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Avalanche bulletin through Saturday, 8 May 2021

Considerable danger of dry and wet avalanches will be encountered in some regions

Edition: Fr. 07.05., 17:00 Next update: Sa. 08.05., 17:00 Validity

Avalanche bulletin through Saturday, 8 May 2021

Considerable danger of dry and wet avalanches will be encountered in some regions

Edition Fr. 07.05., 17:00 Next update Sa. 08.05., 18:00 Validity

Avalanche bulletin through Saturday, 8 May 2021

Considerable danger of dry and wet avalanches will be encountered in some regions

Edition Fr. 07.05., 17:00 Next update Sa. 08.05., 17:00 Validity

Avalanche bulletin through Saturday, 8 May 2021

Considerable danger of dry and wet avalanches will be encountered in some regions

Edition Fr. 07.05., 17:00 Next update Sa. 08.05., 17:00 Validity

  
Level 3, considerable

New snow

Avalanche prone locations
In all aspects at all altitudes.

In all aspects at all altitudes.

Danger description

The avalanche prone locations for dry avalanches are to be found in particular on west, north and east facing slopes above approximately 2400 m. Avalanches can be released by a single winter sport participant and reach dangerously large size. As a consequence of warming during the day and the solar radiation, the likelihood of dry avalanches being released will increase.
Ski touring calls for experience in the assessment of avalanche danger.

Wet avalanches as day progresses

The danger of wet avalanches will increase during the day, reaching danger level 3 (considerable). As a consequence of warming during the day and solar radiation numerous wet avalanches are to be expected, even large ones in isolated cases. This applies on east, south and west facing slopes in all altitude zones, as well as on north facing slopes below approximately 3000 m. Backcountry tours should be started early and concluded timely.

see also snowpack and weather

Level 2, moderate

Wind slabs

Avalanche prone locations
In particular in west to north to south facing aspects above approximately 2400m.

In particular in west to north to south facing aspects above approximately 2400m.

Danger description

Fresh and older wind slabs are to be evaluated with care and prudence in steep terrain. They are mostly small but in some cases prone to triggering. In high Alpine regions the avalanche prone locations are more prevalent and the danger is greater.
Apart from the danger of being buried, restraint should be exercised in particular in view of the danger of avalanches sweeping people along and giving rise to falls.

Wet avalanches as day progresses

As a consequence of warming during the day and solar radiation wet loose snow avalanches are to be expected, even medium-sized ones.

see also snowpack and weather

Level 1, low

Wet avalanches

Only a little snow is lying. On north facing slopes individual gliding avalanches and moist snow slides are possible.

see also snowpack and weather

Level 2, moderate

Wind slabs

Avalanche prone locations
In particular in west to north to south facing aspects above approximately 2200m.

In particular in west to north to south facing aspects above approximately 2200m.

Danger description

Fresh and older wind slabs are to be evaluated with care and prudence in steep terrain. They are rather small but in some cases prone to triggering. In high Alpine regions the avalanche prone locations are more prevalent and the danger is greater.
Careful route selection is recommended.

Wet avalanches as day progresses

As a consequence of warming during the day and solar radiation wet loose snow avalanches are to be expected, even medium-sized ones.

see also snowpack and weather

Level 3, considerable

New snow

Avalanche prone locations
In all aspects at all altitudes.

In all aspects at all altitudes.

Danger description

The avalanche prone locations for dry avalanches are to be found in all aspects above approximately 2200 m. Avalanches can be released by a single winter sport participant and reach large size. As a consequence of warming during the day and the solar radiation, the likelihood of dry avalanches being released will increase.
Ski touring calls for experience in the assessment of avalanche danger and restraint.

Wet avalanches as day progresses

The danger of wet avalanches will increase during the day, reaching danger level 3 (considerable). As a consequence of warming during the day and solar radiation numerous wet avalanches are to be expected, even large ones. This applies on east, south and west facing slopes in all altitude zones, as well as on north facing slopes below approximately 3000 m. Exposed parts of transportation routes can be endangered.

see also snowpack and weather

Level 2, moderate

Wind slabs

Avalanche prone locations
In particular in west to north to southeast facing aspects above approximately 2000m.

In particular in west to north to southeast facing aspects above approximately 2000m.

Danger description

The wind slabs of Friday are in some cases prone to triggering. 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.

Wet avalanches as day progresses

In all aspects wet loose snow avalanches are to be expected as a consequence of warming during the day and solar radiation. These can reach medium size.

see also snowpack and weather

Considerable danger of dry and wet avalanches will be encountered in some regions
Edition: 7.5.2021, 17:00 / Next update: 8.5.2021, 18:00
Snowpack
The layers of fresh fallen snow and freshly generated snowdrift accumulations from Friday are prone to triggering in places. In the northern and western regions these drifts are deep, in the other regions of Switzerland relatively shallow. As a result of solar radiation and significant warming, numerous wet-snow avalanches can be expected to release from the fresh snow, beginning on sun-drenched slopes before anywhere else, subsequently also on north-facing slopes during the course of the day.
Observed weather on Friday, 07.05.2021
In the northern regions and in the Valais, there was frequent snowfall registered. The snowfall level lay between 1400 and 1700 m. During the course of the day the snowfall slackened off. In the southern regions there was only a small amount of fresh snow falling above 1800 m during the nighttime hours. During the daytime it was quite sunny.
Fresh snow
Between early Thursday morning and Friday afternoon, the following amounts of fresh snow were registered above approximately 2200 m:
  • furthermost western part of Lower Valais, northern Valais: 50 to 80 cm;
  • remaining parts of Lower Valais, Vaud Alps, eastern part of Bernese Oberland: 30 to 50 cm;
  • remaining parts of the northern flank of the Alps, remaining parts of Valais not including upper valleys of Visp: 15 to 30 cm;
  • upper valleys of Visp, Bedretto valley, northern Grisons: 5 to 15 cm;
  • in the other regions of Switzerland, only a few centimetres; in the furthermost south it remained dry.
Temperature
At midday at 2000 m, between -2 °C in the northern regions and +4 °C in the Ticino.
Wind
Winds were blowing at moderate to strong velocity,
  • during the nighttime hours from southwesterly directions;
  • during the daytime from the northwest.
Weather forecast through Saturday, 08.05.2021
Following a night of clear skies it is expected to be rather sunny. During the course of the day it will become significantly warmer.
Fresh snow
-
Temperature
At midday at 2000 m, between +6 °C in the western regions and +3 °C in the eastern and southern regions. During the afternoon, temperatures will continue to rise.
Wind
Winds will be predominantly light, in the high alpine regions blowing at moderate strength from southwesterly directions.
Outlook through Monday, 10.05.2021
Sunday
Following a night of clear skies it will be warm and quite sunny. The zero-degree level will lie at 3500 m. During the course of the day, clouds will move into southern regions. At elevated altitudes an increasingly strong-to-storm velocity southwesterly wind will be blowing; in the Alpine valleys, foehn wind will prevail. Dry-snow avalanches can be triggered at high altitudes on very steep north-facing slopes more than anywhere else. During the course of the day, numerous wet-snow avalanches can be expected, in particular on sun-drenched slopes up to the high alpine regions, and on north-facing slopes below approximately 2500 m more than anywhere else.
Monday
In the southern regions, snowfall is anticipated above approximately 2400 m. In the northern regions, skies will be bright as a result of foehn influence. A storm-strength southerly wind will be blowing. Avalanche danger levels are expected to increase in the southern regions as a result of fresh snow. In the remaining regions of Switzerland, the main danger will be freshly generated snowdrift accumulations in high alpine regions. As a result of higher temperatures, wet-snow avalanches continue to be expected at intermediate and high altitudes.
 

Your observations can improve the quality of the avalanche bulletin. We are very grateful for any reports and photos received.

Please report your observations of avalanches or alarm signs, or your estimation of the avalanche danger, or simply send us a picture illustrating the current situation. Your report from the field will be considered along with all the other information when we assess the avalanche danger. It is impossible, however, to reflect the exact content of each individual report in the avalanche bulletin.

The best way to file a report is by completing the interactive form on this page. If your report is to be used in the 5 pm avalanche bulletin, it should be submitted before 2:30 pm if possible. Reports received later will normally be given consideration in the next assessment.

Other reporting options:

Considerable danger of dry and wet avalanches will be encountered in some regions
Edition: 7.5.2021, 17:00 / Next update: 8.5.2021, 18:00
Snowpack
The layers of fresh fallen snow and freshly generated snowdrift accumulations from Friday are prone to triggering in places. In the northern and western regions these drifts are deep, in the other regions of Switzerland relatively shallow. As a result of solar radiation and significant warming, numerous wet-snow avalanches can be expected to release from the fresh snow, beginning on sun-drenched slopes before anywhere else, subsequently also on north-facing slopes during the course of the day.
Observed weather on Friday, 07.05.2021
In the northern regions and in the Valais, there was frequent snowfall registered. The snowfall level lay between 1400 and 1700 m. During the course of the day the snowfall slackened off. In the southern regions there was only a small amount of fresh snow falling above 1800 m during the nighttime hours. During the daytime it was quite sunny.
Fresh snow
Between early Thursday morning and Friday afternoon, the following amounts of fresh snow were registered above approximately 2200 m:
  • furthermost western part of Lower Valais, northern Valais: 50 to 80 cm;
  • remaining parts of Lower Valais, Vaud Alps, eastern part of Bernese Oberland: 30 to 50 cm;
  • remaining parts of the northern flank of the Alps, remaining parts of Valais not including upper valleys of Visp: 15 to 30 cm;
  • upper valleys of Visp, Bedretto valley, northern Grisons: 5 to 15 cm;
  • in the other regions of Switzerland, only a few centimetres; in the furthermost south it remained dry.
Temperature
At midday at 2000 m, between -2 °C in the northern regions and +4 °C in the Ticino.
Wind
Winds were blowing at moderate to strong velocity,
  • during the nighttime hours from southwesterly directions;
  • during the daytime from the northwest.
Weather forecast through Saturday, 08.05.2021
Following a night of clear skies it is expected to be rather sunny. During the course of the day it will become significantly warmer.
Fresh snow
-
Temperature
At midday at 2000 m, between +6 °C in the western regions and +3 °C in the eastern and southern regions. During the afternoon, temperatures will continue to rise.
Wind
Winds will be predominantly light, in the high alpine regions blowing at moderate strength from southwesterly directions.
Outlook through Monday, 10.05.2021
Sunday
Following a night of clear skies it will be warm and quite sunny. The zero-degree level will lie at 3500 m. During the course of the day, clouds will move into southern regions. At elevated altitudes an increasingly strong-to-storm velocity southwesterly wind will be blowing; in the Alpine valleys, foehn wind will prevail. Dry-snow avalanches can be triggered at high altitudes on very steep north-facing slopes more than anywhere else. During the course of the day, numerous wet-snow avalanches can be expected, in particular on sun-drenched slopes up to the high alpine regions, and on north-facing slopes below approximately 2500 m more than anywhere else.
Monday
In the southern regions, snowfall is anticipated above approximately 2400 m. In the northern regions, skies will be bright as a result of foehn influence. A storm-strength southerly wind will be blowing. Avalanche danger levels are expected to increase in the southern regions as a result of fresh snow. In the remaining regions of Switzerland, the main danger will be freshly generated snowdrift accumulations in high alpine regions. As a result of higher temperatures, wet-snow avalanches continue to be expected at intermediate and high altitudes.

Latest avalanche bulletins

 

Have you observed alarm signs or an avalanche?

Your observations can improve the quality of the avalanche bulletin. We are very grateful for any reports and photos received.

interactive Button 'submit your observation'

 

More information about observations

Please report your observations of avalanches or alarm signs, or your estimation of the avalanche danger, or simply send us a picture illustrating the current situation. Your report from the field will be considered along with all the other information when we assess the avalanche danger. It is impossible, however, to reflect the exact content of each individual report in the avalanche bulletin.

The best way to file a report is by completing the interactive form on this page. If your report is to be used in the 5 pm avalanche bulletin, it should be submitted before 2:30 pm if possible. Reports received later will normally be given consideration in the next assessment.

Other reporting options:

 

No avalanche bulletins are being published at the moment. Nevertheless, you should still stay up to date with the avalanche situation in the mountains, especially if there is fresh snow.

However, the SLF will, by way of exception, also issue avalanche bulletins in the summer in case of heavy snowfall. There are different ways you can be notified when these bulletins based on the snow situation are published:

  • by push alert on SLF's free White Risk mobile app: appearing in four languages (English, German, French and Italian), this can be downloaded from iTunes App Store (for iPhones) or Google Play Store (for Android);
  • via an RSS feed which informs you whenever an avalanche bulletin is published.

Depending on the snow and avalanche situation, the regular publication of avalanche bulletin recommences in November/December.

Latest avalanche bulletins

 

Have you observed alarm signs or an avalanche?

Your observations can improve the quality of the avalanche bulletin. We are very grateful for any reports and photos received.

interactive Button 'submit your observation'

 

More information about observations

Please report your observations of avalanches or alarm signs, or your estimation of the avalanche danger, or simply send us a picture illustrating the current situation. Your report from the field will be considered along with all the other information when we assess the avalanche danger. It is impossible, however, to reflect the exact content of each individual report in the avalanche bulletin.

The best way to file a report is by completing the interactive form on this page. If your report is to be used in the 5 pm avalanche bulletin, it should be submitted before 2:30 pm if possible. Reports received later will normally be given consideration in the next assessment.

Other reporting options:

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