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Avalanche bulletin through Friday, 30 September 2022

Striking onset of winter, snowfall down to below 2000 m

Edition: Mo. 26.09., 17:00 Next update: In the event of heavy snowfall Validity

Avalanche bulletin through Friday, 30 September 2022

Striking onset of winter, snowfall down to below 2000 m

Edition Mo. 26.09., 17:00 Next update In the event of heavy snowfall Validity

Avalanche bulletin through Friday, 30 September 2022

Striking onset of winter, snowfall down to below 2000 m

Edition Mo. 26.09., 17:00 Next update In the event of heavy snowfall Validity

Avalanche bulletin through Friday, 30 September 2022

Striking onset of winter, snowfall down to below 2000 m

Edition Mo. 26.09., 17:00 Next update In the event of heavy snowfall Validity

  
Striking onset of winter, snowfall down to below 2000 m
Edition: 26.9.2022, 17:00 / Next update: In the event of heavy snowfall
Avalanche danger
Lower Valais, northern Alpine Ridge
Avalanche danger will increase over the next few days.
Above approximately 2500 m, considerable danger of dry-snow slab avalanches can be assumed to prevail starting on Wednesday. The avalanche prone locations are found particularly on wind-loaded slopes and especially wherever there was old snow already on the ground. One single person can trigger an avalanche, and to an increasing extent even medium-sized and large-sized avalanches. Starting on Wednesday, naturally triggered avalanches will also be possible. From high-altitude avalanche starting zones, these can in isolated cases grow to large size and in the typical avalanche plummet paths even penetrate as far down as intermediate altitude zones. On mountain tours, experience and caution are indispensable.
Below approximately 2500 m, the major danger stems from wet-snow and glide-snow avalanches. The avalanche prone locations are found particularly on smooth grassy meadows and rock plates in all aspects. Avalanches can expand to medium size, sweep persons along in their path and force them to take a fall. In the case of hikers, bikers and hunters, a high degree of caution is urged especially in exposed terrain. High-altitude, exposed transportation routes can in isolated cases be put at risk by hillside snowslides.
Remaining regions not including southern flank of the Alps
Above approximately 2500 m, the major danger stems from dry-snow slab avalanches. Avalanches can be triggered even by one single person. These releases tend to be predominantly small sized, but can sweep persons along in their path and force them to take a fall. Caution is urged on wind-loaded slopes above all else.
Below approximately 2500 m, mostly small-sized glide-snow or wet-snow slides are possible. Caution is urged in exposed terrain in particular.
Southern flank of the Alps
Isolated avalanche prone locations are found in high alpine regions in extremely steep terrain.
Snow and weather
Snowpack
At intermediate and high altitudes, the fresh fallen snow over widespread areas was deposited on bare ground. In high alpine regions and there in particular in glaciated terrain, prior to this bout of snowfall there was already a shallow, cohesive, area-wide snowpack from the precipitation in August and September. In addition, the prognosticated snowfall fell in a series of rounds, with a number of interims in the precipitation. For that reason, at high altitudes a snowpack is likely to develop which to an increasing degree will comprise a variety of layers.
Weather review to Saturday, 24 September
Since Saturday there has been intermittent precipitation registered. The snowfall level descended from 2500 m down to just below 2000 m. In northern Grisons and in the Lower Engadine, there was 10 to 25 cm of fresh snow registered, in the remaining regions only a few centimetres of fresh snow.
Weather outlook through Friday, 30 September
From Monday through Friday, batches of moist air will be accumulated and dammed up against the northern flank of the Alps, arriving in several bouts of precipitation. The precipitation will frequently be intensive, particularly on Wednesday in the western and in the northern regions. The snowfall level is expected to descend on Tuesday down to 1400 to 1700 m, subsequently ascend on Wednesday in the western regions to nearly 2400 m temporarily, in the eastern regions to nearly 2000 m temporarily. On Thursday and on Friday, the snowfall level will lie at approximataely 1600 m in the northern regions and at 2000 m in the southern regions. By Friday evening, the following amounts of fresh fallen snow are anticipated above approximtely 2500 m:
  • Furthermost western part of Lower Valais, northern Alpine Ridge from Les Diablerets into the Bernese Alps: 60 to 80 cm;
  • remaining parts of Lower Valais, northern Alpine Ridge from the Bernese Alps into Liechtenstein: 40 to 60 cm;
  • remaining regions of Switzerland: 20 to 40 cm, on the southern flank of the Alps only a few centimetres or it will remain dry.
In the high alpine regions it is anticipated that the amounts of snowfall will be significantly greater, in the western and northern regions as much as a metre of fresh snow can be expected from place to place. At high altitudes on Thursday, a strong to storm-velocity westerly wind will be blowing. On Friday the wind will decrease in intensity and shift to southerly directions.
Outlook
Next weekend, further rounds of precipitation are expected. Depending on the amount of actual precipitation, the avalanche danger levels can be expected to increase anew. If necessary, a separate Avalanche Bulletin will be published to describe and explain the situation.

Keep informed about the publication of unannounced Avalanche Bulletins. Activate in the App WhiteRisk the "Push Summer Bulletin".
Striking onset of winter, snowfall down to below 2000 m
Edition: 26.9.2022, 17:00 / Next update: In the event of heavy snowfall
Avalanche danger
Lower Valais, northern Alpine Ridge
Avalanche danger will increase over the next few days.
Above approximately 2500 m, considerable danger of dry-snow slab avalanches can be assumed to prevail starting on Wednesday. The avalanche prone locations are found particularly on wind-loaded slopes and especially wherever there was old snow already on the ground. One single person can trigger an avalanche, and to an increasing extent even medium-sized and large-sized avalanches. Starting on Wednesday, naturally triggered avalanches will also be possible. From high-altitude avalanche starting zones, these can in isolated cases grow to large size and in the typical avalanche plummet paths even penetrate as far down as intermediate altitude zones. On mountain tours, experience and caution are indispensable.
Below approximately 2500 m, the major danger stems from wet-snow and glide-snow avalanches. The avalanche prone locations are found particularly on smooth grassy meadows and rock plates in all aspects. Avalanches can expand to medium size, sweep persons along in their path and force them to take a fall. In the case of hikers, bikers and hunters, a high degree of caution is urged especially in exposed terrain. High-altitude, exposed transportation routes can in isolated cases be put at risk by hillside snowslides.
Remaining regions not including southern flank of the Alps
Above approximately 2500 m, the major danger stems from dry-snow slab avalanches. Avalanches can be triggered even by one single person. These releases tend to be predominantly small sized, but can sweep persons along in their path and force them to take a fall. Caution is urged on wind-loaded slopes above all else.
Below approximately 2500 m, mostly small-sized glide-snow or wet-snow slides are possible. Caution is urged in exposed terrain in particular.
Southern flank of the Alps
Isolated avalanche prone locations are found in high alpine regions in extremely steep terrain.
Snow and weather
Snowpack
At intermediate and high altitudes, the fresh fallen snow over widespread areas was deposited on bare ground. In high alpine regions and there in particular in glaciated terrain, prior to this bout of snowfall there was already a shallow, cohesive, area-wide snowpack from the precipitation in August and September. In addition, the prognosticated snowfall fell in a series of rounds, with a number of interims in the precipitation. For that reason, at high altitudes a snowpack is likely to develop which to an increasing degree will comprise a variety of layers.
Weather review to Saturday, 24 September
Since Saturday there has been intermittent precipitation registered. The snowfall level descended from 2500 m down to just below 2000 m. In northern Grisons and in the Lower Engadine, there was 10 to 25 cm of fresh snow registered, in the remaining regions only a few centimetres of fresh snow.
Weather outlook through Friday, 30 September
From Monday through Friday, batches of moist air will be accumulated and dammed up against the northern flank of the Alps, arriving in several bouts of precipitation. The precipitation will frequently be intensive, particularly on Wednesday in the western and in the northern regions. The snowfall level is expected to descend on Tuesday down to 1400 to 1700 m, subsequently ascend on Wednesday in the western regions to nearly 2400 m temporarily, in the eastern regions to nearly 2000 m temporarily. On Thursday and on Friday, the snowfall level will lie at approximataely 1600 m in the northern regions and at 2000 m in the southern regions. By Friday evening, the following amounts of fresh fallen snow are anticipated above approximtely 2500 m:
  • Furthermost western part of Lower Valais, northern Alpine Ridge from Les Diablerets into the Bernese Alps: 60 to 80 cm;
  • remaining parts of Lower Valais, northern Alpine Ridge from the Bernese Alps into Liechtenstein: 40 to 60 cm;
  • remaining regions of Switzerland: 20 to 40 cm, on the southern flank of the Alps only a few centimetres or it will remain dry.
In the high alpine regions it is anticipated that the amounts of snowfall will be significantly greater, in the western and northern regions as much as a metre of fresh snow can be expected from place to place. At high altitudes on Thursday, a strong to storm-velocity westerly wind will be blowing. On Friday the wind will decrease in intensity and shift to southerly directions.
Outlook
Next weekend, further rounds of precipitation are expected. Depending on the amount of actual precipitation, the avalanche danger levels can be expected to increase anew. If necessary, a separate Avalanche Bulletin will be published to describe and explain the situation.

Keep informed about the publication of unannounced Avalanche Bulletins. Activate in the App WhiteRisk the "Push Summer Bulletin".
 

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:

Striking onset of winter, snowfall down to below 2000 m
Edition: 26.9.2022, 17:00 / Next update: In the event of heavy snowfall
Avalanche danger
Lower Valais, northern Alpine Ridge
Avalanche danger will increase over the next few days.
Above approximately 2500 m, considerable danger of dry-snow slab avalanches can be assumed to prevail starting on Wednesday. The avalanche prone locations are found particularly on wind-loaded slopes and especially wherever there was old snow already on the ground. One single person can trigger an avalanche, and to an increasing extent even medium-sized and large-sized avalanches. Starting on Wednesday, naturally triggered avalanches will also be possible. From high-altitude avalanche starting zones, these can in isolated cases grow to large size and in the typical avalanche plummet paths even penetrate as far down as intermediate altitude zones. On mountain tours, experience and caution are indispensable.
Below approximately 2500 m, the major danger stems from wet-snow and glide-snow avalanches. The avalanche prone locations are found particularly on smooth grassy meadows and rock plates in all aspects. Avalanches can expand to medium size, sweep persons along in their path and force them to take a fall. In the case of hikers, bikers and hunters, a high degree of caution is urged especially in exposed terrain. High-altitude, exposed transportation routes can in isolated cases be put at risk by hillside snowslides.
Remaining regions not including southern flank of the Alps
Above approximately 2500 m, the major danger stems from dry-snow slab avalanches. Avalanches can be triggered even by one single person. These releases tend to be predominantly small sized, but can sweep persons along in their path and force them to take a fall. Caution is urged on wind-loaded slopes above all else.
Below approximately 2500 m, mostly small-sized glide-snow or wet-snow slides are possible. Caution is urged in exposed terrain in particular.
Southern flank of the Alps
Isolated avalanche prone locations are found in high alpine regions in extremely steep terrain.
Snow and weather
Snowpack
At intermediate and high altitudes, the fresh fallen snow over widespread areas was deposited on bare ground. In high alpine regions and there in particular in glaciated terrain, prior to this bout of snowfall there was already a shallow, cohesive, area-wide snowpack from the precipitation in August and September. In addition, the prognosticated snowfall fell in a series of rounds, with a number of interims in the precipitation. For that reason, at high altitudes a snowpack is likely to develop which to an increasing degree will comprise a variety of layers.
Weather review to Saturday, 24 September
Since Saturday there has been intermittent precipitation registered. The snowfall level descended from 2500 m down to just below 2000 m. In northern Grisons and in the Lower Engadine, there was 10 to 25 cm of fresh snow registered, in the remaining regions only a few centimetres of fresh snow.
Weather outlook through Friday, 30 September
From Monday through Friday, batches of moist air will be accumulated and dammed up against the northern flank of the Alps, arriving in several bouts of precipitation. The precipitation will frequently be intensive, particularly on Wednesday in the western and in the northern regions. The snowfall level is expected to descend on Tuesday down to 1400 to 1700 m, subsequently ascend on Wednesday in the western regions to nearly 2400 m temporarily, in the eastern regions to nearly 2000 m temporarily. On Thursday and on Friday, the snowfall level will lie at approximataely 1600 m in the northern regions and at 2000 m in the southern regions. By Friday evening, the following amounts of fresh fallen snow are anticipated above approximtely 2500 m:
  • Furthermost western part of Lower Valais, northern Alpine Ridge from Les Diablerets into the Bernese Alps: 60 to 80 cm;
  • remaining parts of Lower Valais, northern Alpine Ridge from the Bernese Alps into Liechtenstein: 40 to 60 cm;
  • remaining regions of Switzerland: 20 to 40 cm, on the southern flank of the Alps only a few centimetres or it will remain dry.
In the high alpine regions it is anticipated that the amounts of snowfall will be significantly greater, in the western and northern regions as much as a metre of fresh snow can be expected from place to place. At high altitudes on Thursday, a strong to storm-velocity westerly wind will be blowing. On Friday the wind will decrease in intensity and shift to southerly directions.
Outlook
Next weekend, further rounds of precipitation are expected. Depending on the amount of actual precipitation, the avalanche danger levels can be expected to increase anew. If necessary, a separate Avalanche Bulletin will be published to describe and explain the situation.

Keep informed about the publication of unannounced Avalanche Bulletins. Activate in the App WhiteRisk the "Push Summer Bulletin".

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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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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