Middle Lys Valley

Until Monday the weather will be exceptionally warm.

Until Monday the weather will be exceptionally warm.

Outgoing longwave radiation during the night will be reduced. The avalanche danger will increase quickly in the early morning. Backcountry tours should be started and concluded very early. As a consequence of warming during the day and solar radiation moist and wet avalanches are to be expected as the day progresses. This applies in particular on very steep slopes below approximately 3500 m, as well as at the base of rock walls. Occasionally large natural avalanches are not ruled out. On wind-loaded slopes the avalanches can penetrate even deep layers. In the typical avalanche paths here the avalanches can in some cases reach low altitudes. The wind slabs must be evaluated with care and prudence at high altitude. These places are clearly recognisable to the trained eye. Backcountry tourers or freeriders can release avalanches. In particular on shady slopes the avalanches can penetrate even deep layers.

5 to 10 cm of snow fell on Wednesday. The sometimes strong wind has transported the new snow. The surface of the snowpack will freeze to form a strong crust only at high altitudes. Sunshine and high temperatures will give rise from early morning to rapid moistening of the snowpack. The upper section of the snowpack is unfavourably layered. Several medium-sized dry and wet avalanches have been released in the last two days.

On Sunday it will be very warm. The surface of the snowpack will already be soft in the early morning.