Persistent weak layers
- Above treeline
- Size
- 3
Stability: very poor · Frequency: many
Natural avalanches are to be expected.
Stability: very poor · Frequency: many
Stability: poor · Frequency: some
A dangerous avalanche situation will be encountered over a wide area.
Weak layers in the upper part of the snowpack can be released over a wide area easily by individual winter sport participants in particular above the tree line. The avalanche prone locations are numerous and are barely recognisable, even to the trained eye. To some extent avalanches can also penetrate deep layers and reach large size. In particular on wind-loaded slopes natural avalanches must be expected, this applies in particular during the course of the night. Remotely triggered avalanches are possible. The danger exists in particular in alpine snow sports terrain. Whumpfing sounds and the formation of shooting cracks when stepping on the snowpack and fresh avalanches serve as an alarm indicating the danger. Great caution and restraint are required.
Up to 50 cm of snow will fall. The wind will be strong at times. The old snowpack is faceted. Over a wide area new snow and wind slabs are lying on a weakly bonded old snowpack. The various wind slabs have bonded poorly with each other and the old snowpack.
The danger of natural avalanches will decrease. Avalanches can as before be released very easily and reach large size in isolated cases.
Bulletin data: Avalanche Warning Service Tirol, avalanche.report (CC BY 4.0)