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Avalanche bulletin through Wednesday, 1. February 2023

Wind slabs and weakly bonded old snow require caution

Edition: Tue 31.01., 17:00 Next update: Wed 01.02., 17:00 Validity

Avalanche bulletin through Wednesday, 1. February 2023

Wind slabs and weakly bonded old snow require caution

Edition Tue 31.01., 17:00 Next update Wed 01.02., 17:00 Validity

Avalanche bulletin through Wednesday, 1. February 2023

Wind slabs and weakly bonded old snow require caution

Edition Tue 31.01., 17:00 Next update Wed 01.02., 17:00 Validity

Avalanche bulletin through Wednesday, 1. February 2023

Wind slabs and weakly bonded old snow require caution

Edition Tue 31.01., 17:00 Next update Wed 01.02., 17:00 Validity

 
Moderate, Level 2+

Old snow, Snow drift

Avalanche prone locations
Danger level "moderate" (2+) in all aspects above 2200m. Other slopes about one danger level less.

Danger level "moderate" (2+) in all aspects above 2200m. 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 wind slabs formed in particular in gullies and bowls, and behind abrupt changes in the terrain. These are lying on the unfavourable surface of an old snowpack. Fresh and older wind slabs are to be evaluated with care and prudence.
Backcountry touring and other off-piste activities call for careful route selection.

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 a strong northwesterly wind, wind slabs formed in particular in gullies and bowls and behind abrupt changes in the terrain. They are rather small but in some cases prone to triggering. The fresh and older wind slabs are to be evaluated with care and prudence in steep terrain.
Avalanches can additionally in isolated cases be released in deeper layers also. These can in some cases reach medium size. Such avalanche prone locations are to be found in particular at transitions from a shallow to a deep snowpack.
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.

see also snowpack and weather

Moderate, Level 2=

Snow drift, Old snow

Avalanche prone locations
Danger level "moderate" (2=) in all aspects above 2200m. Other slopes about one danger level less.

Danger level "moderate" (2=) in all aspects above 2200m. Other slopes about one danger level less.

Danger description

As a consequence of a strong northwesterly wind, wind slabs formed in particular in gullies and bowls and behind abrupt changes in the terrain. They are mostly small but in some cases prone to triggering. Fresh and older wind slabs are to be evaluated with care and prudence in particular in very steep terrain.
Avalanches can additionally in isolated cases be released in deeper layers also. These can in some cases reach medium size. 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-

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

As a consequence of a sometimes strong northwesterly wind, mostly small wind slabs formed. These are to be evaluated with care and prudence in particular in very steep terrain.
Careful route selection is recommended.

see also snowpack and weather

Low, Level 1

Snow drift

As a consequence of a sometimes strong northwesterly wind, mostly shallow wind slabs formed. The 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
A little fresh snow in the central and eastern parts of the northern flank of the Alps and a strong to storm force northwesterly wind have given rise to snow drift accumulations over a wide area. The drifting snow has been deposited on the old snow surface, which is faceted in many places, or on surface hoar, and is therefore prone to triggering. In many cases the accumulations are hard and recognisable to the trained eye. Where the wind has exerted an influence adjacent to ridgelines and in pass areas, the fresh snow drift accumulations are less prone to triggering.
From southern Valais through the Gotthard region to Grisons, numerous soft faceted layers exist in the snowpack between compacted layers and crusts. These faceted layers are especially prevalent in places with shallow snow cover, where the snowpack can be penetrated down to the ground by skis. On the northern flank of the Alps the base of the snowpack is well bonded in many instances, but multiple faceted layers exist nearer the surface. The bonding of the snowpack is most favourable in the extreme west of Lower Valais and in northern Lower Valais.
Observed weather review Tuesday, 31.01.2023
On Monday night a little snow fell in the northeast. The north and east were sunny for a time once the residual cloud dispersed, before becoming increasingly cloudy again in the afternoon. The south was mostly sunny.
Fresh snow
In the period from Monday evening until Tuesday morning, approximately 5 to 10 cm of snow fell, locally as much as 15 cm, in the central and eastern parts of the northern flank of the Alps and in northern Grisons and northern Lower Engadine.
Temperature
At midday at 2000 m: about -4 °C in the north and +1 °C in the south
Wind
During the night
  • Moderate, sometimes strong, from westerly directions
  • At elevated altitudes and in the south, strong to storm force from northerly directions
During the day
  • Light to moderate from westerly directions
  • At elevated altitudes, moderate, on the main Alpine ridge and in the east, sometimes strong, from the northwest
Weather forecast through Wednesday, 01.02.2023
On Wednesday the weather will be changeable. In the northeast a few centimetres of snow will fall above 600 m during the night and in the daytime. As the day progresses, cloud will build up from the north; sunny weather will persist longer in the inneralpine regions and the south.
Fresh snow
-
Temperature
At midday at 2000 m: about -7 °C in the north and -2 °C in the south
Wind
  • Moderate to strong from westerly directions
  • At elevated altitudes and in the south, strong from the northwest
Outlook through Friday, 03.02.2023
Thursday
On Wednesday night, snowfall will arrive from the northwest. During the day, snow will fall over a wide area and in some cases persistently. The snowfall level will be approximately 700 m. By the evening, 20 to 30 cm of snow will fall in the central and eastern parts of the northern flank of the Alps and in northern Grisons. Elsewhere 5 to 15 cm of snow will fall over a wide area, but it will remain dry in the far south. A strong, sometimes storm force northwesterly wind will persist.
As a consequence of fresh snow, wind and the unfavourable old snow surfaces, the avalanche danger will increase significantly in the north as the day progresses. In the south it will not change significantly.
Friday
It will be very cloudy and, in the period to Friday morning, snow will continue to fall over a wide area in the north. The snowfall level will rise from 700 m towards 1000 m. As the day progresses, the snowfall will ease from the west. By the evening a further 10 to 20 cm of snow will fall in the central and eastern parts of the northern flank of the Alps and in northern Grisons. The wind will ease a little, but at elevated altitudes and in the south will remain strong from the northwest.
As a consequence of fresh snow and wind, the avalanche danger will continue to increase in central and eastern parts of the northern flank of the Alps and in parts of Grisons. In the other regions it will not change significantly.
 

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
A little fresh snow in the central and eastern parts of the northern flank of the Alps and a strong to storm force northwesterly wind have given rise to snow drift accumulations over a wide area. The drifting snow has been deposited on the old snow surface, which is faceted in many places, or on surface hoar, and is therefore prone to triggering. In many cases the accumulations are hard and recognisable to the trained eye. Where the wind has exerted an influence adjacent to ridgelines and in pass areas, the fresh snow drift accumulations are less prone to triggering.
From southern Valais through the Gotthard region to Grisons, numerous soft faceted layers exist in the snowpack between compacted layers and crusts. These faceted layers are especially prevalent in places with shallow snow cover, where the snowpack can be penetrated down to the ground by skis. On the northern flank of the Alps the base of the snowpack is well bonded in many instances, but multiple faceted layers exist nearer the surface. The bonding of the snowpack is most favourable in the extreme west of Lower Valais and in northern Lower Valais.
Observed weather review Tuesday, 31.01.2023
On Monday night a little snow fell in the northeast. The north and east were sunny for a time once the residual cloud dispersed, before becoming increasingly cloudy again in the afternoon. The south was mostly sunny.
Fresh snow
In the period from Monday evening until Tuesday morning, approximately 5 to 10 cm of snow fell, locally as much as 15 cm, in the central and eastern parts of the northern flank of the Alps and in northern Grisons and northern Lower Engadine.
Temperature
At midday at 2000 m: about -4 °C in the north and +1 °C in the south
Wind
During the night
  • Moderate, sometimes strong, from westerly directions
  • At elevated altitudes and in the south, strong to storm force from northerly directions
During the day
  • Light to moderate from westerly directions
  • At elevated altitudes, moderate, on the main Alpine ridge and in the east, sometimes strong, from the northwest
Weather forecast through Wednesday, 01.02.2023
On Wednesday the weather will be changeable. In the northeast a few centimetres of snow will fall above 600 m during the night and in the daytime. As the day progresses, cloud will build up from the north; sunny weather will persist longer in the inneralpine regions and the south.
Fresh snow
-
Temperature
At midday at 2000 m: about -7 °C in the north and -2 °C in the south
Wind
  • Moderate to strong from westerly directions
  • At elevated altitudes and in the south, strong from the northwest
Outlook through Friday, 03.02.2023
Thursday
On Wednesday night, snowfall will arrive from the northwest. During the day, snow will fall over a wide area and in some cases persistently. The snowfall level will be approximately 700 m. By the evening, 20 to 30 cm of snow will fall in the central and eastern parts of the northern flank of the Alps and in northern Grisons. Elsewhere 5 to 15 cm of snow will fall over a wide area, but it will remain dry in the far south. A strong, sometimes storm force northwesterly wind will persist.
As a consequence of fresh snow, wind and the unfavourable old snow surfaces, the avalanche danger will increase significantly in the north as the day progresses. In the south it will not change significantly.
Friday
It will be very cloudy and, in the period to Friday morning, snow will continue to fall over a wide area in the north. The snowfall level will rise from 700 m towards 1000 m. As the day progresses, the snowfall will ease from the west. By the evening a further 10 to 20 cm of snow will fall in the central and eastern parts of the northern flank of the Alps and in northern Grisons. The wind will ease a little, but at elevated altitudes and in the south will remain strong from the northwest.
As a consequence of fresh snow and wind, the avalanche danger will continue to increase in central and eastern parts of the northern flank of the Alps and in parts of Grisons. In the other regions it will not change significantly.

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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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