Middle Lys Valley

The new snow is bonding only slowly with the old snowpack. The danger of dry and wet avalanches will already be elevated in the early morning.

The new snow is bonding only slowly with the old snowpack. The danger of dry and wet avalanches will already be elevated in the early morning.

As a consequence of falling temperatures and snowfall above approximately 2000 m a dangerous avalanche situation will develop. The backcountry touring conditions are unfavourable. These meteorological conditions will bring about a rise in the danger of dry and wet avalanches in particular in the regions exposed to substantial precipitation. Especially in starting zones where no previous releases have taken place medium-sized dry and wet avalanches are possible. Caution is to be exercised in particular in areas where the snow cover is rather shallow on very steep north facing slopes above approximately 2800 m. The avalanches can in isolated cases reach intermediate altitudes. The fresh wind slabs are small are to be assessed with care and prudence. These can be released by a single winter sport participant.

Over a wide area 30 to 70 cm of snow, and even more in some localities, will fall above approximately 2400 m. The sleet gave rise on Sunday to a loss of strength within the snowpack. Outgoing longwave radiation during the night will be reduced. The spring-like weather conditions gave rise to rapid moistening of the snowpack over a wide area. These conditions facilitated a substantial settling of the near-surface layers in particular below approximately 2500 m. At high altitudes and in high Alpine regions snow depths vary greatly, depending on the infuence of the wind. Individual weak layers exist in the snowpack in shady places that are protected from the wind, especially above approximately 2400 m.

As a consequence of the ceasing of precipitation there will be only a very slight increase in the danger of dry and wet avalanches.