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 1900 m. On steep shady slopes the avalanches can be released in deep layers of the snowpack and reach large size in some cases, especially in gullies and bowls, and behind abrupt changes in the terrain. Avalanches can in some places be released by small loads and reach medium size.

10 to 25 cm of snow, and even more in some localities, will fall until Saturday above approximately 1500 m. Faceted weak layers exist in the bottom section of the snowpack on shady slopes. Especially sunny slopes as well as low and intermediate altitudes: The upper section of the snowpack is largely stable and its surface has a crust that is strong in many cases.

As a consequence of the new snow the avalanche prone locations will become more prevalent during the night.