Persistent weak layers
- Above treeline
- Size
- 2
Stability: poor · Frequency: many
Wind slabs and weakly bonded old snow represent the main danger.
Stability: poor · Frequency: many
Up to 15 cm of snow, and even more in some localities, has fallen. Up to 15 cm of snow, and even more in some localities, will fall. As a consequence of a strong to storm force wind from southwesterly directions, further wind slabs formed. They are lying on surface hoar in some places in particular on shady slopes above the tree line. The somewhat older wind slabs are lying on top of a weakly bonded old snowpack in particular on shady slopes above the tree line. The old snowpack is faceted and weak. This applies especially in shady places that are protected from the wind. Whumpfing sounds and the formation of shooting cracks when stepping on the snowpack are a clear indication of a weakly bonded snowpack.
Hardly any decrease in avalanche danger. The current avalanche situation calls for caution and restraint.
Wind slabs and weakly bonded old snow represent the main danger.
As a consequence of snowfall and the strong to storm force southwesterly wind, the snow drift accumulations have increased in size. The fresh wind slabs will be covered with new snow and therefore difficult to recognise. The fresh snow and the wind slabs formed during the snowfall are lying on top of a weakly bonded old snowpack on west, north and east facing slopes above the tree line. Caution is to be exercised in particular in gullies and bowls, and behind abrupt changes in the terrain, as well as in places that are protected from the wind. Especially here avalanches can be triggered in the faceted old snow. This applies in case of a single winter sport participant. In some cases avalanches are medium-sized. Remotely triggered avalanches are possible in isolated cases. Whumpfing sounds and the formation of shooting cracks when stepping on the snowpack serve as an alarm indicating the danger.
Bulletin data: Avalanche Warning Service South Tyrol, avalanche.report (CC BY 4.0)