Zervreila

In the south, the fresh and drifted snow is being deposited on an unfavourable snowpack. Avalanches can be triggered not only in the fresh snow, but also in deeper layers of the snowpack. Avalanches can also still be triggered deeper in the snowpack in many areas in the inneralpine regions of Valais and Grisons.

North of a line from the Rhone to the Rhine, strong southerly winds are causing snowdrift accumulations, some of which are prone to triggering. In the west, these are growing larger with the fresh snowfall. Weak layers deeper in the old snowpack are somewhat rarer and less prone to triggering in these regions.

After a mostly clear night, clouds rapidly gathered in the west. In the east and south, conditions remained very sunny into the afternoon.

Fresh snow

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Temperature

At midday at 2000 m, between +4°C in the north and -3°C in the south

Wind

• Moderate to strong southwesterly in the north overnight, elsewhere light to moderate
• During the day, widespread moderate to strong southerly at high altitudes; moderate foehn winds at times in the valleys of the north

Snow will fall on the Main Alpine Ridge and south of there. The snowfall level will drop briefly to 500 m and will be at between 800 and 1000 m during the day. The north will see intermittent light precipitation, which will be more persistent in western Jura. Regions exposed to the foehn wind in central and eastern Switzerland will remain mostly dry. In the north the snowfall level will rise briefly to 1500 m in the Jura and will be around 800 m in all regions during the day.

Fresh snow

From Tuesday evening to Wednesday afternoon, above approximately 1400 m:

• Main Alpine ridge from Val Bregaglia to the Bernina Pass, Sotto Ceneri: 15 to 30 cm
• western Jura, rest of the Main Alpine Ridge from the Great St Bernard Pass to Upper Engadine, rest of Ticino: 10 to 20 cm
• otherwise a widespread 5 to 10 cm, and mostly dry from the Bernese Oberland to Liechtenstein and in Prättigau

Temperature

At midday at 2000 m, between -3°C in the west and south and 0°C in the east

Wind

• Strong southerly at night, with a strong foehn wind in the Alpine valleys in the north
• Dying down during the day, becoming mostly light to moderate southerly

Thursday

Overnight to Thursday, 5 to 15 cm of snow will fall down to low altitudes in the north and in Grisons. During the day conditions will quickly brighten in the west and south, but will remain cloudy for longer in the east with light snowfall. The wind will be a light to moderate westerly to northerly. Avalanche risk will increase somewhat in the north.

Friday

Around 10 cm of snow will fall in the west. In the east conditions will become increasingly cloudy and there will be light snowfall at times. The snowfall level will be around 1000 m. In Grisons and Ticino, conditions will remain sunny for longer and dry into the evening. The wind will be a light to moderate westerly to northwesterly. There will be hardly any change in avalanche risk.