Zervreila

With the sometimes strong Bise wind on Wednesday, some rather small but in some cases prone to triggering snowdrift accumulations will form, particularly along the Prealps and in the Jura. Otherwise, the large amounts of new snow and drifted snow in the north will slowly stabilise. In some places, however, the new snow of recent days is overlaid on faceted weak layers and in some cases also buried surface hoar, particularly on shady slopes. In these weak layers, avalanches can be triggered, including large ones.

In the inneralpine regions of Valais and especially Grisons, weak layers deeper in the snowpack are still prone to triggering in some places. Isolated avalanches may also be triggered in near-ground weak layers.

Overnight to Tuesday, there was widespread snow down to low altitudes, with heavy snowfall in the north. During the day, the snowfall decreased appreciably. There were bright spells, particularly in southern Valais and Ticino.

Fresh snow

From Monday morning to Tuesday afternoon above approximately 1600 m:

• Northern Alpine Ridge from the Wildstrubel to the St. Galler Oberland: 50 to 70 cm
• Northern Alpine Ridge from the Rohneknie to the Wildstrubel, remaining central and eastern parts of the northern flank of the Alps, southern Goms, southern Tavetsch: 30 to 50 cm
• Remaining northern flank of the Alps and from southern Valais across northern Ticino to northern and central Grisons: 15 to 30 cm
• Less elsewhere, no snow in the south.

Temperature

At midday at 2000 m, between -9 °C in the north and -4 °C in the south

Wind

Strong from the north

In the north, a few more centimetres of snow will fall during the night down to low altitudes. There will be bright spells during the day. In the west and south, it will be mostly sunny after a clear night.

Fresh snow

A few centimetres in the north.

Temperature

At midday at 2000 m, around -8 °C in the north and -3 °C in the south

Wind

• Remaining moderate to strong from the northeast during the night
• Light to moderate easterly wind during the day in the mountains; moderate to strong Bise wind along the Prealps and in the Jura

In the west and south, it will be mostly sunny on both days. It will be partly cloudy along the Prealps and generally in the east. On Friday, light showers are possible in the east. In the mountains there will be a partly moderate northeasterly wind, with a moderate Bise wind in the Jura. The zero-degree level will rise to around 1600 m in the north and to 2200 m in the south.

The danger of dry avalanches will decrease. During the course of the day, moist loose snow avalanches from the loose snow and also gliding avalanches are to be expected.