Weak layers exist near the base of the snowpack in particular on west, north and east facing slopes above approximately 2200
m. In western Lower Valais and on the northern flank of the Alps, the weak old snow is mostly embedded so deep that the probability
of avalanches being released by people is rather small. From central Valais through Ticino to Grisons and generally in places
with shallow snow cover, the bonding of the snowpack is least favourable, and people can still release avalanches in the old
snowpack. In addition, in particular on the main Alpine ridge, last weekend’s snow drift accumulations remain prone to triggering
in some places.
Gliding avalanche activity is high, and further gliding avalanches are to be expected in the coming days as well. They can
be released at any time of day or night. In the western and northern regions with a lot of snow, these can reach a large size
in some cases. On steep south facing slopes, the surface of the snowpack will become moist because of its exposure to warming
and radiation during the day. Here, the mostly clear skies on Tuesday night will give rise to a melt-freeze crust on the surface
of the snowpack.