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Avalanche bulletin through Monday, 22 April 2019

In the early morning a favourable avalanche situation will prevail. Wet avalanches as the day progresses

Edition: Su. 21.04., 17:00 Next update: Mo. 22.04., 17:00 Validity

Avalanche bulletin through Monday, 22 April 2019

In the early morning a favourable avalanche situation will prevail. Wet avalanches as the day progresses

Edition Su. 21.04., 17:00 Next update Mo. 22.04., 18:00 Validity

Avalanche bulletin through Monday, 22 April 2019

In the early morning a favourable avalanche situation will prevail. Wet avalanches as the day progresses

Edition Su. 21.04., 17:00 Next update Mo. 22.04., 17:00 Validity

Avalanche bulletin through Monday, 22 April 2019

In the early morning a favourable avalanche situation will prevail. Wet avalanches as the day progresses

Edition Su. 21.04., 17:00 Next update Mo. 22.04., 17:00 Validity

 
Level 1, low

Dry avalanches:

Individual avalanche prone locations for dry avalanches are to be found especially on extremely steep north facing slopes above approximately 2400 m. As a consequence of a strengthening southerly wind, mostly small wind slabs will form in particular above approximately 2600 m. 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.

Wet avalanches as day progresses

Danger map Wet

see also snowpack and weather

Level 2, moderate

Wet avalanches as day progresses

As a consequence of warming during the day, the likelihood of wet and gliding avalanches being released will increase. Medium-sized and, in isolated cases, large avalanches are possible. This applies on very steep south facing slopes below approximately 3400 m as well as on north facing slopes below approximately 2600 m. On very steep east and west facing slopes the avalanche prone locations are to be found below approximately 3000 m.
Backcountry tours and off-piste skiing should be concluded timely.

Dry avalanches

Danger map Dry

see also snowpack and weather

In the early morning a favourable avalanche situation will prevail. Wet avalanches as the day progresses
Edition: 21.4.2019, 17:00 / Next update: 22.4.2019, 18:00
Snowpack
The snow cover is favourably structured for the most part and, during the morning hours, stable.
The snowpack is becoming thoroughly wet to an ever greater degree. North-facing slopes are thoroughly wet up to approximately 2400 m, south-facing slopes up as high as high alpine regions, east-facing and west-facing slopes up to approximately 2800 m. What is currently most critical are the altitude bands and aspects which have become moist for the first time, that is, north-facing slopes between 2200 and 2600 m, and east and west-facing slopes between 2600 and 3000 m. In those regions, increasingly frequent area-wide, moist slab avalanches have been registered. During the nightttime hours, a crust forms on the snowpack surface. As a consequence of the reduced nocturnal outgoing (longwave) radiation, the crust at intermediate altitudes is hardly capable of bearing loads. The melt-freeze crust then softens and melts during the course of the day and the danger of wet-snow avalanches increases. However, due to dense cloud cover, it no longer melts to the same degree as in the last few days. On north-facing slopes on the northern flank of the Alps and in northern Grisons above 1000 m to 1400 m, in the other regions of Switzerland above 1400 m to 1800 m, there is a cohesive, area-wide snowpack. On south-facing slopes the snow levels lie approximately 400 m higher up.
Observed weather on Sunday, 21.04.2019
During the night, high-altitude cloud cover moved in from the south, which tended to reduce the outgoing radiation somewhat. During the daytime, it was only partly sunny as a consequence of the intermittently heavy cloud cover in western regions more than anywhere else.
Fresh snow
-
Temperature
At midday at 2000 m, betweeen +8 °C in the western regions and +6 °C in the eastern regions.
Wind
Winds were southeasterly,
  • on the northern Alpine Ridge blowing at moderate to strong velocity,
  • in the other regions of Switzerland, blowing at light to moderate strength.
Weather forecast through Monday, 22.04.2019
Nighttime skies in the Valais will be predominantly overcast, in the other regions variably cloudy. During the daytime it will be partly sunny accompanied by heavy cloud cover in some regions and intermediate altitude clouds. The clouds will tend to become heavier in the afternoon in the western and the southern regions more than anywhere else. Nevertheless, it is expected to remain predominantly dry until evening.
Fresh snow
-
Temperature
At midday at 2000 m, between +8 °C in the northern regions and +5 °C in the southern regions.
Wind
Winds will be southerly,
  • blowing predominantly at moderate strength,
  • blowing at strong velocity on the northern Alpine Ridge, extending down to low lying areas in the foehn-exposed Alpine valleys.
Outlook through Wednesday, 24.04.2019
On the Main Alpine Ridge and southwards therefrom, skies will be heavily overcast and repeated bouts of precipitation are anticipated. The snowfall level will lie at approximately 2000 m. The southerly winds will be blowing at strong velocity, on Wednesday even reaching storm strength. In the northern regions, foehn wind will extend down to low lying areas.
By Wednesday evening in the Upper Valais section of the Main Alpine Ridge and on the southern flank of the Alps above approximately 2500 m, 40 to 60 cm of fresh snow is anticipated; in the Monte Rosa region even more. The danger of dry-snow avalanches will increase significantly at high altitudes in those regions. In the northern regions, a small amount of fresh snow is possible in high alpine regions more than anywhere else. The danger of wet-snow avalanches is not expected to change significantly.
 

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:

In the early morning a favourable avalanche situation will prevail. Wet avalanches as the day progresses
Edition: 21.4.2019, 17:00 / Next update: 22.4.2019, 18:00
Snowpack
The snow cover is favourably structured for the most part and, during the morning hours, stable.
The snowpack is becoming thoroughly wet to an ever greater degree. North-facing slopes are thoroughly wet up to approximately 2400 m, south-facing slopes up as high as high alpine regions, east-facing and west-facing slopes up to approximately 2800 m. What is currently most critical are the altitude bands and aspects which have become moist for the first time, that is, north-facing slopes between 2200 and 2600 m, and east and west-facing slopes between 2600 and 3000 m. In those regions, increasingly frequent area-wide, moist slab avalanches have been registered. During the nightttime hours, a crust forms on the snowpack surface. As a consequence of the reduced nocturnal outgoing (longwave) radiation, the crust at intermediate altitudes is hardly capable of bearing loads. The melt-freeze crust then softens and melts during the course of the day and the danger of wet-snow avalanches increases. However, due to dense cloud cover, it no longer melts to the same degree as in the last few days. On north-facing slopes on the northern flank of the Alps and in northern Grisons above 1000 m to 1400 m, in the other regions of Switzerland above 1400 m to 1800 m, there is a cohesive, area-wide snowpack. On south-facing slopes the snow levels lie approximately 400 m higher up.
Observed weather on Sunday, 21.04.2019
During the night, high-altitude cloud cover moved in from the south, which tended to reduce the outgoing radiation somewhat. During the daytime, it was only partly sunny as a consequence of the intermittently heavy cloud cover in western regions more than anywhere else.
Fresh snow
-
Temperature
At midday at 2000 m, betweeen +8 °C in the western regions and +6 °C in the eastern regions.
Wind
Winds were southeasterly,
  • on the northern Alpine Ridge blowing at moderate to strong velocity,
  • in the other regions of Switzerland, blowing at light to moderate strength.
Weather forecast through Monday, 22.04.2019
Nighttime skies in the Valais will be predominantly overcast, in the other regions variably cloudy. During the daytime it will be partly sunny accompanied by heavy cloud cover in some regions and intermediate altitude clouds. The clouds will tend to become heavier in the afternoon in the western and the southern regions more than anywhere else. Nevertheless, it is expected to remain predominantly dry until evening.
Fresh snow
-
Temperature
At midday at 2000 m, between +8 °C in the northern regions and +5 °C in the southern regions.
Wind
Winds will be southerly,
  • blowing predominantly at moderate strength,
  • blowing at strong velocity on the northern Alpine Ridge, extending down to low lying areas in the foehn-exposed Alpine valleys.
Outlook through Wednesday, 24.04.2019
On the Main Alpine Ridge and southwards therefrom, skies will be heavily overcast and repeated bouts of precipitation are anticipated. The snowfall level will lie at approximately 2000 m. The southerly winds will be blowing at strong velocity, on Wednesday even reaching storm strength. In the northern regions, foehn wind will extend down to low lying areas.
By Wednesday evening in the Upper Valais section of the Main Alpine Ridge and on the southern flank of the Alps above approximately 2500 m, 40 to 60 cm of fresh snow is anticipated; in the Monte Rosa region even more. The danger of dry-snow avalanches will increase significantly at high altitudes in those regions. In the northern regions, a small amount of fresh snow is possible in high alpine regions more than anywhere else. The danger of wet-snow avalanches is not expected to change significantly.

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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