obere Leventina

In the regions north of a line from the Rhône to the Rhine and in the extreme west of Lower Valais, weak layers in the snowpack are mostly thickly covered and are now hardly triggerable by human activity.

In the regions south of a line from the Rhône to the Rhine, the persistent weak layers that have been a feature since the beginning of January are still present. However, the number of avalanche-prone locations is continuing to decrease. Isolated danger signs have still been observed in the last few days, particularly in Grisons and eastern Ticino, and dry avalanches have been triggered in deeper layers of the snowpack, including large ones.

Weak layers in the lower part of the snowpack are being weakened as they become moistened for the first time. Wet slab avalanches are possible as the day progresses. These can occur naturally but can also be occasionally triggered by winter sports participants, at present mainly on sunny slopes below approximately 2600 m. Isolated gliding avalanches are also possible here. Gliding avalanches can become large, especially in the snowier west.

After a clear night, it was mostly sunny. Visibility was still somewhat obscured by Sahara dust. Cumulus clouds formed in the Jura, the Prealps and in the south.

Fresh snow

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Temperature

At midday at 2000 m, between +3 °C in the north and +1 °C in the south

Wind

Mainly light from the south to southeast

The night will only be partly clear in the south and south-east but mostly clear elsewhere. During the day it will be quite sunny in the mountains, with patches of cloud, especially in the east. In the Jura and the Prealps, there will be an increase in cumulus clouds and isolated rain showers will be possible. The obscuring of visibility due to Sahara dust will decrease. In the south, cloud cover will increase as the day progresses and light showers will be possible in some localities. The snowfall level will be between 1400 m and 1600 m.

Fresh snow

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Temperature

At midday at 2000 m, around +2 °C in the north and -1 °C in the south

Wind

Mostly weak from south to southwest, picking up somewhat as the day progresses

The nights will be mostly clear in the east, but only partially clear in the west and south. During the day on both days, it will be partly sunny with variable cloud cover in the north and often cloudy in the south. Weak showers are possible, especially in the Jura and in the south, then on Wednesday also on the western part of the northern flank of the Alps and in the Prealps. The snowfall level will be between 1400 and 1700 m. The southwesterly wind will be mostly weak at first, but will pick up as the day progresses on Wednesday.

The danger of dry avalanches will not change significantly. The danger of wet and gliding avalanches will increase somewhat as each day progresses. Touring and off-piste descents should be completed in good time.