As a consequence of fresh fallen snow and strong-velocity westerly to northwesterly winds, snowdrift accumulations will be generated anew. Both fresh snow and fresh snowdrifts on wind-protected west-facing, north-facing and east-facing slopes will be deposited on top of an unfavourable, expansively metamorphosed (faceted) layer of snow crystals. The old snowpack surfaces in ridgeline terrain, on south-facing slopes and in frequently skied terrain are more favourable.
More deeply embedded inside the snowpack in the Jura region, on the northern flank of the Alps and in the western part of the Lower Valais, thick rain crusts which formed during the last week of the old year are evident up to high altitudes. These thick crusts tend to stabilise the lower layers of the snowpack in these regions. From the central Valais over the northern Ticino as far as Grisons, on the other hand, the entire snowpack is often expansively metamorphosed and riddled with thin melt-freeze crusts. To an increasing degree, you sink down to the ground on your skis. With regard to the approaching snowfall, the structuring of the old snowpack is particularly unfavourable in these regions.

On Saturday night in the central and eastern parts of the Prealps above 1300 m, there was a small amount of snowfall. During the daytime on Sunday in the western regions, in the Valais, in the Ticino and in the Engadine, it was predominantly sunny. In the remaining regions of Switzerland there were increasingly frequent bright intervals. In the northeastern regions skies remained predominantly overcast.

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At midday at 2000 m, between +4 °C in the western and the southern regions and -4 °C in the eastern regions.

Winds were westerly to northerly,

• blowing mostly at strong velocity at high altitudes, intermittently at storm strength;
• blowing at light to moderate strength in the furthermost western regions.

Following a night of partially clear skies, snowfall will rapidly set in from the north and fall down to low lying areas. In central Ticino and Sotto Ceneri it will be quite sunny.

By Monday evening:

• on the northern Alpine Ridge from the Wildstrubel to the Alpstein: 10 to 20 cm;
• Jura region, remaining parts of the northern flank of the Alps, Valais not including southern Simplon region, Gotthard region, northern Grisons, Lower Engadine north of the Inn: 5 to 10 cm;
• in the other regions of Switzerland: only a few centimetres; in the furthermost southern regions it will remain dry.
  

At midday at 2000 m, between -8 °C in the northern regions and -4 °C in the southern regions, temperatures dropping further during the course of the afternoon.

Winds still be blowing at strong to storm velocity, initially from westerly directions, shifting to northwesterly during the course of the day.