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Avalanche bulletin for Monday, 6. February 2023

In the east a considerable avalanche danger will be encountered over a wide area

Edition: Mon 06.02., 08:00 Next update: Mon 06.02., 17:00 Validity

Avalanche bulletin for Monday, 6. February 2023

In the east a considerable avalanche danger will be encountered over a wide area

Edition Mon 06.02., 08:00 Next update Mon 06.02., 17:00 Validity

Avalanche bulletin for Monday, 6. February 2023

In the east a considerable avalanche danger will be encountered over a wide area

Edition Mon 06.02., 08:00 Next update Mon 06.02., 17:00 Validity

Avalanche bulletin for Monday, 6. February 2023

In the east a considerable avalanche danger will be encountered over a wide area

Edition Mon 06.02., 08:00 Next update Mon 06.02., 17:00 Validity

 
Considerable, Level 3=

Old snow, New snow

Avalanche prone locations
Danger level "considerable" (3=) in all aspects above 1800m. Other slopes about one danger level less.

Danger level "considerable" (3=) in all aspects above 1800m. Other slopes about one danger level less.

Danger description

The new snow and wind slabs are lying on top of a weakly bonded old snowpack in all aspects. Even single winter sport participants can release avalanches easily, including large ones. Remotely triggered avalanches are probable. Whumpfing sounds and the formation of shooting cracks when stepping on the snowpack indicate the danger.
Backcountry touring and other off-piste activities call for caution and restraint.

see also snowpack and weather

Considerable, Level 3=

Old snow, New snow

Avalanche prone locations
Danger level "considerable" (3=) in all aspects above 1800m. Other slopes about one danger level less.

Danger level "considerable" (3=) in all aspects above 1800m. Other slopes about one danger level less.

Danger description

The new snow and wind slabs are lying on the unfavourable surface of an old snowpack. Additionally in some places avalanches can also penetrate deep layers and reach dangerously large size. Single winter sport participants can release avalanches easily. Remotely triggered avalanches are possible in isolated cases. Whumpfing sounds can indicate the danger.
Backcountry touring and other off-piste activities call for experience in the assessment of avalanche danger.

see also snowpack and weather

Considerable, Level 3-

Old snow, Snow drift

Avalanche prone locations
Danger level "considerable" (3-) in all aspects above 2000m. Other slopes about one danger level less.

Danger level "considerable" (3-) in all aspects above 2000m. Other slopes about one danger level less.

Danger description

The wind slabs of the last few days are lying on top of a weakly bonded old snowpack. Even single winter sport participants can release avalanches easily. Remotely triggered avalanches are possible. Whumpfing sounds and the formation of shooting cracks when stepping on the snowpack indicate the danger.
Backcountry touring and other off-piste activities call for experience in the assessment of avalanche danger.

see also snowpack and weather

Moderate, Level 2+

Old snow, Snow drift

Avalanche prone locations
Danger level "moderate" (2+) in all aspects above 2000m. Other slopes about one danger level less.

Danger level "moderate" (2+) in all aspects above 2000m. Other slopes about one danger level less.

Danger description

The wind slabs of the last few days are lying on top of a weakly bonded old snowpack. Avalanches can be released easily, but they will be small in most cases. Backcountry touring and other off-piste activities call for careful route selection. Wind slabs in steep terrain are to be bypassed as far as possible.

see also snowpack and weather

Moderate, Level 2+

Snow drift, Old snow

Avalanche prone locations
Danger level "moderate" (2+) in all aspects above 2000m. Other slopes about one danger level less.

Danger level "moderate" (2+) in all aspects above 2000m. Other slopes about one danger level less.

Danger description

As a consequence of new snow and a moderate to strong northeasterly wind, avalanche prone wind slabs formed in particular in gullies and bowls and behind abrupt changes in the terrain. They are to be evaluated with care and prudence in steep terrain. The number and size of avalanche prone locations will increase with altitude.
Avalanches can additionally in isolated cases be released in deeper layers also. Such avalanche prone locations are to be found in particular at transitions from a shallow to a deep snowpack.
Backcountry touring and other off-piste activities call for careful route selection.

see also snowpack and weather

Moderate, Level 2=

Old snow, Snow drift

Avalanche prone locations
Danger level "moderate" (2=) in all aspects above 2400m. Other slopes about one danger level less.

Danger level "moderate" (2=) in all aspects above 2400m. Other slopes about one danger level less.

Danger description

To some extent avalanches can be released in the old snowpack and reach medium size. These avalanche prone locations are to be found in particular at transitions from a shallow to a deep snowpack.
In addition the more recent wind slabs are prone to triggering in some cases. They are to be found in particular in gullies and bowls, and behind abrupt changes in the terrain. The wind slabs are to be evaluated with care and prudence in very steep terrain.
Careful route selection is recommended.

see also snowpack and weather

Moderate, Level 2-

Snow drift

Avalanche prone locations
Danger level "moderate" (2-) in west to north to southeast facing aspects above 2400m. Other slopes about one danger level less.

Danger level "moderate" (2-) in west to north to southeast facing aspects above 2400m. Other slopes about one danger level less.

Danger description

The fresh and somewhat older wind slabs are in some cases prone to triggering. They are to be evaluated with care and prudence in particular in very steep terrain. 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.

see also snowpack and weather

Low, Level 1

No distinct avalanche problem

Individual avalanche prone locations are to be found in particular in extremely steep terrain. Even a small avalanche can sweep people along and give rise to falls.

see also snowpack and weather

Snowpack
Fresh fallen snow and snowdrifts from the last few days, as well as the snowdrifts which were generated from the fresh snow, frequently lie deposited on top of a weakened old snowpack surface. Prior to the snowfall, the old snowpack surface was expansively metamorphosed (faceted) and loosely-packed in wind-protected, distant-from-ridgeline terrain more than anywhere else. Avalanches generally fracture in transition zones between the fresh snow and snowdrifts and the old snowpack. Particularly from southern Valais over the Gotthard region as far as the Grisons, the entire old snowpack was frequently expansively metamorphosed (faceted). In these regions, avalanches can sweep away the entire snowpack as a whole.
In the northern and furthermost western parts of the Lower Valais, the snow cover layering is most favourable and there are hardly any pronounced weak layers evident.
Observed weather review Sunday, 05.02.2023
Following a night of predominantly clear skies it was still quite sunny in the western and the southern regions during the morning hours. In the remaining regions of Switzerland, skies became increasingly overcast. Subsequently in the northern regions, light snowfall set in during the afternoon, extending down to low lying areas.
Fresh snow
On the northern flank of the Alps, only a few centimetres from place to place.
Temperature
At midday, approximately -3 °C in the western regions, 0 °C in the southern regions, and -6 °C in the eastern regions.
Wind
Winds were northerly,
  • blowing at moderate to strong velocity on the Main Alpine Ridge;
  • blowing at light to moderate strength in the other regions of Switzerland.
Weather forecast through Monday, 06.02.2023
In the early part of the night in the northern regions in particular, snowfall is anticipated, extending down to low lying areas. During the daytime hours it is expected to be quite sunny in the mountains.
Fresh snow
Between Sunday afternoon and Monday morning, the following amounts of fresh snow are expected above 1200 m:
  • northern flank of the Alps: 5 to 15 cm;
  • in the remaining regions of Switzerland only a few centimetres; in the Ticino and the Engadine it is expected to remain dry.
Temperature
At midday at 2000 m, between -4 °C in the western and the southern regions and -8 °C in the eastern regions.
Wind
  • Winds will be northeasterly, blowing at moderate strength;
  • in the Jura region and in the western Prealps, a moderate-to-strong velocity bise wind will be blowing.
Outlook through Wednesday, 08.02.2023
On Tuesday and on Wednesday, it will be predominantly sunny. On Tuesday a temporarily strong-velocity southerly wind will be blowing. On Wednesday winds will be predominantly light. Temperatures are expected to remain relatively low. Avalanche danger levels will incrementally decrease, but in the eastern regions, backcountry terrain will remain treacherous for winter sports enthusiasts away from the secured ski pistes.
 

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:

Snowpack
Fresh fallen snow and snowdrifts from the last few days, as well as the snowdrifts which were generated from the fresh snow, frequently lie deposited on top of a weakened old snowpack surface. Prior to the snowfall, the old snowpack surface was expansively metamorphosed (faceted) and loosely-packed in wind-protected, distant-from-ridgeline terrain more than anywhere else. Avalanches generally fracture in transition zones between the fresh snow and snowdrifts and the old snowpack. Particularly from southern Valais over the Gotthard region as far as the Grisons, the entire old snowpack was frequently expansively metamorphosed (faceted). In these regions, avalanches can sweep away the entire snowpack as a whole.
In the northern and furthermost western parts of the Lower Valais, the snow cover layering is most favourable and there are hardly any pronounced weak layers evident.
Observed weather review Sunday, 05.02.2023
Following a night of predominantly clear skies it was still quite sunny in the western and the southern regions during the morning hours. In the remaining regions of Switzerland, skies became increasingly overcast. Subsequently in the northern regions, light snowfall set in during the afternoon, extending down to low lying areas.
Fresh snow
On the northern flank of the Alps, only a few centimetres from place to place.
Temperature
At midday, approximately -3 °C in the western regions, 0 °C in the southern regions, and -6 °C in the eastern regions.
Wind
Winds were northerly,
  • blowing at moderate to strong velocity on the Main Alpine Ridge;
  • blowing at light to moderate strength in the other regions of Switzerland.
Weather forecast through Monday, 06.02.2023
In the early part of the night in the northern regions in particular, snowfall is anticipated, extending down to low lying areas. During the daytime hours it is expected to be quite sunny in the mountains.
Fresh snow
Between Sunday afternoon and Monday morning, the following amounts of fresh snow are expected above 1200 m:
  • northern flank of the Alps: 5 to 15 cm;
  • in the remaining regions of Switzerland only a few centimetres; in the Ticino and the Engadine it is expected to remain dry.
Temperature
At midday at 2000 m, between -4 °C in the western and the southern regions and -8 °C in the eastern regions.
Wind
  • Winds will be northeasterly, blowing at moderate strength;
  • in the Jura region and in the western Prealps, a moderate-to-strong velocity bise wind will be blowing.
Outlook through Wednesday, 08.02.2023
On Tuesday and on Wednesday, it will be predominantly sunny. On Tuesday a temporarily strong-velocity southerly wind will be blowing. On Wednesday winds will be predominantly light. Temperatures are expected to remain relatively low. Avalanche danger levels will incrementally decrease, but in the eastern regions, backcountry terrain will remain treacherous for winter sports enthusiasts away from the secured ski pistes.

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.

 

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.

 

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

 

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An expert analysis of previous week’s avalanche situation.

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Destructive avalanches and avalanche accidents

Recent and older avalanche accidents incl. statistical analysis.

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