Gruyère

In the last two days, new fallen snow and sometimes strong northeasterly winds have created snowdrift accumulations that are prone to triggering. These are sometimes large in the north, where the most snow fell (up to 50 cm), while in the other regions they are small to medium in size. Deeper in the snowpack, there are faceted weak layers prone to triggering, especially on shady slopes above approximately 2400 m and generally in the high Alpine regions. Avalanches may also be triggered in these deeper layers in places.

Sunday

Clouds will gather rapidly in the west on Sunday, while it will remain sunny for longer in the east. The wind will shift to the west and will be strong in the north and west, moderate in the south. At 2000 m, the temperature will increase to around -2°C in the north and -6°C in the south. The avalanche danger will not change significantly. Fresh and somewhat older snowdrift accumulations will be prone to triggering in places. In addition, avalanches may be triggered in deeper layers of the snowpack, especially on north-facing slopes above 2400 m and in the high Alpine regions.

Monday

Precipitation will set in from the west on Sunday evening. There will be widespread precipitation during the night and on Monday, heavy in the west. The snowfall level will be between 900 and 1300 m. In western Lower Valais and the Vaud Alps, 40 to 60 cm of snow will fall by Monday evening, 15 to 30 cm in the rest of Valais and on the northern flank of the Alps. There will be moderate to strong southwesterly winds. With new fallen snow and southwesterly winds, snowdrift accumulations will form that are prone to triggering. The avalanche danger will increase in the north, appreciably so in the west. Naturally triggered avalanches will be increasingly possible in the regions exposed to heavier precipitation in the west. In the east and south, the avalanche danger will not change significantly.