Waadtländer Voralpen

In the northeast a considerable avalanche danger will prevail.

The Bise wind has transported the new snow. The wind slabs can be released by a single winter sport participant in some cases. The avalanches are rather small. Backcountry touring calls for careful route selection.

Snowpack In the central and eastern sectors of the northern flank of the Alps more than anywhere else, fresh snowdrift accumulations were generated at elevated altitudes on Friday night as a consequence of the fresh fallen snow accompanied by westerly winds. The snowfall on Saturday night was deposited with little wind impact, so that it can subsequently be transported to an intensive degree by rising bise winds on Sunday afternoon. Further to the west, the snow which has been deposited is unlikely to be transported. The snowdrift accumulations will be deposited on top of a rough-hewn and, therefore, favourable snowpack surface over widespread areas. Only on wind-protected high-altitude shady slopes will the snowdrift accumulations be deposited atop an expansively metamorphosed (faceted) and loose, therefore, less favourable snowpack surface. In the southern Valais and in the Grisons on northern slopes, the entire snow cover is expansively metamorphosed (faceted) and loose to a large degree. Snow depths throughout the Swiss Alps are far below average. At high altitudes in the flat fields where the measurement station devices make their recordings, they amount to only half of the customary values. Observed weather review Sunday, 26.02.2023 In the western regions at heightened altitudes it was partly sunny, in the other regions of Switzerland skies were predominantly overcast. During the night there was snowfall in the northeastern regions more than anywhere else, subsequently during the afternoon in the southern Valais. The snowfall level was in the low lying areas. Fresh snow Between Saturday afternoon and Sunday afternoon, the following amounts of fresh snow were registered:

• on the northern flank of the Alps from the Titlis over the Glarus Alps as far as the Alpstein: 10 to 20 cm;
• from the northern Prättigau as far as the Silvretta, as well as from Monte Rosa as far as the Simplon region: 5 to 10 cm;
• in the remaining regions of Switzerland, less; or else it remained dry.

Thus, on the northern flank of the Alps from the Titlis over the Glarus Alps as far as the Alpstein, overall 30 to 40 cm of fresh fallen snow has been registered above approximately 2000 m since Friday midday, more in some places in the Alpstein. Temperature At midday at 2000 m, -13 °C in the northern regions and -8 °C in the southern regions. Wind

• Winds on Saturday evening were blowing at moderate strength, from place to place at strong velocity, from westerly directions;
• subsequently, winds were blowing at moderate strength, intensifying in strength during the course of the day in the western Prealps, from northeasterly directions.
• In the southern regions winds were blowing at moderate to strong velocity from northerly directions.

Weather forecast through Monday, 27.02.2023 Particularly during the nocturnal hours, a small amount of snowfall is anticipated from region to region down to the low lying areas. During the daytime hours in the western sector of the northern flank of the Alps and in the Valais, it will be rather sunny. In the remaining regions of Switzerland there will be sunny intervals expected in the southern regions. Fresh snow Between Saturday afternoon and Sunday afternoon in the Valais part of the Main Alpine Ridge, 5 cm of fresh fallen snow is anticipated from region to region; in the other regions, less. Temperature At midday at 2000 m, -6 °C in the northern regions and -9 °C in the southern regions. Wind

• During the night on the northern flank of the Alps and in the western part of the Prealps, storm-strength northeasterly winds will be blowing, in the other regions winds will be blowing at moderate strength.
• During the daytime hours along the Prealps, moderate to strong-velocity bise winds will be blowing. In the other regions of Switzerland, generally moderate-strength southerly winds will prevail.

Outlook through Wednesday, 01.03.2023 On Tuesday in the southern regions skies will be overcast, accompanied by a small amount of snowfall; in the other regions it will be partly sunny. The zero-degree level will ascend to approximately 2000 m. On Wednesday it will be predominantly sunny in the mountains. Winds will be blowing at light to moderate strength on both days. Avalanche danger levels are expected to incrementally decrease.