Persistent weak layers
- Above 2,300 m
- Size
- 2
Stability: poor · Frequency: few
Often favorable conditions apart from weak layers in old snow
Stability: poor · Frequency: few
Stability: very poor · Frequency: few
Often favorable conditions apart from weak layers in old snow
Danger zones occur particularly in shady steep terrain where the snow is shallow and in transitions from shallow to deep snow. Caution: these spots are not recognizable. Glide cracks and settling noises are signals of danger. If avalanches fracture down to deeper layers of the snowpack they can grow to large size. On steep grassy slopes, and on sunny slopes in general, but increasingly frequently also on shady slopes, small-to-medium glide-snow avalanches are possible.
The fresh fallen snow and fresh drifts from the most recent period of precipitation have settled further and consolidated increasingly. On shady slopes it is still mostly loose, on sunny slopes a crust has often formed. On high mostly shady slopes, weak layers are evident inside the old snowpack which avalanches can trigger down to. Snowpack analysis and observations of fractures and isolated artificial triggerings corroborate this.
Nocturnal skies will be star-studded, and thus, very cold. S will be very dry, radiantly sunny. Above the inversion it is mild, with only light winds. At 2000m: 0 to +6 degrees. Mostly light winds.
Sunny and mild in the mountains, avalanche danger levels not expected to change significantly
Bulletin data: Avalanche Warning Service Vorarlberg (CC BY 4.0)