Osterhorn Group,Gamsfeld Group

Low old and moderate wet snow problem

Low old and moderate wet snow problem

The avalanche risk is low in the morning and quickly rises to level 2, moderate, as the snowpack softens. Naturally triggered avalanches become possible with daytime changes, and medium avalanches are still possible in isolated cases. There is also a slight persistent weak layer problem from around 1600 metres where the old snowpack has survived. Avalanches usually remain small, but can be triggered by individuals. Be careful in the higher summit areas, where prone-to-triggering snowdrift accumulations can still be found on shady slopes behind blown-off areas. There is little sliding snow activity.

A stable surface crust usually forms overnight, but softens quickly during the day. Underneath, there are several layers of mostly well-settled wind slabs that have already been moistened in the last few days (from the last big snowfalls at the beginning of the week). Where there was an old snowpack before the snowfall, it still contains weak layers of large faceted crystals, especially near the ground. During the day changes, the snowpack reaches isothermal temperatures in many places.

Saturday night will be clear and windless, with zero-degree levels at around 2800 metres. On Saturday, the sun will once again shine frequently, with a few thin, high patches of cloud moving across the sky at times and not disturbing visibility. The wind will blow weakly to moderately from different directions, reaching a maximum of 40 to 50 km/h at high altitudes. It will remain very mild, reaching around 6 degrees at 2000 metres and 1 degree at 3000 metres.

Only slow decrease in avalanche danger due to melting snow. Outgoing longwave radiation on Sunday night is severely limited.