Aigle-Leysin

In the west and in the north a critical avalanche situation will prevail.

Snowpack

The large amounts of fresh fallen snow from region to region over the weekend are consolidating incrementally. However, in many places the snow is still quite loosely-packed. Above the timberline the snow in many places has been deposited accompanied by severe wind impact, thus, highly irregularly. In those places more than anywhere else, the conditions are relatively favourable for the next round of fresh snow to be deposited on top of it. At mid-level inside the snow cover there are crusts evident which were generated by repeated bouts of rainfall and subsequently dropping temperatures. These layers are generally compact and stable; nevertheless, in some places there are embedded weaker layers evident.

Weather forecast through Tuesday, 28.11.2023

On Monday night the precipitation is expected to intensify in the northern regions. During the daytime hours on Tuesday it will snow down to approximately 600 m, particularly intensively in the western regions and on the northern Alpine Ridge. In central Ticino and southern Ticino it will be predominantly sunny.

Fresh snow

Above approximately 1000 m the following amounts of fresh snow are anticipated:

• furthermost western part of the Lower Valais, northern Alpine Ridge: 40 to 60 cm;
• remaining sectors of the northern flank of the Alps and of the Valais, Prättigau, Silvretta, Samnaun as well as the western Jura region: 20 to 40 cm;
• remaining parts of northern Grisons and of the Engadine, as well as the eastern part of the Jura region: 10 to 20 cm;
• in the other regions of Switzerland, less.

Temperature

Temperatures are expected to drop, at midday at 2000 m, to between -9 °C in the northern regions and -5 °C in the southern regions.

Wind

Winds will be blowing at strong to storm velocity, shifting from westerly to northwesterly.

Observed weather review Monday, 27.11.2023

In the northern regions skies were heavily overcast for the most part. Further towards the south it was quite sunny until well into the afternoon hours.

Fresh snow

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Temperature

At midday at 2000 m, between -1 °C in the western regions and -3 °C in the eastern regions.

Wind

Winds were blowing from southwesterly directions and increased in velocity,

• in the northern regions to strong to storm strength;
• on the southern flank of the Alps blowing at light to moderate strength.

Outlook through Thursday, 30.11.2023Wednesday

On Tuesday night the precipitation will come to an end. During the course of the day on Wednesday it will temporarily turn quite sunny. The westerly winds will slacken off somewhat. Avalanche danger levels are expected to gradually decrease.

Thursday

Skies will be heavily overcast and precipitation is anticipated over widespread areas with the focal point in the western regions. The precipitation will be persistent and intensive in the furthermost western part of the Lower Valais more than anywhere else. The snowfall level will ascend to nearly 2000 m. In the eastern regions there will be foehn impact and only a small amount of precipitation. Avalanche danger levels will again increase in the western regions, significantly so in the furthermost part of the Lower Valais.