Zervreila

On wind-protected shady slopes, the weekend’s fresh snow is lying on surface hoar in some places. Loose fresh snow is additionally being transported by strong winds from variable directions resulting in the formation of snowdrift accumulations that are prone to triggering. Further small-scale snowdrift accumulations will form in Wednesday's strong southerly winds.

In the inneralpine regions of Valais and Grisons, the layers of fresh and drifted snow are also lying on a weak old snowpack with pronounced near-ground weak layers. Avalanches can sometimes propagate into these deep weak layers or be triggered there directly in isolated cases. In other regions, weak layers in old near-ground snowpack still remain in places on shady slopes but are now mainly so thickly covered that they are largely insensitive to triggering.

Overnight to Tuesday, there was broken cloud in the east with a little snow falling above 1200 m. Elsewhere the night was mainly clear. During the day, conditions were mainly sunny while the east became increasingly sunny once any remaining cloud had broken up.

Fresh snow

Central and eastern parts of the northern flank of the Alps, northern Grisons: 2 to 5 cm

Temperature

At midday at 2000 m, around +1 °C in the west and south and -4 °C in the east.

Wind

• At high altitudes, moderate to strong, mostly moderate from northerly directions during the day
• Moderate to strong northerly foehn wind in the Alpine valleys of the south overnight to Tuesday
• Moderate to strong bise wind in the Jura

Skies will mainly be clear overnight to Wednesday with broken cloud over central and southern Ticino. Conditions will mainly be sunny during the day and increasingly sunny as the day progresses in the far south.

Fresh snow

-

Temperature

At midday at 2000 m, around 0 °C in the north and -2 °C in the south

Wind

• Mainly moderate northerly to northeasterly overnight to Wednesday
• Moderate to strong easterly to southeasterly during the day
• Moderate southerly foehn wind during the day in the upper foehn valleys of the north.
• Strong bise wind in the Jura

After clear nights in the mountains, conditions will mainly be sunny on Thursday and Friday with broken cloud cover developing on Friday especially in the south. There will be a light to moderate northeasterly to easterly wind. The zero-degree level will be about 2000 m around midday on both days.

The danger of dry avalanches will decrease, but only slowly on shady slopes. With solar radiation and daytime warming, the danger of wet avalanches will increase somewhat on steep sunny slopes over the course of each day. Isolated gliding avalanches will be possible.