Navigation mit Access Keys

SLF HomeAvalanche bulletin and snow situation

Main menu

 

Avalanche bulletin for Wednesday, 24 January 2018

Considerable avalanche danger will be encountered over a wide area

Edition: We. 24.01., 08:00 Next update: We. 24.01., 17:00 Validity

Avalanche bulletin for Wednesday, 24 January 2018

Considerable avalanche danger will be encountered over a wide area

Edition Tu. 23.01., 17:00 Next update We. 24.01., 18:00 Validity

Avalanche bulletin for Wednesday, 24 January 2018

Considerable avalanche danger will be encountered over a wide area

Edition We. 24.01., 08:00 Next update We. 24.01., 17:00 Validity

Avalanche bulletin for Wednesday, 24 January 2018

Considerable avalanche danger will be encountered over a wide area

Edition We. 24.01., 08:00 Next update We. 24.01., 17:00 Validity

 
Level 2, moderate

Snow drifts

Avalanche prone locations
In all aspects above approximately 1800m.

In all aspects above approximately 1800m.

Danger description

The snow drift accumulations of the last few days are in some cases still prone to triggering. They are to be evaluated with care and prudence in steep terrain. Careful route selection is recommended.

see also snowpack and weather

Level 3, considerable

Fresh snow and snow drifts, old snow

Avalanche prone locations
In all aspects above approximately 2000m.

In all aspects above approximately 2000m.

Danger description

The fresh snow and snow drift accumulations are prone to triggering. Whumpfing sounds and the formation of shooting cracks when stepping on the snowpack can indicate the danger. Avalanches can be released, even by a single winter sport participant. They can penetrate deep layers and reach dangerously large size.
Snow sport activities outside marked and open pistes call for extensive experience in the assessment of avalanche danger and great restraint.

Full-depth avalanches

Below approximately 2200 m full-depth avalanches are to be expected. This applies in all aspects. They can be released at any time of day or night. Areas with glide cracks are to be avoided as far as possible.

see also snowpack and weather

Level 3, considerable

Fresh snow and snow drifts

Avalanche prone locations
In all aspects above approximately 2000m.

In all aspects above approximately 2000m.

Danger description

Avalanches can be released in near-surface layers by people. Fresh and somewhat older snow drift accumulations are to be evaluated with care and prudence.
In very isolated cases avalanches can also be triggered in deep layers and reach dangerously large size. Caution is to be exercised in areas where the snow cover is rather shallow. Careful route selection and spacing between individuals are recommended.
Backcountry touring and other off-piste activities call for experience in the assessment of avalanche danger.

Full-depth avalanches

Below approximately 2200 m full-depth avalanches are to be expected, including quite large ones. This applies in all aspects. They can be released at any time of day or night. Exposed parts of transportation routes can be endangered. Areas with glide cracks are to be avoided.
On rocky sunny slopes moist snow slides are to be expected.

see also snowpack and weather

Level 2, moderate

Full-depth avalanches

Avalanche prone locations
In all aspects at all altitudes.

In all aspects at all altitudes.

Danger description

In all aspects full-depth avalanches are to be expected, including quite large ones. They can be released at any time of day or night. Areas with glide cracks are to be avoided as far as possible.

Fresh snow and snow drifts

The fresh snow and snow drift accumulations of the last few days are in some cases still prone to triggering at elevated altitudes. This applies in particular in case of a large load. Caution is to be exercised at transitions from a shallow to a deep snowpack.

see also snowpack and weather

Level 1, low

A favourable avalanche situation will prevail. Individual avalanche prone locations are to be found in particular in extremely steep terrain. Restraint should be exercised because avalanches can sweep people along and give rise to falls.

see also snowpack and weather

Considerable avalanche danger will be encountered over a wide area
Edition: 23.1.2018, 17:00 / Next update: 24.1.2018, 18:00
Snowpack
During a precipitation period lasting one week, enormous quantities of snow have fallen everywhere except in the far south. Some stations measured greater aggregated 7-day fresh snow depths than ever before. Westerly to northwesterly winds that were frequently strong have transported large quantities of snow. On Monday the snowfall level rose to 2000 to 2200 m over a wide area. In many regions numerous large and isolated very large avalanches were released. The ending of the precipitation period coincided with a significant decrease in natural avalanche activity. The stability of the deep snowpack is increasing quickly. Avalanches releasing all the layers of fresh and drifted snow that were deposited last week are now possible only in isolated cases. If such avalanches should occur, however, they can reach a dangerously large size.
Less snow fell towards the south. In central Grisons, Upper Engadine and the Grisons southern valleys the old snowpack is weaker, so that avalanches can penetrate near-ground layers in isolated cases.
Throughout Switzerland snow depths are well above average for the time of year. At high altitudes in southern Valais, northern Grisons and northern Lower Engadine, in some cases they are close to the extreme values measured at the end of February 1999.
Observed weather on Tuesday, 23.01.2018
During the night snow continued to fall everywhere except in the far south. The snowfall level was approximately 2000 to 2200 m at first and then fell. During the day the weather became quite sunny in the mountains. Below approximately 2000 m there was fog in the north, but it dispersed partially in the west as the day progressed.
Fresh snow
On Monday night 20 to 30 cm of snow fell north of a line between the Rhone and Rhine and in Lower Engadine, but the quantities were smaller further south. This marked the end of a one-week precipitation period, during which the following aggregate amounts of snow fell above approximately 2000 m:
  • Northern Alpine ridge, Valais, Gotthard region, Davos, Silvretta and Samnaun: 2 to 3 m over a wide area, but even more in some places in the Glarus Alps and northern Lower Valais
  • Remaining regions on the northern flank of the Alps, and remaining regions of northern Ticino, of northern and central Grisons, and of Lower Engadine: 1 to 2 m
  • Central Ticino, Upper Engadine, Val Müstair: 50 to 100 cm, smaller amounts elsewhere
  • In the Jura most of the fresh snow has since been melted by rain
Temperature
At midday at 2000 m: between -3 °C in the north and +3 °C in the south
Wind
  • During the first half of the night, storm force at times from the west
  • During the day in Grisons and in the morning on the northern Alpine ridge, strong at times, otherwise light to moderate from the north
Weather forecast through Wednesday, 24.01.2018
In the mountains it will be sunny and mild.
Fresh snow
-
Temperature
At midday at 2000 m: between +5 °C in the north and +1 °C in the south
Wind
The wind will veer southwesterly and be mostly moderate. In the afternoon a moderate foehn wind will gradually develop.
Outlook through Friday, 26.01.2018
Thursday
It will remain fairly sunny at first. During the day cloud will build up from the west and south. There will be a strong wind from the southwest, and a foehn wind in the northern valleys. Fresh snow drift accumulations will pose the main avalanche danger. Gliding avalanches are also to be expected; these can be fairly large in the regions with a lot of snow.
Friday
During the night the southwesterly wind, and the foehn wind in the northern valleys, will persist. During the day the wind in the northern regions will veer northeasterly. It will be very cloudy everywhere and precipitation will fall over a wide area. The precipitation will be concentrated in the south, but the amounts remain uncertain. The danger of dry avalanches is likely to increase significantly in the south and a little in the north. Gliding avalanches are still to be expected; these can be fairly large in the regions with a lot of snow.
 

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:

Considerable avalanche danger will be encountered over a wide area
Edition: 23.1.2018, 17:00 / Next update: 24.1.2018, 18:00
Snowpack
During a precipitation period lasting one week, enormous quantities of snow have fallen everywhere except in the far south. Some stations measured greater aggregated 7-day fresh snow depths than ever before. Westerly to northwesterly winds that were frequently strong have transported large quantities of snow. On Monday the snowfall level rose to 2000 to 2200 m over a wide area. In many regions numerous large and isolated very large avalanches were released. The ending of the precipitation period coincided with a significant decrease in natural avalanche activity. The stability of the deep snowpack is increasing quickly. Avalanches releasing all the layers of fresh and drifted snow that were deposited last week are now possible only in isolated cases. If such avalanches should occur, however, they can reach a dangerously large size.
Less snow fell towards the south. In central Grisons, Upper Engadine and the Grisons southern valleys the old snowpack is weaker, so that avalanches can penetrate near-ground layers in isolated cases.
Throughout Switzerland snow depths are well above average for the time of year. At high altitudes in southern Valais, northern Grisons and northern Lower Engadine, in some cases they are close to the extreme values measured at the end of February 1999.
Observed weather on Tuesday, 23.01.2018
During the night snow continued to fall everywhere except in the far south. The snowfall level was approximately 2000 to 2200 m at first and then fell. During the day the weather became quite sunny in the mountains. Below approximately 2000 m there was fog in the north, but it dispersed partially in the west as the day progressed.
Fresh snow
On Monday night 20 to 30 cm of snow fell north of a line between the Rhone and Rhine and in Lower Engadine, but the quantities were smaller further south. This marked the end of a one-week precipitation period, during which the following aggregate amounts of snow fell above approximately 2000 m:
  • Northern Alpine ridge, Valais, Gotthard region, Davos, Silvretta and Samnaun: 2 to 3 m over a wide area, but even more in some places in the Glarus Alps and northern Lower Valais
  • Remaining regions on the northern flank of the Alps, and remaining regions of northern Ticino, of northern and central Grisons, and of Lower Engadine: 1 to 2 m
  • Central Ticino, Upper Engadine, Val Müstair: 50 to 100 cm, smaller amounts elsewhere
  • In the Jura most of the fresh snow has since been melted by rain
Temperature
At midday at 2000 m: between -3 °C in the north and +3 °C in the south
Wind
  • During the first half of the night, storm force at times from the west
  • During the day in Grisons and in the morning on the northern Alpine ridge, strong at times, otherwise light to moderate from the north
Weather forecast through Wednesday, 24.01.2018
In the mountains it will be sunny and mild.
Fresh snow
-
Temperature
At midday at 2000 m: between +5 °C in the north and +1 °C in the south
Wind
The wind will veer southwesterly and be mostly moderate. In the afternoon a moderate foehn wind will gradually develop.
Outlook through Friday, 26.01.2018
Thursday
It will remain fairly sunny at first. During the day cloud will build up from the west and south. There will be a strong wind from the southwest, and a foehn wind in the northern valleys. Fresh snow drift accumulations will pose the main avalanche danger. Gliding avalanches are also to be expected; these can be fairly large in the regions with a lot of snow.
Friday
During the night the southwesterly wind, and the foehn wind in the northern valleys, will persist. During the day the wind in the northern regions will veer northeasterly. It will be very cloudy everywhere and precipitation will fall over a wide area. The precipitation will be concentrated in the south, but the amounts remain uncertain. The danger of dry avalanches is likely to increase significantly in the south and a little in the north. Gliding avalanches are still to be expected; these can be fairly large in the regions with a lot of snow.

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:

Europäische Lawinengefahrenskala mit Empfehlungen