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Avalanche bulletin through Thursday, 19 April 2018

In the early morning a generally favourable avalanche situation will prevail. Full-depth and wet avalanches as the day progresses

Edition: We. 18.04., 17:00 Next update: Th. 19.04., 17:00 Validity

Avalanche bulletin through Thursday, 19 April 2018

In the early morning a generally favourable avalanche situation will prevail. Full-depth and wet avalanches as the day progresses

Edition We. 18.04., 17:00 Next update Th. 19.04., 18:00 Validity

Avalanche bulletin through Thursday, 19 April 2018

In the early morning a generally favourable avalanche situation will prevail. Full-depth and wet avalanches as the day progresses

Edition We. 18.04., 17:00 Next update Th. 19.04., 17:00 Validity

Avalanche bulletin through Thursday, 19 April 2018

In the early morning a generally favourable avalanche situation will prevail. Full-depth and wet avalanches as the day progresses

Edition We. 18.04., 17:00 Next update Th. 19.04., 17:00 Validity

 
Level 2, moderate

Dry avalanches: Old snow

Avalanche prone locations
In particular in northwest to north to northeast facing aspects above approximately 2600m.

In particular in northwest to north to northeast facing aspects above approximately 2600m.

Danger description

In high Alpine regions small snow drift accumulations have formed. Older snow drift accumulations can be released, especially by large additional loads,. Additionally in isolated cases avalanches can release deeper layers of the snowpack and reach dangerously large size. These avalanche prone locations are to be found in particular on little-used, rather lightly snow-covered north facing slopes. They are rare but barely recognisable, even to the trained eye. Careful route selection is recommended.

Wet avalanches as day progresses

Danger map Wet

see also snowpack and weather

Level 1, low

Dry avalanches:

Individual avalanche prone locations for dry avalanches are to be found in particular in extremely steep terrain and adjacent to the ridge line. 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

Dry avalanches:

Avalanche prone locations
In particular in northwest to north to northeast facing aspects above approximately 3000m.

In particular in northwest to north to northeast facing aspects above approximately 3000m.

Danger description

In high Alpine regions small snow drift accumulations have formed. Older snow drift accumulations can be released in isolated cases, but mostly only by large additional loads,. Careful route selection is advisable.

Wet avalanches as day progresses

Danger map Wet

see also snowpack and weather

Level 1, low

Dry avalanches:

Hardly any more dry avalanches are possible.

Wet avalanches as day progresses

Danger map Wet

see also snowpack and weather

Level 2, moderate

Wet avalanches as day progresses

In the late morning as a consequence of warming during the day and solar radiation there will be a rapid increase in the danger of wet and full-depth avalanches. From origins in starting zones where no previous releases have taken place full-depth and wet avalanches are to be expected, including quite large ones. The avalanche prone locations are to be found in all aspects. Backcountry tours should be started very early and concluded timely. Caution is to be exercised in areas with glide cracks.

Dry avalanches

Danger map Dry

see also snowpack and weather

Level 1, low

Wet avalanches as day progresses

Individual full-depth and wet avalanches are possible, but they will be mostly small. Restraint should be exercised because avalanches can sweep people along and give rise to falls.

Dry avalanches

Danger map Dry

see also snowpack and weather

Level 3, considerable

Wet avalanches as day progresses

In the late morning as a consequence of warming during the day and solar radiation there will be a rapid increase in the danger of wet and full-depth avalanches. A large number of full-depth and wet avalanches are to be expected. The avalanche prone locations are to be found in particular in east to south to west facing aspects below approximately 3000 m and on north facing slopes below approximately 2400 m. Large avalanches are possible in particular in starting zones where no previous releases have taken place. In avalanche paths that are already filled with snow in particular these can in some cases reach intermediate altitudes. Exposed parts of transportation routes can be endangered. Backcountry tours, off-piste skiing and ascents to alpine cabins should be started very early and concluded timely. Areas with glide cracks are to be avoided as far as possible.

Dry avalanches

Danger map Dry

see also snowpack and weather

In the early morning a generally favourable avalanche situation will prevail. Full-depth and wet avalanches as the day progresses
Edition: 18.4.2018, 17:00 / Next update: 19.4.2018, 18:00
Snowpack
The snow cover on steep south-facing slopes is thoroughly wet up as far as high alpine regions. North-facing slopes between 2200 and 2500 m are becoming moist/wet to an increasing degree, thereby weakening the snowpack further in these places. As a consequence of nocturnal outgoing radiation, a melt-freeze crust which is capable of bearing loads tends to form at high altitudes. Below approximately 2000 m, the snowpack surface cannot freeze any longer due to the heightened nighttime temperatures. As a result of solar radiation and daytime warming, the snowpack subsequently forfeits its stability rapidly during the morning hours. Wet-snow and gliding-snow avalanches can be expected, increasingly frequently on north-facing slopes as well. Due to the extraordinarly snow depths over widespread areas, these avalanches can grow to large size in isolated cases.
Avalanche prone locations for dry-snow avalanches are found on high altitude north-facing slopes more than anywhere else. Particularly south of an imaginary Rhine-Rhone line, the uppermost layers of the snow cover can still be triggered in some cases. In Ticino and in Grisons, more than anywhere else, dry-snow avalanches can in isolated cases even sweep away more deeply embedded layers of the snowpack.
Observed weather on Wednesday, 18.04.2018
Following a night of clear skies, it was sunny and quite mild.
Fresh snow
-
Temperature
At midday at 2000 m, +10 °C in western regions and +8 °C in eastern and southern regions.
Wind
Winds at high altitudes were easterly, blowing intermittently at moderate strength; in the other regions winds were predominantly light.
Weather forecast through Thursday, 19.04.2018
Following a night of clear skies, it will be predominantly sunny and quite mild.
Fresh snow
-
Temperature
At midday at 2000 m, +10 °C in northern regions and + 8 °C in southern regions. The zero-degree level will be at 3600 m.
Wind
Winds will be easterly, blowing predominantly at light strength, at moderate velocity at 4000 m.
Outlook through Saturday, 21.04.2018
Following nights of predominantly clear skies, it will be sunny and quite mild on both days. The zero-degree level will be at 3500 m. On Saturday afternoon, increasing convective cloud build-up is anticipated. Local showers are possible. In the early morning hours the avalanche situation is favourable on each day. However, the snowpack below 2000 m is hardly able to freeze during the nights, since the temperatures are now too high. During the course of each day, the danger of wet-snow and gliding-snow avalanches increases significantly. Gliding-snow avalanches are even possible during the night in isolated cases. Backcountry skiing and freeriding tours, as well as ascents to mountain refuges and descents to the valley, should all be brought to a close early in the day.
 

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 generally favourable avalanche situation will prevail. Full-depth and wet avalanches as the day progresses
Edition: 18.4.2018, 17:00 / Next update: 19.4.2018, 18:00
Snowpack
The snow cover on steep south-facing slopes is thoroughly wet up as far as high alpine regions. North-facing slopes between 2200 and 2500 m are becoming moist/wet to an increasing degree, thereby weakening the snowpack further in these places. As a consequence of nocturnal outgoing radiation, a melt-freeze crust which is capable of bearing loads tends to form at high altitudes. Below approximately 2000 m, the snowpack surface cannot freeze any longer due to the heightened nighttime temperatures. As a result of solar radiation and daytime warming, the snowpack subsequently forfeits its stability rapidly during the morning hours. Wet-snow and gliding-snow avalanches can be expected, increasingly frequently on north-facing slopes as well. Due to the extraordinarly snow depths over widespread areas, these avalanches can grow to large size in isolated cases.
Avalanche prone locations for dry-snow avalanches are found on high altitude north-facing slopes more than anywhere else. Particularly south of an imaginary Rhine-Rhone line, the uppermost layers of the snow cover can still be triggered in some cases. In Ticino and in Grisons, more than anywhere else, dry-snow avalanches can in isolated cases even sweep away more deeply embedded layers of the snowpack.
Observed weather on Wednesday, 18.04.2018
Following a night of clear skies, it was sunny and quite mild.
Fresh snow
-
Temperature
At midday at 2000 m, +10 °C in western regions and +8 °C in eastern and southern regions.
Wind
Winds at high altitudes were easterly, blowing intermittently at moderate strength; in the other regions winds were predominantly light.
Weather forecast through Thursday, 19.04.2018
Following a night of clear skies, it will be predominantly sunny and quite mild.
Fresh snow
-
Temperature
At midday at 2000 m, +10 °C in northern regions and + 8 °C in southern regions. The zero-degree level will be at 3600 m.
Wind
Winds will be easterly, blowing predominantly at light strength, at moderate velocity at 4000 m.
Outlook through Saturday, 21.04.2018
Following nights of predominantly clear skies, it will be sunny and quite mild on both days. The zero-degree level will be at 3500 m. On Saturday afternoon, increasing convective cloud build-up is anticipated. Local showers are possible. In the early morning hours the avalanche situation is favourable on each day. However, the snowpack below 2000 m is hardly able to freeze during the nights, since the temperatures are now too high. During the course of each day, the danger of wet-snow and gliding-snow avalanches increases significantly. Gliding-snow avalanches are even possible during the night in isolated cases. Backcountry skiing and freeriding tours, as well as ascents to mountain refuges and descents to the valley, should all be brought to a close early in the day.

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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