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Avalanche bulletin through Monday, 6 December 2021

Considerable avalanche danger will be encountered over a wide area

Edition: Su. 05.12., 17:00 Next update: Mo. 06.12., 17:00 Validity

Avalanche bulletin through Monday, 6 December 2021

Considerable avalanche danger will be encountered over a wide area

Edition Su. 05.12., 17:00 Next update Mo. 06.12., 18:00 Validity

Avalanche bulletin through Monday, 6 December 2021

Considerable avalanche danger will be encountered over a wide area

Edition Su. 05.12., 17:00 Next update Mo. 06.12., 17:00 Validity

Avalanche bulletin through Monday, 6 December 2021

Considerable avalanche danger will be encountered over a wide area

Edition Su. 05.12., 17:00 Next update Mo. 06.12., 17:00 Validity

 
Level 2, moderate

Old snow

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

Avalanches can in isolated cases be released in deeper layers. They can reach medium size. Careful route selection is recommended.

see also snowpack and weather

Level 3, considerable

New snow, old snow

Avalanche prone locations
In all aspects above approximately 1800m.

In all aspects above approximately 1800m.

Danger description

The large quantity of fresh snow of the last few days and the wind slabs are lying on top of a weakly bonded old snowpack. Single winter sport participants can release avalanches in some places. Remotely triggered avalanches are possible.
Avalanches can be triggered in near-ground layers and reach large size. This applies especially on west, north and east facing slopes above approximately 2000 m.
Backcountry touring and other off-piste activities call for experience in the assessment of avalanche danger and caution.

Gliding avalanches

Below approximately 2000 m medium-sized gliding avalanches are possible.

see also snowpack and weather

Level 3, considerable

Old snow

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

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

Danger description

The new snow and wind slabs are lying on top of a weakly bonded old snowpack. Avalanches can be released by a single winter sport participant and reach medium size. Experience in the assessment of avalanche danger is important.

see also snowpack and weather

Level 3, considerable

Old snow

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

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

Danger description

The new snow and wind slabs are lying on top of a weakly bonded old snowpack. Avalanches can be released, even by a single winter sport participant. Remotely triggered avalanches are possible. Whumpfing sounds and the formation of shooting cracks when stepping on the snowpack serve as an alarm indicating the danger. Avalanches can be triggered in near-ground layers and reach large size.
Defensive route selection is important.

see also snowpack and weather

Level 2, moderate

No distinct avalanche problem

Avalanche prone locations
In particular in west to north to southeast facing aspects above approximately 1400m.

In particular in west to north to southeast facing aspects above approximately 1400m.

Danger description

A generally favourable avalanche situation will prevail. Individual avalanche prone locations are to be found in particular on very steep slopes. 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. Careful route selection is recommended.

see also snowpack and weather

Considerable avalanche danger will be encountered over a wide area
Edition: 5.12.2021, 17:00 / Next update: 6.12.2021, 18:00
Snowpack
During the last 8 days in the northern and the furthermost western regions there has been 150 to 200 cm of fresh snow registered over widespread areas, in the other regions 40 to 100 cm widespread. The fresh fallen snow and freshly generated snowdrift accumulations from this period were deposited on top of a thin, soft old snowpack with expansively metamorphosed (faceted) snow crystals. Thus, the snowpack layering is unfavourable above 2000 m on west-facing, north-facing and east-facing slopes in particular. Most of the avalanches which have released in the last few days fractured in this weak old snow.
In many places in the northern and the furthermost western regions there was a small amount of rainfall up to 1500 to 2000 m on Saturday.
Observed weather on Sunday, 05.12.2021
On Saturday evening the snowfall level descended down to low lying areas. On Saturday night the intensive snowfall came to an end, subsequently there were only isolated showers. During the course of the day on Sunday it turned quite sunny in the southern Upper Valais, in central Grisons and in the Upper Engadine; in the other regions of Switzerland skies remained overcast. In the furthermost southern regions it was dry and sunny during the day.
Fresh snow
Between Saturday afternoon and Sunday afternoon, the following amounts of fresh snow were registered above 2000 m:
  • western and central sectors of the northern flank of the Alps, northern and western parts of Lower Valais: 20 to 40 cm;
  • in the other regions of Switzerland, up to 20 cm over widespread areas; in the furthermost southern regions it was dry.
Thus, since Friday the following overall amounts of fresh snow have been registered above 2000 m:
  • northern flank of the Alps west of the Blüemlisalp, furthermost western part of Lower Valais: 60 to 80 cm, as much as 100 m along the French border;
  • remaining regions of the northern flank of the Alps and of northern Valais: 40 to 60 cm;
  • remaining parts of southern Valais, Grisons north of the Anterior Rhine: 20 to 40 cm; in the other regions, less.
About 40 cm of moist fresh snow was registered on the highest summits of the Jura region.
Temperature
At midday at 2000 m, between -9 °C in the northern regions and -6 °C in the southern regions.
Wind
  • During the nocturnal hours winds will be blowing at strong velocity in some places, from westerly to northwesterly directions;
  • during the daytime, winds will be blowing at light to moderate strength in the mountains.
Weather forecast through Monday, 06.12.2021
During the night, a few centimetres of snowfall is expected over widespread areas, falling down to low lying area. On Monday it will become increasingly sunny from the west, except on the northern flank of the Alps and in northern Grisons. In the southern regions it is expected to remain dry and the day will be sunny.
Fresh snow
  • On Sunday night, a few centimetres of fresh snow is anticipated over widespread areas;
  • in the southern regions and the Engadine it will remain dry.
Temperature
At midday at 2000 m, -9 °C in the northern regions and -6 °C in the southern regions.
Wind
Winds will be blowing at light to moderate strength from northerly directions, blowing from westerly directions in the Prealps.
Outlook through Wednesday, 08.12.2021
Tuesday
On Monday night, 5 to 10 cm of fresh snow falling down to low lying areas is anticipated over widespread areas. Starting at midday it will turn increasingly sunny from the west. In the southern regions it will be dry and the day will be quite sunny. The northwesterly winds will be blowing intermittently at moderate to strong velocity.
In the northern and the western regions, small snowdrift accumulations which will be prone to triggering are expected to form at high altitudes. Otherwise the avalanche danger levels will decrease on the northern flank of the Alps and in the furthermost western part of Lower Valais. In the other regions of Switzerland, avalanche danger levels are not expected to change significantly.
Wednesday
On Tuesday night precipitation will set in, and on Wednesday is expected to intensify during the course of the day. In the valleys of the north, foehn influence will still be felt in the early morning hours, elsewhere a temporarily strong-velocity southwesterly wind will be blowing.
In the western regions, avalanche danger levels are expected to increase. Also in the remaining regions of Switzerland, a slight increase in danger levels is possible.
 

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 avalanche danger will be encountered over a wide area
Edition: 5.12.2021, 17:00 / Next update: 6.12.2021, 18:00
Snowpack
During the last 8 days in the northern and the furthermost western regions there has been 150 to 200 cm of fresh snow registered over widespread areas, in the other regions 40 to 100 cm widespread. The fresh fallen snow and freshly generated snowdrift accumulations from this period were deposited on top of a thin, soft old snowpack with expansively metamorphosed (faceted) snow crystals. Thus, the snowpack layering is unfavourable above 2000 m on west-facing, north-facing and east-facing slopes in particular. Most of the avalanches which have released in the last few days fractured in this weak old snow.
In many places in the northern and the furthermost western regions there was a small amount of rainfall up to 1500 to 2000 m on Saturday.
Observed weather on Sunday, 05.12.2021
On Saturday evening the snowfall level descended down to low lying areas. On Saturday night the intensive snowfall came to an end, subsequently there were only isolated showers. During the course of the day on Sunday it turned quite sunny in the southern Upper Valais, in central Grisons and in the Upper Engadine; in the other regions of Switzerland skies remained overcast. In the furthermost southern regions it was dry and sunny during the day.
Fresh snow
Between Saturday afternoon and Sunday afternoon, the following amounts of fresh snow were registered above 2000 m:
  • western and central sectors of the northern flank of the Alps, northern and western parts of Lower Valais: 20 to 40 cm;
  • in the other regions of Switzerland, up to 20 cm over widespread areas; in the furthermost southern regions it was dry.
Thus, since Friday the following overall amounts of fresh snow have been registered above 2000 m:
  • northern flank of the Alps west of the Blüemlisalp, furthermost western part of Lower Valais: 60 to 80 cm, as much as 100 m along the French border;
  • remaining regions of the northern flank of the Alps and of northern Valais: 40 to 60 cm;
  • remaining parts of southern Valais, Grisons north of the Anterior Rhine: 20 to 40 cm; in the other regions, less.
About 40 cm of moist fresh snow was registered on the highest summits of the Jura region.
Temperature
At midday at 2000 m, between -9 °C in the northern regions and -6 °C in the southern regions.
Wind
  • During the nocturnal hours winds will be blowing at strong velocity in some places, from westerly to northwesterly directions;
  • during the daytime, winds will be blowing at light to moderate strength in the mountains.
Weather forecast through Monday, 06.12.2021
During the night, a few centimetres of snowfall is expected over widespread areas, falling down to low lying area. On Monday it will become increasingly sunny from the west, except on the northern flank of the Alps and in northern Grisons. In the southern regions it is expected to remain dry and the day will be sunny.
Fresh snow
  • On Sunday night, a few centimetres of fresh snow is anticipated over widespread areas;
  • in the southern regions and the Engadine it will remain dry.
Temperature
At midday at 2000 m, -9 °C in the northern regions and -6 °C in the southern regions.
Wind
Winds will be blowing at light to moderate strength from northerly directions, blowing from westerly directions in the Prealps.
Outlook through Wednesday, 08.12.2021
Tuesday
On Monday night, 5 to 10 cm of fresh snow falling down to low lying areas is anticipated over widespread areas. Starting at midday it will turn increasingly sunny from the west. In the southern regions it will be dry and the day will be quite sunny. The northwesterly winds will be blowing intermittently at moderate to strong velocity.
In the northern and the western regions, small snowdrift accumulations which will be prone to triggering are expected to form at high altitudes. Otherwise the avalanche danger levels will decrease on the northern flank of the Alps and in the furthermost western part of Lower Valais. In the other regions of Switzerland, avalanche danger levels are not expected to change significantly.
Wednesday
On Tuesday night precipitation will set in, and on Wednesday is expected to intensify during the course of the day. In the valleys of the north, foehn influence will still be felt in the early morning hours, elsewhere a temporarily strong-velocity southwesterly wind will be blowing.
In the western regions, avalanche danger levels are expected to increase. Also in the remaining regions of Switzerland, a slight increase in danger levels is possible.

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 bulletin is published currently. 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 bulletins 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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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.

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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.

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