Osterhorn Group,Gamsfeld Group

Combined wet and persistent weak layer problem

Combined wet and persistent weak layer problem

The avalanche risk is low in the morning and quickly increases to level 2, moderate, as the snowpack softens. Naturally triggered avalanches become possible with daytime changes. There is also a slight persistent weak layer problem from around 1600 metres where the old snowpack has survived. Be careful in the higher summit areas, where prone-to-triggering snowdrift accumulations still lie behind blown-off areas. The sliding snow activity is increasing.

The upper part of the snowpack is made up of several layers of new fallen snow from the last week, which was influenced by the wind. Where there was a significant old snowpack before the snowfall, the foundation has been completely transformed and is cohesionless. Fractures primarily occur between the last snow packs, but can penetrate through to this deep snow pack under greater load. During the night, a mostly stable melt cover forms, which softens quickly during the day with the warmth. During the daytime changes, the snowpack usually reaches isothermal conditions.

Friday night will be dry and clear with little wind. Above the lakes of cold air in the valleys, it will remain quite mild again with significant plus temperatures at low and medium altitudes. Few changes on Friday, the wind will remain light and visibility will be excellent. During the day, cloudless skies can often be expected, with only occasional fog in the valleys. At 2000 metres around 6 or 7 degrees, at 3000 metres just below 0 degrees.

Only a slow decline in avalanche danger due to melting snow.