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Avalanche bulletin for Sunday, 28 February 2021

In the early morning a favourable avalanche situation will prevail. Increase in danger of wet and gliding avalanches in the course of the day

Edition: Su. 28.02., 08:00 Next update: Su. 28.02., 17:00 Validity

Avalanche bulletin for Sunday, 28 February 2021

In the early morning a favourable avalanche situation will prevail. Increase in danger of wet and gliding avalanches in the course of the day

Edition Sa. 27.02., 17:00 Next update Su. 28.02., 18:00 Validity

Avalanche bulletin for Sunday, 28 February 2021

In the early morning a favourable avalanche situation will prevail. Increase in danger of wet and gliding avalanches in the course of the day

Edition Su. 28.02., 08:00 Next update Su. 28.02., 17:00 Validity

Avalanche bulletin for Sunday, 28 February 2021

In the early morning a favourable avalanche situation will prevail. Increase in danger of wet and gliding avalanches in the course of the day

Edition Su. 28.02., 08:00 Next update Su. 28.02., 17:00 Validity

  
Level 1, low

Dry avalanches: Old snow

In very isolated cases avalanches can be triggered in deep layers of the snowpack and reach medium size. This applies in particular on very steep north facing slopes above approximately 2400 m. Individual avalanche prone locations are to be found in little used terrain and in areas where the snow cover is rather shallow. Very steep north facing slopes are to be traversed by snow sport participants one at a time.

Wet avalanches as day progresses

Danger map Wet

see also snowpack and weather

Level 1, low

Dry avalanches: No distinct avalanche problem

Individual avalanche prone locations for dry avalanches are to be found in particular in extremely steep terrain at high altitude. Restraint should be exercised because avalanches can sweep people along and give rise to falls.

Wet avalanches as day progresses

Danger map Wet

see also snowpack and weather

Level 1, low

Dry avalanches: No distinct avalanche problem

Dry avalanches are not to be expected.

Wet avalanches as day progresses

Danger map Wet

see also snowpack and weather

Level 1, low

Dry avalanches: No distinct avalanche problem

Avalanches can in isolated cases be released in near-surface layers of the snowpack. These avalanche prone locations are to be found especially on extremely steep shady slopes. During the night small wind slabs formed in some localities.
Apart from the danger of being buried, restraint should be exercised as well in view of the danger of avalanches sweeping people along and giving rise to falls.

Wet avalanches as day progresses

Danger map Wet

see also snowpack and weather

Level 1, low

Wet avalanches as day progresses

As a consequence of warming during the day and solar radiation individual gliding avalanches are possible.

Dry avalanches

Danger map Dry

see also snowpack and weather

Level 2, moderate

Wet avalanches as day progresses

As a consequence of warming during the day and solar radiation medium-sized and, in isolated cases, large wet and gliding avalanches are possible. This applies especially on very steep south facing slopes below approximately 2600 m, as well as on east and west facing slopes below approximately 2400 m. Wet avalanches can in some places be released by people.
Backcountry tours should be concluded timely.

Dry avalanches

Danger map Dry

see also snowpack and weather

Level 2, moderate

Wet avalanches as day progresses

As the day progresses individual medium-sized to large gliding avalanches are possible. This applies especially on very steep south facing slopes below approximately 2600 m, as well as on east and west facing slopes below approximately 2400 m.
Caution is to be exercised in areas with glide cracks. Backcountry tours should be concluded timely.

Dry avalanches

Danger map Dry

see also snowpack and weather

Level 2, moderate

Wet avalanches as day progresses

Individual small to medium-sized gliding avalanches are possible. Caution is to be exercised in areas with glide cracks. Backcountry tours should be concluded timely.

Dry avalanches

Danger map Dry

see also snowpack and weather

In the early morning a favourable avalanche situation will prevail. Increase in danger of wet and gliding avalanches in the course of the day
Edition: 27.2.2021, 17:00 / Next update: 28.2.2021, 18:00
Snowpack
The snowpack became thoroughly wet up to nearly 2800 m on very steep south-facing slopes, up to approximately 2200 m on east and west-facing slopes, during the course of the week which has just come to an end. During the nights of clear skies a crust capable of bearing loads will form on steep east-facing, south-facing and west-facing slopes. As a result of daytime warming and solar radiation this crust will soften and the snowpack subsequently will forfeit its stability. During the course of the day, wet-snow and gliding avalanches then become possible on sunny slopes more than anywhere else.
Particularly in Grisons and the Valais, weak layers are evident in the ground level parts of the old snowpack above approximately 2200 to 2400 m in all aspects. During the last few days, however, hardly any avalanches have been triggered in these weak layers. Moreover, stability tests demonstrate that these layers no longer tend towards fracturing or fracture propagation. As a result of the currently lower temperatures, these layers are also no longer being significantly weakened by water penetration and downwards seepage.
Observed weather on Saturday, 27.02.2021
On Friday night on the northern flank of the Alps and in Grisons, skies were predominantly overcast. In the Valais and on the southern flank of the Alps skies were predominantely clear. During the daytime on Saturday in the Valais, on the southern flank of the Alps and in the Engadine, it was generally sunny. In the northern regions, it became increasingly sunny in the mountains as the upper border of high fog descended in altitude.
Fresh snow
-
Temperature
At midday at 2000 m, between +2 °C in the Valais and Ticino and 0 °C on the northern flank of the Alps and in Grisons.
Wind
  • Nocturnal winds in pass areas of the central sector of the Main Alpine Ridge were blowing to some extent at moderate to strong velocity from northerly directions;
  • in the Jura region and in the western sector of the northern flank of the Alps, a bise wind was blowing at moderate to strong velocity;
  • in the other regions of Switzerland, winds were light to moderate, blowing from easterly directions.
Weather forecast through Sunday, 28.02.2021
On Saturday night in the Valais sector of the Main Alpine Ridge and in Ticino, a few centimetres of fresh snow are anticipated. In the morning hours of Sunday, skies will clear up. During the daytime it will be sunny. In the remaining regions of Switzerland nighttime skies will be predominantly clear in the mountains, in the morning hours it will be sunny above the high fog, subsequently generally sunny in the afternoon.
Fresh snow
The snowfall level is expected to descend from approximately 1700 m down to approximately 1000 m. The following amounts of fresh snow are anticipated:
  • in the Upper Valais sector of the Main Alpine Ridge, maximum 5 cm;
  • in the Ticino, just a small amount; elsewhere it will remain dry.
Temperature
At midday at 2000 m, between +3 °C in the northern regions and -2 °C in the southern regions.
Wind
Winds will be easterly,
  • blowing at moderate to strong velocity in parts of the western regions during the nighttime hours;
  • blowing at light strength during the daytime.
Outlook through Tuesday, 02.03.2021
On both days it will be sunny and once again somewhat warmer, including in the southern regions. The danger of dry-snow avalanches will remain low. During the course of each day the danger of wet-snow and gliding avalanches will increase somewhat on sunny slopes.
 

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:

In the early morning a favourable avalanche situation will prevail. Increase in danger of wet and gliding avalanches in the course of the day
Edition: 27.2.2021, 17:00 / Next update: 28.2.2021, 18:00
Snowpack
The snowpack became thoroughly wet up to nearly 2800 m on very steep south-facing slopes, up to approximately 2200 m on east and west-facing slopes, during the course of the week which has just come to an end. During the nights of clear skies a crust capable of bearing loads will form on steep east-facing, south-facing and west-facing slopes. As a result of daytime warming and solar radiation this crust will soften and the snowpack subsequently will forfeit its stability. During the course of the day, wet-snow and gliding avalanches then become possible on sunny slopes more than anywhere else.
Particularly in Grisons and the Valais, weak layers are evident in the ground level parts of the old snowpack above approximately 2200 to 2400 m in all aspects. During the last few days, however, hardly any avalanches have been triggered in these weak layers. Moreover, stability tests demonstrate that these layers no longer tend towards fracturing or fracture propagation. As a result of the currently lower temperatures, these layers are also no longer being significantly weakened by water penetration and downwards seepage.
Observed weather on Saturday, 27.02.2021
On Friday night on the northern flank of the Alps and in Grisons, skies were predominantly overcast. In the Valais and on the southern flank of the Alps skies were predominantely clear. During the daytime on Saturday in the Valais, on the southern flank of the Alps and in the Engadine, it was generally sunny. In the northern regions, it became increasingly sunny in the mountains as the upper border of high fog descended in altitude.
Fresh snow
-
Temperature
At midday at 2000 m, between +2 °C in the Valais and Ticino and 0 °C on the northern flank of the Alps and in Grisons.
Wind
  • Nocturnal winds in pass areas of the central sector of the Main Alpine Ridge were blowing to some extent at moderate to strong velocity from northerly directions;
  • in the Jura region and in the western sector of the northern flank of the Alps, a bise wind was blowing at moderate to strong velocity;
  • in the other regions of Switzerland, winds were light to moderate, blowing from easterly directions.
Weather forecast through Sunday, 28.02.2021
On Saturday night in the Valais sector of the Main Alpine Ridge and in Ticino, a few centimetres of fresh snow are anticipated. In the morning hours of Sunday, skies will clear up. During the daytime it will be sunny. In the remaining regions of Switzerland nighttime skies will be predominantly clear in the mountains, in the morning hours it will be sunny above the high fog, subsequently generally sunny in the afternoon.
Fresh snow
The snowfall level is expected to descend from approximately 1700 m down to approximately 1000 m. The following amounts of fresh snow are anticipated:
  • in the Upper Valais sector of the Main Alpine Ridge, maximum 5 cm;
  • in the Ticino, just a small amount; elsewhere it will remain dry.
Temperature
At midday at 2000 m, between +3 °C in the northern regions and -2 °C in the southern regions.
Wind
Winds will be easterly,
  • blowing at moderate to strong velocity in parts of the western regions during the nighttime hours;
  • blowing at light strength during the daytime.
Outlook through Tuesday, 02.03.2021
On both days it will be sunny and once again somewhat warmer, including in the southern regions. The danger of dry-snow avalanches will remain low. During the course of each day the danger of wet-snow and gliding avalanches will increase somewhat on sunny slopes.

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);
  • by mobile text message (SMS): please send an SMS with the message START SLF SOMMER to the phone number 9234 – you can cancel this service at any time by sending an SMS with the message STOP SLF SOMMER; cost: CHF 0.20 per SMS;
    This SMS service will be discontinued on 31.12.2020. Please use the SLF free mobile app "White Risk".
  • 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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Further information

Print versions of avalanche bulletin

Print-suitable avalanche bulletins, e.g. for a notice board.

 

Measured values

A bevy of data retrievable any time, filtered by station altitude.

Weekly report

An expert analysis of previous week’s avalanche situation.

Submit observation

Your observations can improve avalanche bulletin quality. Reports and photos gratefully accepted.

Destructive avalanches and avalanche accidents

Recent and older avalanche accidents incl. statistical analysis.

White Risk

The SLF free avalanche app. Avalanche bulletin, snow information and more for mobile devices.