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Avalanche bulletin through Thursday, 29 October 2020

Wintery conditions in the mountains, considerable avalanche danger in some regions

Edition: Tu. 27.10., 17:00 Next update: Th. 29.10., 18:00 Validity

Avalanche bulletin through Thursday, 29 October 2020

Wintery conditions in the mountains, considerable avalanche danger in some regions

Edition Tu. 27.10., 17:00 Next update Th. 29.10., 18:00 Validity

Avalanche bulletin through Thursday, 29 October 2020

Wintery conditions in the mountains, considerable avalanche danger in some regions

Edition Tu. 27.10., 17:00 Next update Th. 29.10., 18:00 Validity

Avalanche bulletin through Thursday, 29 October 2020

Wintery conditions in the mountains, considerable avalanche danger in some regions

Edition Tu. 27.10., 17:00 Next update Th. 29.10., 18:00 Validity

 
Wintery conditions in the mountains, considerable avalanche danger in some regions
Edition: 27.10.2020, 17:00 / Next update: 29.10.2020, 18:00
Avalanche danger
Dry-snow avalanches
Main Alpine Ridge from Goms into Bernina region, northern Ticino, Glarus Alps, Sargans region, Grisons:
Considerable avalanche danger (Level 3) on steep slopes in west-facing to north-facing to south-facing aspects above approximately 2400 m. The fresh fallen snow and freshly generated snowdrift accumulations are easily triggered in some places. Avalanches can grow to medium size. More than anywhere else on the Main Alpine Ridge from Lukmanier Pass into the Bernina, as well as in the regions bordering to the north, large-sized avalanches are possible in the high alpine regions. Backcountry skiing tours and high-altitude mountaineering ventures require experience in the assessment of avalanche dangers on-site.

Remaining regions of the Swiss Alps:
Moderate avalanche danger (Level 2) on steep slopes in west-facing to north-facing to southeast-facing aspects above approximately 2400 m. The major peril stems from freshly generated snowdrift accumulations more than anything else. Winter sports enthusiasts can trigger small to medium-sized avalanches. Particularly on shady slopes, avalanches can be triggered easily in some places. A prudent route selection is important.
Gliding-snow and wet-snow avalanches
In all regions of Switzerland, gliding-snow avalanches can be expected below approximately 2400 m. These avalanches can grow to medium size in the areas of maximal precipitation in the south and in the east. Zones where there are gliding cracks visible on the snowpack surface should be circumvented whenever possible. In addition, moist-snow slides and moist-snow avalanches can be expected to trigger from the fresh snow on very steep, sunny slopes during the course of the day on Wednesday.
Snow and weather
Snowpack
Snow depths at 2500 m altitude in the western regions are 20 to 50 cm, in the eastern and southern regions at 50 to 80 cm. In the high alpine regions there is already significantly more snow. Particularly on shady, wind-protected slopes above approximately 2600 m, the fresh fallen snow of the last few days has been deposited on top of an area-wide, continuous old snowpack. On north-facing slopes below approximately 2200 m and on south-facing slopes below approximately 2600 m, the fresh snow was deposited on bare ground over widespread areas.
As a result of strong-velocity westerly winds, fresh snowdrift accumulations are expected to be generated on the northern flank of the Alps and at high altitudes in general.
Weather review to Monday, 26 October
On Monday there was precipitation registered over widespread areas, in the southern and eastern regions intermittently intensive. On Tuesday in the western and southern regions it became increasingly sunny, in the eastern regions skies were heavily overcast for the most part, accompanied by last snowflakes. Winds were blowing at light to moderate strength from westerly to northwesterly directions, intermittently blowing at moderate-to-strong velocity on the Main Alpine Ridge and southwards therefrom.

Between Monday morning and Tuesday midday in the northern regions above approximately 2000 m, in the southern regions above approximately 2500 m, the following amounts of fresh snow were registered:
  • Main Alpine Ridge from Lukmanier Pass into the Upper Engadine including the regions of central Grisons bordering immediately to the north, Ticino, Moesano, Val Bregaglia and Val Poschiavo: 50 to 80 cm, in the high alpine regions as much as 100 cm;
  • northern Alpine Ridge from the Aletsch region into the Glarus Alps, remaining parts of the Gotthard region, remaining parts of Grisons and Ticino: 30 to 50 cm;
  • in the other regions of Switzerland: 15 to 30 cm over widespread areas.
These registered amounts of fresh snow are in some places extremely high for this juncture of the season, although not record-breaking amounts. Particularly in the eastern Alps, such amounts of snowfall at intermediate and high altitudes occur only once every 10 to 40 years.
Weather outlook through Thursday, 29.10
On Wednesday in the northern regions, skies will be overcast by and large, accompanied by light precipitation and isolated bright intervals during the afternoon. The snowfall level will ascend to approximately 2100 m. In the inneralpine and the southern regions it is expected to become increasingly sunny. On Thursday in the northern regions, skies will be heavily overcast accompanied by precipitation. The snowfall level will descend down to 1600-1900 m. South of the Main Alpine Ridge it will be generally sunny. Winds will be blowing from westerly directions, at strong velocity on the northern flank of the Alps and at high altitudes in general, at light-to-moderate strength in the other regions of Switzerland.

Between Tuesday afternoon and Thursday afternoon, the following amounts of fresh snow are anticipated above approximately 2200 m:
  • central and eastern sectors of the northern flank of the Alps: 15 to 25 cm;
  • remaining regions of the northern flank of the Alps, furthermost western part of Lower Valais, Prättigau, northern Lower Engadine: 5 to 15 cm;
  • in the other regions of Switzerland, only a few centimetres, or else it will remain dry.
Outlook
On Friday it will be sunny for the most part. Temperatures will be significantly milder, the zero-degree level will ascend to over 3000 m, starting in the west. The danger of dry-snow avalanches will decrease. The danger of wet-snow avalanches is expected to increase during the course of the day, including at high altitudes. Zones where glide cracks are visible on the snowpack surface should continue to be circumvented.

Keep informed about the publication of unannounced Avalanche Bulletins. Activate in the App WhiteRisk the "Push Summer Bulletin". The SMS service "SLF Sommer" will be discontinued on 31.12.20.
Wintery conditions in the mountains, considerable avalanche danger in some regions
Edition: 27.10.2020, 17:00 / Next update: 29.10.2020, 18:00
Avalanche danger
Dry-snow avalanches
Main Alpine Ridge from Goms into Bernina region, northern Ticino, Glarus Alps, Sargans region, Grisons:
Considerable avalanche danger (Level 3) on steep slopes in west-facing to north-facing to south-facing aspects above approximately 2400 m. The fresh fallen snow and freshly generated snowdrift accumulations are easily triggered in some places. Avalanches can grow to medium size. More than anywhere else on the Main Alpine Ridge from Lukmanier Pass into the Bernina, as well as in the regions bordering to the north, large-sized avalanches are possible in the high alpine regions. Backcountry skiing tours and high-altitude mountaineering ventures require experience in the assessment of avalanche dangers on-site.

Remaining regions of the Swiss Alps:
Moderate avalanche danger (Level 2) on steep slopes in west-facing to north-facing to southeast-facing aspects above approximately 2400 m. The major peril stems from freshly generated snowdrift accumulations more than anything else. Winter sports enthusiasts can trigger small to medium-sized avalanches. Particularly on shady slopes, avalanches can be triggered easily in some places. A prudent route selection is important.
Gliding-snow and wet-snow avalanches
In all regions of Switzerland, gliding-snow avalanches can be expected below approximately 2400 m. These avalanches can grow to medium size in the areas of maximal precipitation in the south and in the east. Zones where there are gliding cracks visible on the snowpack surface should be circumvented whenever possible. In addition, moist-snow slides and moist-snow avalanches can be expected to trigger from the fresh snow on very steep, sunny slopes during the course of the day on Wednesday.
Snow and weather
Snowpack
Snow depths at 2500 m altitude in the western regions are 20 to 50 cm, in the eastern and southern regions at 50 to 80 cm. In the high alpine regions there is already significantly more snow. Particularly on shady, wind-protected slopes above approximately 2600 m, the fresh fallen snow of the last few days has been deposited on top of an area-wide, continuous old snowpack. On north-facing slopes below approximately 2200 m and on south-facing slopes below approximately 2600 m, the fresh snow was deposited on bare ground over widespread areas.
As a result of strong-velocity westerly winds, fresh snowdrift accumulations are expected to be generated on the northern flank of the Alps and at high altitudes in general.
Weather review to Monday, 26 October
On Monday there was precipitation registered over widespread areas, in the southern and eastern regions intermittently intensive. On Tuesday in the western and southern regions it became increasingly sunny, in the eastern regions skies were heavily overcast for the most part, accompanied by last snowflakes. Winds were blowing at light to moderate strength from westerly to northwesterly directions, intermittently blowing at moderate-to-strong velocity on the Main Alpine Ridge and southwards therefrom.

Between Monday morning and Tuesday midday in the northern regions above approximately 2000 m, in the southern regions above approximately 2500 m, the following amounts of fresh snow were registered:
  • Main Alpine Ridge from Lukmanier Pass into the Upper Engadine including the regions of central Grisons bordering immediately to the north, Ticino, Moesano, Val Bregaglia and Val Poschiavo: 50 to 80 cm, in the high alpine regions as much as 100 cm;
  • northern Alpine Ridge from the Aletsch region into the Glarus Alps, remaining parts of the Gotthard region, remaining parts of Grisons and Ticino: 30 to 50 cm;
  • in the other regions of Switzerland: 15 to 30 cm over widespread areas.
These registered amounts of fresh snow are in some places extremely high for this juncture of the season, although not record-breaking amounts. Particularly in the eastern Alps, such amounts of snowfall at intermediate and high altitudes occur only once every 10 to 40 years.
Weather outlook through Thursday, 29.10
On Wednesday in the northern regions, skies will be overcast by and large, accompanied by light precipitation and isolated bright intervals during the afternoon. The snowfall level will ascend to approximately 2100 m. In the inneralpine and the southern regions it is expected to become increasingly sunny. On Thursday in the northern regions, skies will be heavily overcast accompanied by precipitation. The snowfall level will descend down to 1600-1900 m. South of the Main Alpine Ridge it will be generally sunny. Winds will be blowing from westerly directions, at strong velocity on the northern flank of the Alps and at high altitudes in general, at light-to-moderate strength in the other regions of Switzerland.

Between Tuesday afternoon and Thursday afternoon, the following amounts of fresh snow are anticipated above approximately 2200 m:
  • central and eastern sectors of the northern flank of the Alps: 15 to 25 cm;
  • remaining regions of the northern flank of the Alps, furthermost western part of Lower Valais, Prättigau, northern Lower Engadine: 5 to 15 cm;
  • in the other regions of Switzerland, only a few centimetres, or else it will remain dry.
Outlook
On Friday it will be sunny for the most part. Temperatures will be significantly milder, the zero-degree level will ascend to over 3000 m, starting in the west. The danger of dry-snow avalanches will decrease. The danger of wet-snow avalanches is expected to increase during the course of the day, including at high altitudes. Zones where glide cracks are visible on the snowpack surface should continue to be circumvented.

Keep informed about the publication of unannounced Avalanche Bulletins. Activate in the App WhiteRisk the "Push Summer Bulletin". The SMS service "SLF Sommer" will be discontinued on 31.12.20.
 

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:

Wintery conditions in the mountains, considerable avalanche danger in some regions
Edition: 27.10.2020, 17:00 / Next update: 29.10.2020, 18:00
Avalanche danger
Dry-snow avalanches
Main Alpine Ridge from Goms into Bernina region, northern Ticino, Glarus Alps, Sargans region, Grisons:
Considerable avalanche danger (Level 3) on steep slopes in west-facing to north-facing to south-facing aspects above approximately 2400 m. The fresh fallen snow and freshly generated snowdrift accumulations are easily triggered in some places. Avalanches can grow to medium size. More than anywhere else on the Main Alpine Ridge from Lukmanier Pass into the Bernina, as well as in the regions bordering to the north, large-sized avalanches are possible in the high alpine regions. Backcountry skiing tours and high-altitude mountaineering ventures require experience in the assessment of avalanche dangers on-site.

Remaining regions of the Swiss Alps:
Moderate avalanche danger (Level 2) on steep slopes in west-facing to north-facing to southeast-facing aspects above approximately 2400 m. The major peril stems from freshly generated snowdrift accumulations more than anything else. Winter sports enthusiasts can trigger small to medium-sized avalanches. Particularly on shady slopes, avalanches can be triggered easily in some places. A prudent route selection is important.
Gliding-snow and wet-snow avalanches
In all regions of Switzerland, gliding-snow avalanches can be expected below approximately 2400 m. These avalanches can grow to medium size in the areas of maximal precipitation in the south and in the east. Zones where there are gliding cracks visible on the snowpack surface should be circumvented whenever possible. In addition, moist-snow slides and moist-snow avalanches can be expected to trigger from the fresh snow on very steep, sunny slopes during the course of the day on Wednesday.
Snow and weather
Snowpack
Snow depths at 2500 m altitude in the western regions are 20 to 50 cm, in the eastern and southern regions at 50 to 80 cm. In the high alpine regions there is already significantly more snow. Particularly on shady, wind-protected slopes above approximately 2600 m, the fresh fallen snow of the last few days has been deposited on top of an area-wide, continuous old snowpack. On north-facing slopes below approximately 2200 m and on south-facing slopes below approximately 2600 m, the fresh snow was deposited on bare ground over widespread areas.
As a result of strong-velocity westerly winds, fresh snowdrift accumulations are expected to be generated on the northern flank of the Alps and at high altitudes in general.
Weather review to Monday, 26 October
On Monday there was precipitation registered over widespread areas, in the southern and eastern regions intermittently intensive. On Tuesday in the western and southern regions it became increasingly sunny, in the eastern regions skies were heavily overcast for the most part, accompanied by last snowflakes. Winds were blowing at light to moderate strength from westerly to northwesterly directions, intermittently blowing at moderate-to-strong velocity on the Main Alpine Ridge and southwards therefrom.

Between Monday morning and Tuesday midday in the northern regions above approximately 2000 m, in the southern regions above approximately 2500 m, the following amounts of fresh snow were registered:
  • Main Alpine Ridge from Lukmanier Pass into the Upper Engadine including the regions of central Grisons bordering immediately to the north, Ticino, Moesano, Val Bregaglia and Val Poschiavo: 50 to 80 cm, in the high alpine regions as much as 100 cm;
  • northern Alpine Ridge from the Aletsch region into the Glarus Alps, remaining parts of the Gotthard region, remaining parts of Grisons and Ticino: 30 to 50 cm;
  • in the other regions of Switzerland: 15 to 30 cm over widespread areas.
These registered amounts of fresh snow are in some places extremely high for this juncture of the season, although not record-breaking amounts. Particularly in the eastern Alps, such amounts of snowfall at intermediate and high altitudes occur only once every 10 to 40 years.
Weather outlook through Thursday, 29.10
On Wednesday in the northern regions, skies will be overcast by and large, accompanied by light precipitation and isolated bright intervals during the afternoon. The snowfall level will ascend to approximately 2100 m. In the inneralpine and the southern regions it is expected to become increasingly sunny. On Thursday in the northern regions, skies will be heavily overcast accompanied by precipitation. The snowfall level will descend down to 1600-1900 m. South of the Main Alpine Ridge it will be generally sunny. Winds will be blowing from westerly directions, at strong velocity on the northern flank of the Alps and at high altitudes in general, at light-to-moderate strength in the other regions of Switzerland.

Between Tuesday afternoon and Thursday afternoon, the following amounts of fresh snow are anticipated above approximately 2200 m:
  • central and eastern sectors of the northern flank of the Alps: 15 to 25 cm;
  • remaining regions of the northern flank of the Alps, furthermost western part of Lower Valais, Prättigau, northern Lower Engadine: 5 to 15 cm;
  • in the other regions of Switzerland, only a few centimetres, or else it will remain dry.
Outlook
On Friday it will be sunny for the most part. Temperatures will be significantly milder, the zero-degree level will ascend to over 3000 m, starting in the west. The danger of dry-snow avalanches will decrease. The danger of wet-snow avalanches is expected to increase during the course of the day, including at high altitudes. Zones where glide cracks are visible on the snowpack surface should continue to be circumvented.

Keep informed about the publication of unannounced Avalanche Bulletins. Activate in the App WhiteRisk the "Push Summer Bulletin". The SMS service "SLF Sommer" will be discontinued on 31.12.20.

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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Print versions of avalanche bulletin

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Measured values

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Weekly report

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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