Corvatsch

In high Alpine regions a considerable avalanche danger will be encountered in some regions.

50 to 80 cm of snow has fallen since Thursday above approximately 3500 m. As a consequence of a moderate to strong southwesterly wind, extensive wind slabs formed in high Alpine regions. 10 to 20 cm of snow will fall until Saturday above approximately 2800 m. The wind slabs of Friday will be covered with new snow and therefore difficult to recognise. Single persons can release avalanches. These can reach dangerously large size in particular on steep north facing slopes. On north facing slopes individual natural avalanches are possible during the night. The conditions in high Alpine regions are unfavourable.

Snowpack Over widespread areas snowfall has fallen on bare ground. Only on glaciated north-facing slopes above 3500 m was there generally a cohesive area-wide old snowpack prior to the precipitation. In those areas, the snowpack consists of several layers in the interim, for which reason extensive flat-ground avalanches are also possible in the major areas of precipitation, where the danger levels are expected to decrease less swiftly. Observed weather review Friday, 22.09.2023 Weather forecast through Saturday, 23.09.2023 Outlook through Monday, 25.09.2023 Sunny weather is expected. The zero-degree level will ascend to an extremely high altitude on Monday: 4500 m. The danger of dry-snow avalanches will decrease. Caution is urged in evaluating glaciated north-facing slopes above approximately 3500 m. As a consequence of the higher daytime temperatures and solar radiation, moist-snow avalanches can be expected, most of all in the high alpine regions of the central and eastern sectors of the northern flank of the Alps and in Grisons. These releases will frequently grow to medium size. In the remaining regions of Switzerland, moist snowslides will be possible.