Last week 150 to 200 cm of snow fell above approximately 2000 m over a wide area of the north and of the far west; elsewhere 40 to 100 cm fell over a wide area. The fresh snow and snow drift accumulations originating from this period are settling to an increasing extent. This snow is lying on a shallow, soft old snowpack containing faceted snow crystals. The structure of the snowpack is least favourable in places where the weak old snow layer is covered by only a shallow layer of snow. This applies in particular on west, north and east facing slopes. Most avalanches of recent days were released in this weak old snow. Fresh snow and sometimes strong wind will give rise to snow drift accumulations on Wednesday. In many cases these will be prone to triggering.

On Monday night snow fell in the north over a wide area, even at low altitudes. In the course of the morning it became increasingly sunny from the west. The south was dry and mostly sunny during the day.

From Monday night until Tuesday midday:

• Central and eastern parts of the northern flank of the Alps: 15 to 20 cm
• Western part of the northern flank of the Alps and Valais, as well as northern Grisons: 5 to 15 cm
  
• Elsewhere: a few centimetres or none
  

At midday at 2000 m: between -4 °C in the west and -9 °C in the east

• Moderate to strong from the west to northwest
• Easing as the day progresses

On Tuesday night, precipitation will arrive from the west. The snowfall level during the night will be 1200 m for a while, otherwise approximately 800 m. During the day, snow will fall over a wide area; in some cases the snowfall will be heavy.

From Tuesday evening until Wednesday afternoon:

• Western and central parts of the northern flank of the Alps, as well as the extreme west of Lower Valais and the Jura: 20 to 30 cm, but up to 40 cm in the far west
  
• Eastern part of the northern flank of the Alps, rest of Valais, southern flank of the Alps: 10 to 20 cm
• Elsewhere: a few centimetres
  

• Falling during the day
• At midday at 2000 m: between -7 °C in the west and -4 °C in the east
  

• In the north:
  - During the night, moderate to strong from the southwest
  - In the valleys exposed to the foehn wind, the foehn will persist until the morning
  - During the day, light to moderate from the west
  

• In the south:
  - Light to moderate, at elevated altitudes sometimes strong, from southerly directions