Wind slab
- Above treeline
Beware of fresh wind slab!
Beware of fresh wind slab!
The avalanche risk is moderate above the tree line. Fresh snowdrift accumulations can be triggered as small to medium-sized avalanches by individual winter sports enthusiasts in all aspects. The avalanche prone locations are mainly in gullies, bowls and behind terrain edges. Very occasionally, avalanches can also tear through layers close to the ground. Take particular care on very steep western, northern and eastern slopes at high altitudes. Transitions from a little to a lot of snow are particularly unfavourable.
10 to 20 cm of new fallen snow will be transported by strong to stormy north-westerly winds during the day. Fresh snowdrift accumulations are often deposited on a sufficiently stable old snowpack above the tree line. Weak layers are in the bound layer or transition to the old snow, at higher altitudes in places still in the persistent weak layer (faceted crystals in the area of crusts) or occasionally in layers close to the ground in the form of floating snow.
A striking cold front will move across Styria in the early hours of the night. There will be snow showers and brisk to stormy gusts of wind from the north-west. Thursday will be wintry. It will snow all day, especially in the northern Alps and the Niedere Tauern. To the south, the precipitation may be less heavy, with 5 - 15 cm of new fallen snow. Visibility is very limited. In addition, stormy northerly winds will blow from the main Alpine ridge southwards, becoming gale-force in exposed high altitudes. On the southern side of the Alps, the snowfall will weaken in the afternoon and take breaks. The temperature at 2000 metres will be between -1 and -7 degrees, at 1000 metres between -3 and +2 degrees.
Still stormy, significant increase in fresh snow in the north-east. The wind slab problem is getting worse!
Bulletin data: Avalanche Warning Service Styria (CC BY 4.0)