Valgrisenche

New snow above approximately 2300 m. The danger will increase during the day. The conditions are dangerous for backcountry touring outside marked and open pistes.

New snow above approximately 2300 m. The danger will increase during the day. The conditions are dangerous for backcountry touring outside marked and open pistes.

50 to 80 cm of snow, and even more in some localities, will fall above approximately 2400 m. As the snowfall becomes more intense the prevalence and size of the avalanche prone locations will increase in the afternoon. The sleet will give rise to thorough wetting of the snowpack over a wide area below approximately 2700 m. The new snow will become increasingly prone to triggering in all aspects. These conditions will foster a rise in the danger of dry and wet avalanches as the day progresses on steep slopes. In particular in the evening large natural avalanches, capable of reaching a long way, must be expected. Avalanches can in some cases be released in deep layers and reach large size.

Above approximately 2300 m snow fell in the last few days. The high humditiy gave rise to moistening of the snowpack over a wide area below approximately 2800 m. The sleet gave rise to thorough wetting of the snowpack over a wide area in all aspects below approximately 2700 m. Towards its base, the snowpack is wet, also on shady slopes below approximately 2700 m. Outgoing longwave radiation during the night will be barely evident. The surface of the snowpack will cool hardly at all during the overcast night and will already be soft in the early morning. A lot of snow will fall until Thursday. The spring-like weather conditions will give rise to increasing and thorough wetting of the old snowpack in particular below the tree line. Over a wide area new snow is lying on a wet snowpack.

Heavy snowfall to intermediate altitudes. Rain to 1800 m. In some localities increase in avalanche danger as the snowfall becomes more intense.