An exceptionally warm and most air mass will reach the Swiss Alps on Wednesday. In the north and in Valais there will be heavy
precipitation. The snowfall level will rise significantly, to approximately 2800 m in the west and to approximately 2500 m
in the east. In the high Alpine regions in the north and Valais, 50 to 80 cm of snow is likely to fall, but smaller amounts
are expected in Grisons and the south. The amounts of precipitation remain uncertain. In the far south it will be dry and
mostly sunny.
The wind will be strong to storm force from the west to northwest and transport large quantities of fresh snow.
The danger of both wet snow and dry avalanches will increase significantly. In the regions north of a line between the Rhone
and Rhine (excluding both the Prealps and the Jura), and in Valais, the Gotthard region, northern Grisons and northern Lower
Engadine, danger level 4 (high) is likely to be reached over a wide area. The avalanche prone locations will be very widespread;
as a consequence of intense rainfall, both a large number of often large wet snow avalanches and, at elevated altitudes, large
to very large dry avalanches, are to be expected. In the other regions of both Grisons and Ticino, the avalanche danger will
also increase, but less significantly.