Wind slab
- Above 2,600 m
Snowpack
Fresh snow and wind are forming medium-sized snowdrift accumulations in the west and north, and generally smaller ones elsewhere. Below this, the top section of the old snowpack contains coarse-grained weak layers, primarily on north- and east-facing slopes at high altitudes.
Weather forecast until Ascension Day
The night will be rather cloudy. On Ascension Day it will be quite sunny along the Main Alpine Ridge in Upper Valais and in the Gotthard region, while elsewhere it will be very cloudy. Precipitation will be encountered over a wide area. The snowfall level will be between 1300 m in the north and 1800 m in the south.
Fresh snow
Until Ascension Day afternoon, the following amounts will fall above 2000 m:
Temperature
At midday at 2000 m, between -3 °C in the north and +1 °C in the south
Wind
Southwesterly to westerly
Weather review for Wednesday
There were cloudy spells overnight in the west and south, while skies were quite clear in the east. It was rather sunny during the day.
Fresh snow
-
Temperature
At midday at 2000 m, between -1 °C in the north and +3 °C in the south
Wind
Light to moderate from westerly directions
OutlookFriday
It will be very cloudy, with around 10 cm of snow falling over a wide area, less in Upper Valais and Ticino. The snowfall level will be around 1300 m. The wind will be mostly light.
The avalanche danger will not change significantly.
Saturday
In the north it will be very cloudy with 10 to 20 cm of snowfall over a wide area. The snowfall level will remain at around 1300 m. Along the Main Alpine Ridge and to the south of it, it will be mostly sunny with a strengthening northerly wind.
There will be a widespread increase in avalanche risk. In Upper Valais and Ticino, it will not change significantly.
Bulletin data: WSL Institute for Snow and Avalanche Research SLF (CC BY 4.0)