Moisture penetration into the snowpack is well advanced. The most precarious areas are slopes where weak layers in the old snowpack are becoming wet for the first time. At present, this mainly affects north-facing slopes between approximately 2200 and 2500 m, and east- and west-facing slopes between approximately 2500 and 2800 m. On south-facing slopes, moisture penetration into the snowpack extends as far as the high alpine regions. In Grisons, the weak layers in the old snowpack are the least deeply buried, which means that wet slab avalanches can also occasionally be triggered by human activity. In areas higher up, where the snowpack is still dry, weak layers in the old snowpack are still present, but are unlikely to be triggered anymore.

During the night into Tuesday, outgoing longwave radiation will be partially reduced in the inneralpine regions and strongly reduced on the northern flank of the Alps and the central part of the southern flank of the Alps. In addition, it will rain on the central part of the southern flank of the Alps during the night, increasing the danger of wet snow avalanches in this area in particular even in the morning.

After a mostly clear night, it was mostly sunny and mild during the day.

Fresh snow

-

Temperature

At midday at 2000 m, between +10 °C in the west and south and +7 °C in the east

Wind

Light

During the night into Tuesday, high cloud will increase and outgoing longwave radiation will be reduced. Showers are expected in central Ticino and in the Sotto Ceneri. In the morning, there will still be bright spells in Valais and the Engadine; otherwise, it will be variably cloudy with showers, especially in the afternoon. The snowfall level will drop from 2800 m to 2400 m in the south. In the north, it will be around 2300 m.

Fresh snow

A few centimetres in the high alpine regions

Temperature

At midday at 2000 m, around +7 °C

Wind

Mostly light from southwesterly directions

Wednesday

During the night into Wednesday, bright spells are possible in Valais and on the southern flank of the Alps; otherwise, it will be very cloudy. During the day, it will be variably cloudy with bright spells, especially in the Prealps and in Valais. Showers are still to be expected with a snowfall level of around 2400 m. In the high alpine regions, 5 to 10 cm of snow is expected to fall. There will be a moderate to strong Bise wind in the Prealps; at high altitudes, the wind will be mostly light. In the high alpine regions, the danger of dry avalanches may increase somewhat. Where there is reduced outgoing longwave radiation during the night and with rain, the danger of wet avalanches will increase even in the early morning.

Thursday

The night into Thursday will be mostly clear in the north, and mostly sunny during the day. On the southern flank of the Alps, the night will be mostly cloudy, turning increasingly sunny during the course of the day. The zero-degree level will be around 3000 m again. In the north, the avalanche situation will be generally favourable in the early morning. The danger of wet snow avalanches will increase as the day progresses. On the southern flank of the Alps, due to the cloud cover during the night, daytime changes in the danger of wet snow avalanches will be less pronounced and the danger will increase even in the early morning.