Tonight the outgoing longwave radiation will be reduced and the crust will therefore be thinner than on recent days. Warming
during the day will thaw the crust quickly and weaken the snowpack. Both wet snow and gliding avalanches can occur. In recent
days only a few wet snow avalanches have been reported despite the mild and sunny weather.
In particular in the inneralpine and southern regions of Grisons and in southern Valais, distinct weak layers exist deep in
the snowpack. Here, slab avalanches consisting of moist and wet snow can be released in these layers or, in some cases, be
triggered by people. Isolated such occurrences have been observed in Grisons in particular.
The snowpack is thoroughly moist on north facing slopes below approximately 1800 m, on east facing slopes below approximately
2500 m, on south facing slopes up to more than 3000 m, and on west facing slopes below approximately 2800 m. Given the persistence
of dry weather conditions, however, only very little melt water is penetrating the snowpack.
In general, the quantity of snow lying on the ground is small; exceptionally little snow is lying in the south. In view of
the thin and in many cases faceted snowpack, on glaciers there remains an elevated risk of falling into a crevasse, especially
in southern Valais.