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Avalanche bulletin through Monday, 20 May 2019

Significant increase in avalanche danger as a result of snowfall and rainfall

Edition: Su. 19.05., 17:00 Next update: Mo. 20.05., 18:00 Validity

Avalanche bulletin through Monday, 20 May 2019

Significant increase in avalanche danger as a result of snowfall and rainfall

Edition Su. 19.05., 17:00 Next update Mo. 20.05., 18:00 Validity

Avalanche bulletin through Monday, 20 May 2019

Significant increase in avalanche danger as a result of snowfall and rainfall

Edition Su. 19.05., 17:00 Next update Mo. 20.05., 18:00 Validity

Avalanche bulletin through Monday, 20 May 2019

Significant increase in avalanche danger as a result of snowfall and rainfall

Edition Su. 19.05., 17:00 Next update Mo. 20.05., 18:00 Validity

 
Significant increase in avalanche danger as a result of snowfall and rainfall
Edition: 19.5.2019, 17:00 / Next update: 20.5.2019, 18:00
Avalanche danger
Bernese Prealps, central and eastern sectors of the northern flank of the Alps: considerable avalanche danger (level 3) above approximately 2400 m for dry-snow avalanches, and for wet-snow avalanches below that altitude. Avalanche prone locations are found in all aspects. At high altitudes, the fresh snow is prone to triggering, below approximately 2200 m the snowpack is being weakened by rainfall. Naturally triggered avalanches can be expected. These can sweep away the deep, thoroughly wet snowpack below approximately 2500 m and grow to very large size in isolated cases. For tours in outlying terrain away from marked and secured ski runs, conditions are unfavourable.
Remaining parts of the western sector of the northern flank of the Alps, Valais, Grisons, north of Anterior Rhine: above approximately 2500 m, the major danger stems from fresh snow and freshly generated snowdrift accumulations. During the afternoon, danger level 2 (considerable) will be reached. On west-to-north-to east facing slopes below approximately 2500 m more than anywhere else, wet-snow avalanches can be expected. These releases can grow to large size. Backcountry tours require experience in the evaluation of avalanche dangers on-site.
Remaining regions of Grisons, Ticino: above approximately 2500 m, the major danger stems from freshly generated and also from older snowdrift accumulations. These snowdrifts need to be evaluated with great caution on-site in steep terrain. On west-facing to north-facing to east-facing slopes more than anywhere else, isolated wet-snow avalanches can be expected in isolated cases below approximately 2500 m. These releases can grow to large size.
Snow and weather
Snowcover
There is significantly more snow in the heights than is customary for this juncture of the season.
The fresh snow was deposited on top of an old snowpack which became moist for the first time during the last few days on north-facing slopes at approximately 2500 m, and thus, has been weakened. On south-facing slopes, the intermediate and deeper-down layers of the snow cover have been thoroughy wet already for a longer period of time, and thereby have become more stable in the meantime. Below approximately 2200 m, the snow cover in the northern regions is becoming thoroughly wet as a consequence of intensive rainfall.
Weather review to Sunday, 19 May
Skies were heavily overcast, accompanied by isolated bright intervals which in Upper Valais were more extensive in the early morning hours. With the snowfall level at approximately 2200 m, there was a small amount of precipitation from place to place. In the Upper Valais sector of the Main Alpine Ridge, in Bedretto and in the valleys of Maggia, there was 10 to 15 cm of fresh snow registered. Thus, during the course of the last three days above approximately 2500 m, there has been a total of 20 to 50 cm of fresh snow registered. Midday temperatures at 2000 m lay at +3 °C; the winds were blowing at light strength.
Weather outlook through Monday, 20 May
Skies will be heavily overcast, accompanied by showers and thunderstorms. In the southern regions, only a small amount of precipitation is anticipated, accompanied by brief bright intervals. The snowfall level will lie at approximately 2200 m. Between Sunday afternoon and Monday afternoon, the following amounts of fresh snow are anticipated, while the amounts and distribution of precipitation are still uncertain:
  • regions north of an imaginary Rhine-Rhone line, Lower Valais: 20 to 40 cm; along the central and eastern sectors of the Prealps, 40 to 70 cm;
  • in the other regions of Switzerland, 10 to 20 cm over widespread areas.
During the nighttime hours, winds will shift from easterly to northwesterly. To begin with, light winds will predominate, subsequently, winds will be blowing at moderate to strong velocity during the daytime.
Outlook
Tuesday, 21 May
Skies will be heavily overcast, and there will be snowfall above approximately 2000 m, which in the northern regions will be heavy. The precise focal point of precipitation is still uncertain, most probably it will lie in the central to eastern sector of the northern flank of the Alps as far as Grisons. In the western regions, precipitation will slacken off during the course of the day, and bright intervals are expected. In the furthermost southern regions it will be partly sunny and it will remain dry.
Avalanche danger is expected to increase over widespread areas. In the major areas of precipitation the avalanche situation will become very critical both for dry-snow and for wet-snow avalanches. In the southern regions, the danger of dry-snow avalanches is expected to decrease, nevertheless wet-snow avalanches can be expected during the course of the day.
Wednesday, 22 May
On Wednesday in the northeastern regions, a small amount of snowfall is anticipated. In the other regions of Switzerland, it will be partly sunny, accompanied by showers from place to place in the afternoon.
The danger of dry-snow avalanches will remain critical in the eastern regions. In the western and the southern regions, avalanche danger will decrease. The danger of wet-snow avalanches is expected to increase significantly in all regions during the course of the day.

Keep informed about the publication of unannounced Avalanche Bulletins. Activate in the App WhiteRisk the "Push Summer Bulletin". You can also subscribe to the SMS Service by sending an SMS "START SLF SOMMER" to Nr. 9234 (only Swiss cell phone providers) or unsubscribe by sending an SMS "STOP SLF SOMMER" (CHF 0.2/SMS).
Significant increase in avalanche danger as a result of snowfall and rainfall
Edition: 19.5.2019, 17:00 / Next update: 20.5.2019, 18:00
Avalanche danger
Bernese Prealps, central and eastern sectors of the northern flank of the Alps: considerable avalanche danger (level 3) above approximately 2400 m for dry-snow avalanches, and for wet-snow avalanches below that altitude. Avalanche prone locations are found in all aspects. At high altitudes, the fresh snow is prone to triggering, below approximately 2200 m the snowpack is being weakened by rainfall. Naturally triggered avalanches can be expected. These can sweep away the deep, thoroughly wet snowpack below approximately 2500 m and grow to very large size in isolated cases. For tours in outlying terrain away from marked and secured ski runs, conditions are unfavourable.
Remaining parts of the western sector of the northern flank of the Alps, Valais, Grisons, north of Anterior Rhine: above approximately 2500 m, the major danger stems from fresh snow and freshly generated snowdrift accumulations. During the afternoon, danger level 2 (considerable) will be reached. On west-to-north-to east facing slopes below approximately 2500 m more than anywhere else, wet-snow avalanches can be expected. These releases can grow to large size. Backcountry tours require experience in the evaluation of avalanche dangers on-site.
Remaining regions of Grisons, Ticino: above approximately 2500 m, the major danger stems from freshly generated and also from older snowdrift accumulations. These snowdrifts need to be evaluated with great caution on-site in steep terrain. On west-facing to north-facing to east-facing slopes more than anywhere else, isolated wet-snow avalanches can be expected in isolated cases below approximately 2500 m. These releases can grow to large size.
Snow and weather
Snowcover
There is significantly more snow in the heights than is customary for this juncture of the season.
The fresh snow was deposited on top of an old snowpack which became moist for the first time during the last few days on north-facing slopes at approximately 2500 m, and thus, has been weakened. On south-facing slopes, the intermediate and deeper-down layers of the snow cover have been thoroughy wet already for a longer period of time, and thereby have become more stable in the meantime. Below approximately 2200 m, the snow cover in the northern regions is becoming thoroughly wet as a consequence of intensive rainfall.
Weather review to Sunday, 19 May
Skies were heavily overcast, accompanied by isolated bright intervals which in Upper Valais were more extensive in the early morning hours. With the snowfall level at approximately 2200 m, there was a small amount of precipitation from place to place. In the Upper Valais sector of the Main Alpine Ridge, in Bedretto and in the valleys of Maggia, there was 10 to 15 cm of fresh snow registered. Thus, during the course of the last three days above approximately 2500 m, there has been a total of 20 to 50 cm of fresh snow registered. Midday temperatures at 2000 m lay at +3 °C; the winds were blowing at light strength.
Weather outlook through Monday, 20 May
Skies will be heavily overcast, accompanied by showers and thunderstorms. In the southern regions, only a small amount of precipitation is anticipated, accompanied by brief bright intervals. The snowfall level will lie at approximately 2200 m. Between Sunday afternoon and Monday afternoon, the following amounts of fresh snow are anticipated, while the amounts and distribution of precipitation are still uncertain:
  • regions north of an imaginary Rhine-Rhone line, Lower Valais: 20 to 40 cm; along the central and eastern sectors of the Prealps, 40 to 70 cm;
  • in the other regions of Switzerland, 10 to 20 cm over widespread areas.
During the nighttime hours, winds will shift from easterly to northwesterly. To begin with, light winds will predominate, subsequently, winds will be blowing at moderate to strong velocity during the daytime.
Outlook
Tuesday, 21 May
Skies will be heavily overcast, and there will be snowfall above approximately 2000 m, which in the northern regions will be heavy. The precise focal point of precipitation is still uncertain, most probably it will lie in the central to eastern sector of the northern flank of the Alps as far as Grisons. In the western regions, precipitation will slacken off during the course of the day, and bright intervals are expected. In the furthermost southern regions it will be partly sunny and it will remain dry.
Avalanche danger is expected to increase over widespread areas. In the major areas of precipitation the avalanche situation will become very critical both for dry-snow and for wet-snow avalanches. In the southern regions, the danger of dry-snow avalanches is expected to decrease, nevertheless wet-snow avalanches can be expected during the course of the day.
Wednesday, 22 May
On Wednesday in the northeastern regions, a small amount of snowfall is anticipated. In the other regions of Switzerland, it will be partly sunny, accompanied by showers from place to place in the afternoon.
The danger of dry-snow avalanches will remain critical in the eastern regions. In the western and the southern regions, avalanche danger will decrease. The danger of wet-snow avalanches is expected to increase significantly in all regions during the course of the day.

Keep informed about the publication of unannounced Avalanche Bulletins. Activate in the App WhiteRisk the "Push Summer Bulletin". You can also subscribe to the SMS Service by sending an SMS "START SLF SOMMER" to Nr. 9234 (only Swiss cell phone providers) or unsubscribe by sending an SMS "STOP SLF SOMMER" (CHF 0.2/SMS).
 

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:

Significant increase in avalanche danger as a result of snowfall and rainfall
Edition: 19.5.2019, 17:00 / Next update: 20.5.2019, 18:00
Avalanche danger
Bernese Prealps, central and eastern sectors of the northern flank of the Alps: considerable avalanche danger (level 3) above approximately 2400 m for dry-snow avalanches, and for wet-snow avalanches below that altitude. Avalanche prone locations are found in all aspects. At high altitudes, the fresh snow is prone to triggering, below approximately 2200 m the snowpack is being weakened by rainfall. Naturally triggered avalanches can be expected. These can sweep away the deep, thoroughly wet snowpack below approximately 2500 m and grow to very large size in isolated cases. For tours in outlying terrain away from marked and secured ski runs, conditions are unfavourable.
Remaining parts of the western sector of the northern flank of the Alps, Valais, Grisons, north of Anterior Rhine: above approximately 2500 m, the major danger stems from fresh snow and freshly generated snowdrift accumulations. During the afternoon, danger level 2 (considerable) will be reached. On west-to-north-to east facing slopes below approximately 2500 m more than anywhere else, wet-snow avalanches can be expected. These releases can grow to large size. Backcountry tours require experience in the evaluation of avalanche dangers on-site.
Remaining regions of Grisons, Ticino: above approximately 2500 m, the major danger stems from freshly generated and also from older snowdrift accumulations. These snowdrifts need to be evaluated with great caution on-site in steep terrain. On west-facing to north-facing to east-facing slopes more than anywhere else, isolated wet-snow avalanches can be expected in isolated cases below approximately 2500 m. These releases can grow to large size.
Snow and weather
Snowcover
There is significantly more snow in the heights than is customary for this juncture of the season.
The fresh snow was deposited on top of an old snowpack which became moist for the first time during the last few days on north-facing slopes at approximately 2500 m, and thus, has been weakened. On south-facing slopes, the intermediate and deeper-down layers of the snow cover have been thoroughy wet already for a longer period of time, and thereby have become more stable in the meantime. Below approximately 2200 m, the snow cover in the northern regions is becoming thoroughly wet as a consequence of intensive rainfall.
Weather review to Sunday, 19 May
Skies were heavily overcast, accompanied by isolated bright intervals which in Upper Valais were more extensive in the early morning hours. With the snowfall level at approximately 2200 m, there was a small amount of precipitation from place to place. In the Upper Valais sector of the Main Alpine Ridge, in Bedretto and in the valleys of Maggia, there was 10 to 15 cm of fresh snow registered. Thus, during the course of the last three days above approximately 2500 m, there has been a total of 20 to 50 cm of fresh snow registered. Midday temperatures at 2000 m lay at +3 °C; the winds were blowing at light strength.
Weather outlook through Monday, 20 May
Skies will be heavily overcast, accompanied by showers and thunderstorms. In the southern regions, only a small amount of precipitation is anticipated, accompanied by brief bright intervals. The snowfall level will lie at approximately 2200 m. Between Sunday afternoon and Monday afternoon, the following amounts of fresh snow are anticipated, while the amounts and distribution of precipitation are still uncertain:
  • regions north of an imaginary Rhine-Rhone line, Lower Valais: 20 to 40 cm; along the central and eastern sectors of the Prealps, 40 to 70 cm;
  • in the other regions of Switzerland, 10 to 20 cm over widespread areas.
During the nighttime hours, winds will shift from easterly to northwesterly. To begin with, light winds will predominate, subsequently, winds will be blowing at moderate to strong velocity during the daytime.
Outlook
Tuesday, 21 May
Skies will be heavily overcast, and there will be snowfall above approximately 2000 m, which in the northern regions will be heavy. The precise focal point of precipitation is still uncertain, most probably it will lie in the central to eastern sector of the northern flank of the Alps as far as Grisons. In the western regions, precipitation will slacken off during the course of the day, and bright intervals are expected. In the furthermost southern regions it will be partly sunny and it will remain dry.
Avalanche danger is expected to increase over widespread areas. In the major areas of precipitation the avalanche situation will become very critical both for dry-snow and for wet-snow avalanches. In the southern regions, the danger of dry-snow avalanches is expected to decrease, nevertheless wet-snow avalanches can be expected during the course of the day.
Wednesday, 22 May
On Wednesday in the northeastern regions, a small amount of snowfall is anticipated. In the other regions of Switzerland, it will be partly sunny, accompanied by showers from place to place in the afternoon.
The danger of dry-snow avalanches will remain critical in the eastern regions. In the western and the southern regions, avalanche danger will decrease. The danger of wet-snow avalanches is expected to increase significantly in all regions during the course of the day.

Keep informed about the publication of unannounced Avalanche Bulletins. Activate in the App WhiteRisk the "Push Summer Bulletin". You can also subscribe to the SMS Service by sending an SMS "START SLF SOMMER" to Nr. 9234 (only Swiss cell phone providers) or unsubscribe by sending an SMS "STOP SLF SOMMER" (CHF 0.2/SMS).

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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