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Avalanche bulletin through Thursday, 13 December 2018

Decrease in avalanche danger

Edition: We. 12.12., 17:00 Next update: Th. 13.12., 17:00 Validity

Avalanche bulletin through Thursday, 13 December 2018

Decrease in avalanche danger

Edition We. 12.12., 17:00 Next update Th. 13.12., 18:00 Validity

Avalanche bulletin through Thursday, 13 December 2018

Decrease in avalanche danger

Edition We. 12.12., 17:00 Next update Th. 13.12., 17:00 Validity

Avalanche bulletin through Thursday, 13 December 2018

Decrease in avalanche danger

Edition We. 12.12., 17:00 Next update Th. 13.12., 17:00 Validity

 
Level 2, moderate

Fresh snow, old snow

Avalanche prone locations
In all aspects above approximately 2000m.

In all aspects above approximately 2000m.

Danger description

The fresh snow and wind slabs of the last few days can be released in isolated cases, but mostly only by large additional loads,. In isolated cases avalanches can also be triggered in the old snowpack and reach large size. Caution is to be exercised in particular on steep shady slopes above approximately 2200 m and in areas where the snow cover is rather shallow. Careful route selection and spacing between individuals are recommended.
Grisons: As a consequence of a strengthening southwesterly wind, mostly small wind slabs will form as the day progresses at elevated altitudes.

Gliding avalanches

Mostly small gliding avalanches are to be expected below approximately 2000 m. They can be released at any time of day or night. Caution is to be exercised in areas with glide cracks.

see also snowpack and weather

Level 2, moderate

Wind slabs

Avalanche prone locations
In all aspects above approximately 2000m.

In all aspects above approximately 2000m.

Danger description

As a consequence of fresh snow and northerly wind, sometimes avalanche prone wind slabs formed. These are to be found in gullies and bowls, and behind abrupt changes in the terrain. They are to be evaluated with care and prudence.

see also snowpack and weather

Level 1, low

The wind slabs of the weekend are to be evaluated with care and prudence especially in extremely steep terrain. Restraint should be exercised because avalanches can sweep people along and give rise to falls.

see also snowpack and weather

Level 3, considerable

Wind slabs

Avalanche prone locations
In particular in east to south to west facing aspects above approximately 2000m.

In particular in east to south to west facing aspects above approximately 2000m.

Danger description

As a consequence of a strong northerly wind, avalanche prone wind slabs formed in the last few days. They are covered with fresh snow in some cases and therefore difficult to recognise.
Even single winter sport participants can release avalanches, including large ones. Snow sport activities outside marked and open pistes call for experience in the assessment of avalanche danger and careful route selection.

Gliding avalanches

Mostly small gliding avalanches are to be expected below approximately 2000 m. They can be released at any time of day or night. Caution is to be exercised in areas with glide cracks.

see also snowpack and weather

Level 2, moderate

Dry avalanches

Avalanche prone locations
In all aspects above approximately 2000m.

In all aspects above approximately 2000m.

Danger description

The fresh snow and wind slabs of the last few days can be released in isolated cases, but mostly only by large additional loads,. In particular transitions from a shallow to a deep snowpack are precarious. Medium-sized and, in isolated cases, large avalanches are possible. Careful route selection and spacing between individuals are recommended.
Central and eastern parts of the northern flank of the Alps and northern Grisons: As a consequence of a strengthening southwesterly wind, mostly small wind slabs will form as the day progresses at elevated altitudes.

Gliding avalanches

Mostly small gliding avalanches are to be expected below approximately 2000 m. They can be released at any time of day or night. Caution is to be exercised in areas with glide cracks.

see also snowpack and weather

Level 1, low

Individual avalanche prone locations are to be found in extremely steep terrain. Even a small snow slide can sweep snow sport participants along and give rise to falls.

see also snowpack and weather

Decrease in avalanche danger
Edition: 12.12.2018, 17:00 / Next update: 13.12.2018, 18:00
Snowpack
The deep layers of fresh snow and freshly generated snowdrifts which formed between Friday and Tuesday are continuing the process of settling and consolidating. The bonding to the old snowpack is most likely to be unfavourable on north-facing slopes above 2200 m. In these regions there are weakened layers of faceted (expansively metamorphosed) snow crystals embedded inside the snow cover. On south-facing slopes and in general below 2200 m, the snowpack layering is predominantly favourable.
Observed weather on Wednesday, 12.12.2018
Following a night of cold, clear skies, it was sunny.
Fresh snow
-
Temperature
At midday at 2000 m, between -4 °C in western regions and -8 °C in eastern and southern regions.
Wind
Winds were blowing at light to moderate strength from northerly directions, then shifting to westerly.
Weather forecast through Thursday, 13.12.2018
In the northern regions it is expected to be sunny for the most part. During the afternoon, cloud cover will move in from the west. In the southern regions, clouds will move in during the night and subsequently, light snowfall is anticipated down to low lying areas during the daytime.
Fresh snow
Only a few centimetres on the southern flank of the Alps is possible.
Temperature
At midday at 2000 m, between -8 °C in northern regions and -10 °C in southern regions.
Wind
  • Winds will be blowing at predominantly light to moderate strength from southwesterly directions;
  • during the daytime in southern regions and particularly at high altitude in the eastern regions of Switzerland, winds will also be blowing at strong velocity from south to southwest.
Outlook through Saturday, 15.12.2018
On Thursday night in the western and central sectors of the northern flank of the Alps, skies will be overcast and a small amount of snowfall is possible. In the southern regions, skies will also be overcast during the night, but it will remain dry. During the daytime it will be sunny in all regions of Switzerland. On Saturday, mostly sunny weather is anticipated. During the course of the day, dense cloudbanks will move in from the west.
Avalanche danger is expected to decrease incrementally.
 

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:

Decrease in avalanche danger
Edition: 12.12.2018, 17:00 / Next update: 13.12.2018, 18:00
Snowpack
The deep layers of fresh snow and freshly generated snowdrifts which formed between Friday and Tuesday are continuing the process of settling and consolidating. The bonding to the old snowpack is most likely to be unfavourable on north-facing slopes above 2200 m. In these regions there are weakened layers of faceted (expansively metamorphosed) snow crystals embedded inside the snow cover. On south-facing slopes and in general below 2200 m, the snowpack layering is predominantly favourable.
Observed weather on Wednesday, 12.12.2018
Following a night of cold, clear skies, it was sunny.
Fresh snow
-
Temperature
At midday at 2000 m, between -4 °C in western regions and -8 °C in eastern and southern regions.
Wind
Winds were blowing at light to moderate strength from northerly directions, then shifting to westerly.
Weather forecast through Thursday, 13.12.2018
In the northern regions it is expected to be sunny for the most part. During the afternoon, cloud cover will move in from the west. In the southern regions, clouds will move in during the night and subsequently, light snowfall is anticipated down to low lying areas during the daytime.
Fresh snow
Only a few centimetres on the southern flank of the Alps is possible.
Temperature
At midday at 2000 m, between -8 °C in northern regions and -10 °C in southern regions.
Wind
  • Winds will be blowing at predominantly light to moderate strength from southwesterly directions;
  • during the daytime in southern regions and particularly at high altitude in the eastern regions of Switzerland, winds will also be blowing at strong velocity from south to southwest.
Outlook through Saturday, 15.12.2018
On Thursday night in the western and central sectors of the northern flank of the Alps, skies will be overcast and a small amount of snowfall is possible. In the southern regions, skies will also be overcast during the night, but it will remain dry. During the daytime it will be sunny in all regions of Switzerland. On Saturday, mostly sunny weather is anticipated. During the course of the day, dense cloudbanks will move in from the west.
Avalanche danger is expected to decrease incrementally.

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 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;
  • 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.

 

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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