", "name": "Niedersimmental" }, { "regionID": "CH-1121", "name": "Jaun" }, { "regionID": "CH-2133", "name": "Stoos" }, { "regionID": "CH-3221", "name": "Toggenburg" }, { "regionID": "CH-2124", "name": "Gersau" }, { "regionID": "CH-1111", "name": "Waadtl\u00e4nder Voralpen" }, { "regionID": "CH-1113", "name": "Aigle-Leysin" } ], "snowpackStructure": { "comment": "With the mild temperatures of the last two weeks, moisture penetration into the snowpack is already well advanced. At present, it is only increasing slowly. North-facing slopes at altitudes between 2200 and 2500 m are most susceptible to moisture penetration. On east- and west-facing slopes, the critical altitudes are somewhat higher, at approximately between 2500 and 2800 m. On south-facing slopes, moisture penetration into the snowpack extends as far as the high alpine regions. It is on these aspects and at these altitudes that isolated large or occasionally also very large wet slab avalanches may be triggered naturally.
In Grisons, the weak layers in the old snowpack are the least deeply buried, and it is here that wet slab avalanches are likely also to be triggered by human activity. Whumpfing sounds continue to be a possible indication of a weak snowpack.
At higher altitudes, where the snowpack is still dry, the weak layers in the old snowpack must continue to be assessed with caution. However, dry avalanches have been rare in recent days.
" }, "source": { "provider": { "name": "SLF", "website": "https://whiterisk.ch/en/conditions" } }, "tendency": [ { "comment": "During the night into Wednesday, it will be cloudy in the far south with some showers, while during the day it will become increasingly sunny. In the north, Wednesday will be mainly sunny after a mostly clear night. The night into Thursday will be clear in many regions. During the day, it will be sunny.
The danger of dry avalanches will not change significantly. The danger of wet avalanches will increase during each day. Off-piste skiing and hut ascents should be completed in good time.
" } ], "unscheduled": false, "validTime": { "startTime": "2026-04-20T15:00:00+00:00", "endTime": "2026-04-21T15:00:00+00:00" }, "weatherForecast": { "comment": "The night into Tuesday will be mostly clear despite some clouds, with partly cloudy conditions in the northeast. During the day, it will be mostly sunny. On the central and eastern northern flank of the Alps and in the Pr\u00e4ttigau, it will be cloudy.
-
At midday at 2000 m, between +4 \u00b0C in the southwest and -2 \u00b0C in the northeast
Light to moderate from westerly directions
" }, "weatherReview": { "comment": "During the first half of the night, the last precipitation fell in the northeast and in the south. During the day, it was mostly sunny in the west and south, and partly cloudy in the northeast.
A few centimetres locally above approximately 2400 m
At midday at 2000 m, between +5 \u00b0C in the southwest and 0 \u00b0C in the northeast
Moderate during the night, mostly light during the day from westerly directions
" } } ], "customData": { "CH": { "base": "be7af0b8-a173-4d21-b7cc-a1a3292e5ca1:274" } } }