Alert period and areas
There are alerts from northern Valais to the Rax, with the core simulated uniformly in the crystal ball from central Switzerland to the Arlberg. The alert runs from Sunday morning to Tuesday morning (25.12.), with everything already over in the west on the evening of 24.12. and the last flakes still falling in the east on 25.12. in the morning.
Snowfall limit
Well, that's difficult. It will rise in the course of Sunday morning to 2000m in the west in France and the Swiss Alps and to 1400-1600m further east in Austria and partly within the Alps.
The snow line will then fall again to around 1000m in the far west and to the very bottom in the east. More snow tends to fall in the east in cool conditions. The quasi-full amounts come from 1600-2100m.