Upper Susa and Chisone Valleys

New snow and wind slabs at intermediate and high altitudes.

New snow and wind slabs at intermediate and high altitudes.

Above approximately 1200 m snow fell in the last two days. The new snow-covered wind slabs will become increasingly prone to triggering in particular on steep northwest, north and northeast facing slopes above approximately 2200 m. Several 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. In particular very steep sunny slopes as well as wind-loaded slopes: Medium-sized and, in isolated cases, large dry and moist avalanches are possible as a consequence of solar radiation.

10 to 25 cm of snow has fallen since Friday 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.