Wind slab
- All elevations
Main danger: fresh snowdrift accumulations
Brisk to strong NE/E winds will make it feel even colder on Sunday. Compact cloudbanks will bring a bit of snowfall from Kleinwalsertal over the Arlberg regions into the Verwall. Elsewhere it will remain dry. Avalanche danger levels are not expected to change significantly.
Main danger: fresh snowdrift accumulations
Avalanche danger above 1500 m is moderate, danger below that altitude is low. Triggering fresh snowdrift accumulations is possible even by minimum additional loading. The fresh snowdrifts are triggerable mostly on NW/N/E facng slopes. Danger zones occur esp. in steep ridgeline terrain, in gullies, bowls and behind abrupt discontinuities in the terrain. The frequency of danger zones increases with ascending altitude.
There was 25-30 cm of fresh snow registered last night, accompanied by strong winds, deposited atop a springlike snowpack surface, dominated by melt-freeze crusts. Therefore, the fresh fallen snow will bond well with the rough-hewn surfaces. The stability of the snowpack is worse in wind-protected shady terrain at high altitudes due to the expansively metamorphosed (faceted) layers and wherever the fresh snow is blanketed by fresh snowdrifts. At intermediate altitudes there is little snow on the ground. At low altitudes the fresh snow was often deposited on bare ground.
Nocturnal hours: snowfall and wind throughout the night, the snowfall level descending to 900-700 m by morning. Saturday: snowfall continuing into the morning hours, then easing. In the afternoon it will remain dry but overcast. Only minor amounts of fresh fallen snow, on the Arlberg about 25 cm. Due to wind and cold, the fresh snow will be intensively transported. At 2000 m: -5 degrees. Initially strong W/NW winds, later slackening off.
Bulletin data: Avalanche Warning Service Vorarlberg (CC BY 4.0)