Zervreila

Especially on wind-protected shady slopes, fresh and drifted snow from the last period of precipitation is lying on an old snow surface which is faceted in many places, or on surface hoar. The bonding to the old snow surface is therefore poor in many places. Deeper layers of the snowpack are relatively well consolidated in the extreme west of Lower Valais and on the northern flank of the Alps. South of a line from the Rhône to the Rhine, the entire snowpack is often faceted and loose. In these regions, avalanches can release deeper in the snowpack.

On Sunday, many avalanches, some large in the west, were triggered by human activity, some remotely over relatively long distances. Whumpfing sounds were very prevalent. The probability of triggering slab avalanches is decreasing only slowly and will require patience. Dangerously large avalanches can still be easily triggered by human activity, especially on the northern flank of the Alps, in Valais and in northern Grisons.

During the night to Monday and on Monday morning, some regions in the north saw a little precipitation. The snowfall level rose to 1600 m. Otherwise, it was mostly cloudy in the north. There were sunny intervals in the inneralpine regions and conditions were mostly sunny in the south.

Fresh snow

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Temperature

Rising markedly, reaching between 0°C in the west and north and -4°C in the south at midday at 2000 m

Wind

During the night to Monday the westerly wind freshened and once again became moderate to strong.

On Tuesday, conditions will be very sunny in the north and mostly cloudy in the south.

Fresh snow

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Temperature

At midday at 2000 m, between +4°C in the north and -2°C in the south

Wind

Southwesterly:

• sometimes strong overnight at high altitudes on the northern flank of the Alps, otherwise moderate
• strong at times in the Jura
• foehn in the north

On Wednesday, conditions will again be mostly sunny in the north at first, becoming increasingly cloudy in the afternoon. The southwesterly wind will freshen up again at high altitudes and in the Jura. There will be some rain, especially in the Jura, until Thursday morning. Thursday will be quite sunny. Conditions will be very cloudy in the south on both days.

The risk of dry avalanches will decrease further, but only very slowly in the areas south of a line from the Rhône to the Rhine due to the weak old snowpack. Avalanche risk will not change significantly on the southern flank of the Alps.