Upper Susa and Chisone Valleys

Old wind slabs in particular on steep shady slopes. Weakly bonded old snow at intermediate and high altitudes.

Old wind slabs in particular on steep shady slopes. Weakly bonded old snow at intermediate and high altitudes.

Above approximately 1300 m snow will fall until Sunday. As a consequence of the snowfall the prevalence and size of the avalanche prone locations will increase. The new snow-covered wind slabs will become increasingly prone to triggering in particular on steep northwest, north and northeast facing slopes above approximately 2100 m. Medium-sized and, in isolated cases, large avalanches are possible as a consequence of new snow and strong wind. On steep shady slopes the avalanches can be released in deep layers of the snowpack and reach large size in some cases. New snow and wind slabs can over a wide area be released by small loads and reach large size in isolated cases, especially in gullies and bowls, and behind abrupt changes in the terrain.

5 to 15 cm of snow has fallen since Friday above approximately 1800 m. 10 to 20 cm of snow, and even more in some localities, will fall on Sunday above approximately 1800 m. Faceted weak layers exist in the bottom section of the snowpack on shady slopes. The snowpack remains generally prone to triggering. New snow is lying on the soft surface of an old snowpack.

With the end of the precipitation, the natural avalanche activity will gradually decrease.