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Avalanche bulletin through Monday, 20 January 2020

Considerable avalanche danger will be encountered in some regions

Edition: Su. 19.01., 17:00 Next update: Mo. 20.01., 08:00 Validity

Avalanche bulletin through Monday, 20 January 2020

Considerable avalanche danger will be encountered in some regions

Edition Su. 19.01., 17:00 Next update Mo. 20.01., 18:00 Validity

Avalanche bulletin through Monday, 20 January 2020

Considerable avalanche danger will be encountered in some regions

Edition Su. 19.01., 17:00 Next update Mo. 20.01., 08:00 Validity

Avalanche bulletin through Monday, 20 January 2020

Considerable avalanche danger will be encountered in some regions

Edition Su. 19.01., 17:00 Next update Mo. 20.01., 08:00 Validity

 
Level 3, considerable

Wind slabs

Avalanche prone locations
In particular in west to north to east facing aspects above approximately 1800m.

In particular in west to north to east facing aspects above approximately 1800m.

Danger description

As a consequence of southerly foehn wind, further wind slabs will form on Monday. Especially in regions exposed to the foehn wind avalanche prone locations are prevalent.
The fresh snow and wind slabs of the last few days are poorly bonded with the old snowpack. Avalanches can be released by a single winter sport participant and reach medium size. Backcountry touring calls for experience in the assessment of avalanche danger.

Gliding avalanches

Between approximately 2000 and 2600 m individual gliding avalanches are possible, in particular medium-sized ones. 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 1, low

Wind slabs

Isolated avalanche prone locations are to be found in particular in extremely steep terrain. In some localities small wind slabs formed. These are to be avoided in terrain where there is a danger of falling.

Gliding avalanches

Individual gliding avalanches are possible, but they will be mostly small.

see also snowpack and weather

Level 1, low

Dry avalanches: no distinct avalanche problem

Isolated avalanche prone locations are to be found in particular in extremely steep terrain. In some localities small wind slabs formed. These are to be avoided especially in terrain where there is a danger of falling.

Gliding avalanches

Between approximately 2000 and 2600 m individual gliding avalanches are possible, in particular medium-sized ones. 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 2, moderate

Wind slabs

Avalanche prone locations
In particular in southwest to north to southeast facing aspects above approximately 2000m.

In particular in southwest to north to southeast facing aspects above approximately 2000m.

Danger description

As a consequence of southerly wind, small wind slabs will form in some localities.
The fresh snow and wind slabs of the last few days are poorly bonded with the old snowpack in particular on wind-protected shady slopes. Avalanches can in some places be released easily, but they will be small in most cases.
Careful route selection is recommended.

Gliding avalanches

Between approximately 2000 and 2600 m individual gliding avalanches are possible, in particular medium-sized ones. 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 2, moderate

Wind slabs

Avalanche prone locations
In particular in southwest to north to southeast facing aspects above approximately 1600m.

In particular in southwest to north to southeast facing aspects above approximately 1600m.

Danger description

The strong Bise wind will transport the fresh snow. The wind slabs are prone to triggering. They are to be avoided in very steep terrain. Mostly avalanches are small.
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.

Gliding avalanches

Individual gliding avalanches are possible, but they will be mostly small.

see also snowpack and weather

Considerable avalanche danger will be encountered in some regions
Edition: 19.1.2020, 17:00 / Next update: 20.1.2020, 18:00
Snowpack
As a result of southerly foehn wind, the loosely-packed snow on the surface of the snowpack will be transported and snowdrift accumulations which are prone to triggering will be freshly generated. Both fresh snow and snowdrifts of the last few days were deposited on sunny slopes on top of a frequently favourable, rough-hewn old snowpack surface which in places was capable of bearing loads. However, particularly on wind-protected shady slopes, there is still a layer of expansively metamorphosed (faceted) snow crystals on the surface which is prone to triggering. Avalanches continue to be triggerable by persons.
In the inneralpine regions of the Valais and Grisons more than anywhere else, layers of soft, expansively metamorphosed (faceted) snow crystals are deeply embedded inside the snowpack. Nevertheless, for several weeks no avalanches have been registered as having released from these deeper down layers.
Gliding avalanches continue to be possible. These avalanches can release at any time of day or night.
Observed weather on Sunday, 19.01.2020
Skies in the western and the southern regions were predominantly clear on Saturday night. In the eastern regions skies were overcast and there was a small amount of snowfall. During the daytime on Sunday, it was generally sunny in western and southern regions. In the northern and eastern regions there was a small amount of snowfall extending down to low lying regions which fell from the cloud cover which resembed high fog.
Fresh snow
All in all between Friday midday and Sunday midday, the following amounts of fresh snow were registered above approximately 1400 m:
  • northern flank of the Alps not including Urseren, northern Lower Valais, Lötschental: 15 to 30 cm; in the eastern sector of the northern flank of the Alps as much as 40 cm from place to place;
  • Jura region, southern Lower Valais, northern and central Grisons, Silvretta, Samnaun: 10 to 20 cm;
  • in the other regions of Switzerland only a few centimetres; in the southern regions it remained for the most part dry.
Temperature
At midday at 2000 m, between -9 °C in the western regions and -11 °C in the eastern and southern regions, -7 °C.
Wind
  • Jura region, western Prealps: moderate to strong-velocity bise wind;
  • in the othern regions of Switzerland, light to moderate winds from northerly to northeasterly directions.
Weather forecast through Monday, 20.01.2020
During the night in the northern and eastern regions, a small amount of snowfall is expected down to low lying areas. During the daytime it will be sunny in the mountains. In the morning in the northern regions, high fog will prevail with the upper borderline at 1600 m. In some parts of the southern regions, cloudbanks will move in.
Fresh snow
-
Temperature
At midday at 2000 m, -6 °C in the northern regions and -9 °C in the southern regions.
Wind
  • During the night: in the Jura region and the Prealps, moderate to strong-velocity bise wind, elsewhere light to moderate northerly winds, shifting to southerly;
  • during the daytime: moderate southerly winds at high altitudes, moderate to strong-velocity foehn wind in the Alpine valleys of the north.
Outlook through Wednesday, 22.01.2020
It is expected to be predominantly sunny in the mountains, accompanied by cloudbanks and rising temperatures. The danger of dry-snow avalanches will incrementally decrease. Isolated gliding avalanches continue to be possible.
 

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 in some regions
Edition: 19.1.2020, 17:00 / Next update: 20.1.2020, 18:00
Snowpack
As a result of southerly foehn wind, the loosely-packed snow on the surface of the snowpack will be transported and snowdrift accumulations which are prone to triggering will be freshly generated. Both fresh snow and snowdrifts of the last few days were deposited on sunny slopes on top of a frequently favourable, rough-hewn old snowpack surface which in places was capable of bearing loads. However, particularly on wind-protected shady slopes, there is still a layer of expansively metamorphosed (faceted) snow crystals on the surface which is prone to triggering. Avalanches continue to be triggerable by persons.
In the inneralpine regions of the Valais and Grisons more than anywhere else, layers of soft, expansively metamorphosed (faceted) snow crystals are deeply embedded inside the snowpack. Nevertheless, for several weeks no avalanches have been registered as having released from these deeper down layers.
Gliding avalanches continue to be possible. These avalanches can release at any time of day or night.
Observed weather on Sunday, 19.01.2020
Skies in the western and the southern regions were predominantly clear on Saturday night. In the eastern regions skies were overcast and there was a small amount of snowfall. During the daytime on Sunday, it was generally sunny in western and southern regions. In the northern and eastern regions there was a small amount of snowfall extending down to low lying regions which fell from the cloud cover which resembed high fog.
Fresh snow
All in all between Friday midday and Sunday midday, the following amounts of fresh snow were registered above approximately 1400 m:
  • northern flank of the Alps not including Urseren, northern Lower Valais, Lötschental: 15 to 30 cm; in the eastern sector of the northern flank of the Alps as much as 40 cm from place to place;
  • Jura region, southern Lower Valais, northern and central Grisons, Silvretta, Samnaun: 10 to 20 cm;
  • in the other regions of Switzerland only a few centimetres; in the southern regions it remained for the most part dry.
Temperature
At midday at 2000 m, between -9 °C in the western regions and -11 °C in the eastern and southern regions, -7 °C.
Wind
  • Jura region, western Prealps: moderate to strong-velocity bise wind;
  • in the othern regions of Switzerland, light to moderate winds from northerly to northeasterly directions.
Weather forecast through Monday, 20.01.2020
During the night in the northern and eastern regions, a small amount of snowfall is expected down to low lying areas. During the daytime it will be sunny in the mountains. In the morning in the northern regions, high fog will prevail with the upper borderline at 1600 m. In some parts of the southern regions, cloudbanks will move in.
Fresh snow
-
Temperature
At midday at 2000 m, -6 °C in the northern regions and -9 °C in the southern regions.
Wind
  • During the night: in the Jura region and the Prealps, moderate to strong-velocity bise wind, elsewhere light to moderate northerly winds, shifting to southerly;
  • during the daytime: moderate southerly winds at high altitudes, moderate to strong-velocity foehn wind in the Alpine valleys of the north.
Outlook through Wednesday, 22.01.2020
It is expected to be predominantly sunny in the mountains, accompanied by cloudbanks and rising temperatures. The danger of dry-snow avalanches will incrementally decrease. Isolated gliding avalanches continue to be possible.

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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.

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;
  • 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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