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Avalanche bulletin through Tuesday, 21 November 2017

Moderate avalanche danger will be encountered over a wide area. Snow drifts and weakly bonded old snow require caution

Edition: Mo. 20.11.2017, 17:00 Next update: Tu. 21.11.2017, 17:00 Validity

Avalanche bulletin through Tuesday, 21 November 2017

Moderate avalanche danger will be encountered over a wide area. Snow drifts and weakly bonded old snow require caution

Edition Mo. 20.11.2017, 17:00 Next update Tu. 21.11.2017, 18:00 Validity

Avalanche bulletin through Tuesday, 21 November 2017

Moderate avalanche danger will be encountered over a wide area. Snow drifts and weakly bonded old snow require caution

Edition Mo. 20.11.2017, 17:00 Next update Tu. 21.11.2017, 17:00 Validity

Avalanche bulletin through Tuesday, 21 November 2017

Moderate avalanche danger will be encountered over a wide area. Snow drifts and weakly bonded old snow require caution

Edition Mo. 20.11.2017, 17:00 Next update Tu. 21.11.2017, 17:00 Validity

 
Level 2, moderate

Snow drifts, old snow

Avalanche prone locations
In all aspects above approximately 2000m.

In all aspects above approximately 2000m.

Danger description

The snow drift accumulations of the last few days are poorly bonded with the old snowpack. They can in some cases be released by a single winter sport participant, but they will be small in most cases. At elevated altitudes the prevalence and size of the avalanche prone locations will increase. The snow drift accumulations are covered with fresh snow in some cases and therefore difficult to recognise.
Avalanches can in very isolated cases penetrate deep layers and reach medium size. This applies in particular on steep shady slopes.
Backcountry touring and other off-piste activities call for defensive route selection.

Full-depth avalanches

On steep grassy slopes full-depth avalanches are possible. Areas with glide cracks are to be avoided as far as possible.

Remarks

The Avalanche Warning Service currently has only a small amount of information that has been collected in the field, so that the avalanche danger should be investigated especially thoroughly in the relevant locality.

see also snowpack and weather

Level 2, moderate

Snow drifts, old snow

Avalanche prone locations
In particular in northwest to north to south facing aspects above approximately 2200m.

In particular in northwest to north to south facing aspects above approximately 2200m.

Danger description

The snow drift accumulations of the last few days represent the main danger. These are to be found in particular in gullies and bowls, and behind abrupt changes in the terrain. They are rather small but can in some cases be released easily. The snow drift accumulations are clearly recognisable to the trained eye. They are to be avoided in steep terrain.
Additionally in isolated cases avalanches can be released in the old snowpack. Caution is to be exercised in particular at transitions from a shallow to a deep snowpack. These avalanche prone locations are barely recognisable, even to the trained eye. They are to be found in particular on very steep shady slopes. Defensive route selection is recommended.

Remarks

The Avalanche Warning Service currently has only a small amount of information that has been collected in the field, so that the avalanche danger should be investigated especially thoroughly in the relevant locality.

see also snowpack and weather

Level 2, moderate

Snow drifts, old snow

Avalanche prone locations
In particular in northwest to north to south facing aspects above approximately 1800m.

In particular in northwest to north to south facing aspects above approximately 1800m.

Danger description

The snow drift accumulations of the last few days are lying on the unfavourable surface of an old snowpack in particular on north and east facing slopes. They are rather small but can in some cases be released easily. The snow drift accumulations are clearly recognisable to the trained eye. They are to be avoided in steep terrain. Apart from the danger of being buried, restraint should be exercised also in view of the danger of avalanches sweeping people along and giving rise to falls.

Full-depth avalanches

On steep grassy slopes full-depth avalanches are possible. Areas with glide cracks are to be avoided as far as possible.

Remarks

The Avalanche Warning Service currently has only a small amount of information that has been collected in the field, so that the avalanche danger should be investigated especially thoroughly in the relevant locality.

see also snowpack and weather

Level 1, low

From a snow sport perspective, in most cases insufficient snow is lying. Individual avalanche prone locations are to be found in particular in extremely steep terrain. 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.

see also snowpack and weather

Moderate avalanche danger will be encountered over a wide area. Snow drifts and weakly bonded old snow require caution
Edition: 20.11.2017, 17:00 / Next update: 21.11.2017, 18:00
Snowpack
The fresh snow of the last few days and also to some extent the loosely-packed older snow have been transported by strong-velocity northwesterly winds. Particularly where the snowdrift accumulations were deposited on top of surface hoar or atop a soft snowpack surface consisting of faceted snow crystals, the drifts are still prone to triggering.
The Avalanche Warning Service does not yet have sufficient information available to it as regards the composition of the snowpack. However the existing measurements demonstrate that the old snow cover is comprised in part of weak layers of faceted crystals and, from place to place, older surface hoar which has now been covered by newer snow. In isolated cases avalanches can trigger from these more deeply embedded layers.
At 2000 m altitude, the following approximate amounts of snow lie on the ground:
  • northern Alpine Ridge and northern part of Prättigau: 50 to 80 cm, from Titlis into the Glarner Alps as much as 100 cm;
  • remaining regions of Switzerland: 20 to 50 over widespread areas; in the valleys of Visp in central Ticino, in Sotto Ceneri, in parts of the Engadine and in the southern valleys of Grisons, less.
Observed weather on Monday, 20.11.2017
On Monday in northern and in eastern regions, skies were heavily overcast for the most part. In eastern regions there was an additional amount of snowfall: 5 to 10 cm above 1200 m. In western and in southern regions it was predominantly sunny, accompanied by cloudbanks during the course of the day.
Fresh snow
Between Saturday evening and Monday afternoon above approximately 1200 m, the following amounts of fresh snow were registered:
  • northern Alpine Ridge from the Gemmi into Liechtenstein, upper valleys of Visp, Gotthard region, northern Grisons, Lower Engadine north of the Inn: 15 to 30 cm;
  • remaining regions of Switzerland: 5 to 15 cm; in the furthermost southern regions it remained dry.
Temperature
At midday at 2000 m, between +4 °C in western and southern regions and -3 °C in eastern regions.
Wind
In the Prealps and the furthermost southern regions winds were light to moderate, elsewhere blowing at moderate to strong velocity, from westerly to northerly directions.
Weather forecast through Tuesday, 21.11.2017
During the night in eastern regions above approximately 1500 m, a small amount of additional snowfall is anticipated. During the daytime it will be predominantly sunny in western and southern regions, increasingly so in eastern regions.
Fresh snow
Eastern sector of the northern flank of the Alps, Prättigau, Lower Engadine north of the Inn: maximum 5 cm.
Temperature
At midday at 2000 m, between +3 °C in western and southern regions and 0 °C in eastern regions.
Wind
Winds will be blowing at moderate to strong velocity from the northwest.
Outlook through Thursday, 23.11.2017
Wednesday
It will be sunny and, in the mountains, mild. The zero-degree level is expected to ascend to 3000 m. The hazards of dry-snow avalanches will decrease. Moist sluffs are possible in the northern and eastern regions more than anywhere else.
Thursday
To begin with it will be sunny and mild. During the course of the day, clouds will move in from the west. The avalanche danger levels are not expected to change significantly. As a result of intensifying southwesterly winds, fresh snowdrift accumulations can be expected to form from place to place.
 

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:

Moderate avalanche danger will be encountered over a wide area. Snow drifts and weakly bonded old snow require caution
Edition: 20.11.2017, 17:00 / Next update: 21.11.2017, 18:00
Snowpack
The fresh snow of the last few days and also to some extent the loosely-packed older snow have been transported by strong-velocity northwesterly winds. Particularly where the snowdrift accumulations were deposited on top of surface hoar or atop a soft snowpack surface consisting of faceted snow crystals, the drifts are still prone to triggering.
The Avalanche Warning Service does not yet have sufficient information available to it as regards the composition of the snowpack. However the existing measurements demonstrate that the old snow cover is comprised in part of weak layers of faceted crystals and, from place to place, older surface hoar which has now been covered by newer snow. In isolated cases avalanches can trigger from these more deeply embedded layers.
At 2000 m altitude, the following approximate amounts of snow lie on the ground:
  • northern Alpine Ridge and northern part of Prättigau: 50 to 80 cm, from Titlis into the Glarner Alps as much as 100 cm;
  • remaining regions of Switzerland: 20 to 50 over widespread areas; in the valleys of Visp in central Ticino, in Sotto Ceneri, in parts of the Engadine and in the southern valleys of Grisons, less.
Observed weather on Monday, 20.11.2017
On Monday in northern and in eastern regions, skies were heavily overcast for the most part. In eastern regions there was an additional amount of snowfall: 5 to 10 cm above 1200 m. In western and in southern regions it was predominantly sunny, accompanied by cloudbanks during the course of the day.
Fresh snow
Between Saturday evening and Monday afternoon above approximately 1200 m, the following amounts of fresh snow were registered:
  • northern Alpine Ridge from the Gemmi into Liechtenstein, upper valleys of Visp, Gotthard region, northern Grisons, Lower Engadine north of the Inn: 15 to 30 cm;
  • remaining regions of Switzerland: 5 to 15 cm; in the furthermost southern regions it remained dry.
Temperature
At midday at 2000 m, between +4 °C in western and southern regions and -3 °C in eastern regions.
Wind
In the Prealps and the furthermost southern regions winds were light to moderate, elsewhere blowing at moderate to strong velocity, from westerly to northerly directions.
Weather forecast through Tuesday, 21.11.2017
During the night in eastern regions above approximately 1500 m, a small amount of additional snowfall is anticipated. During the daytime it will be predominantly sunny in western and southern regions, increasingly so in eastern regions.
Fresh snow
Eastern sector of the northern flank of the Alps, Prättigau, Lower Engadine north of the Inn: maximum 5 cm.
Temperature
At midday at 2000 m, between +3 °C in western and southern regions and 0 °C in eastern regions.
Wind
Winds will be blowing at moderate to strong velocity from the northwest.
Outlook through Thursday, 23.11.2017
Wednesday
It will be sunny and, in the mountains, mild. The zero-degree level is expected to ascend to 3000 m. The hazards of dry-snow avalanches will decrease. Moist sluffs are possible in the northern and eastern regions more than anywhere else.
Thursday
To begin with it will be sunny and mild. During the course of the day, clouds will move in from the west. The avalanche danger levels are not expected to change significantly. As a result of intensifying southwesterly winds, fresh snowdrift accumulations can be expected to form from place to place.

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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