Persistent weak layers
- Above 1,800 m
Weakly bonded old snow represents the main danger. The avalanche conditions are to some extent treacherous.
Weakly bonded old snow represents the main danger. The avalanche conditions are to some extent treacherous.
Weak layers in the old snowpack can be released even now by individual winter sport participants. The avalanche prone locations are to be found in all aspects above the tree line, also in areas close to the tree line. The avalanche prone locations are barely recognisable, even to the trained eye. In little used terrain the avalanche prone locations are more prevalent. In isolated cases the avalanches are large, in particular in the regions with a lot of snow in the north. At transitions from a shallow to a deep snowpack, when entering gullies and bowls for example the likelihood of avalanches being released is greater. As a consequence of a freshening northerly wind, mostly small wind slabs will form adjacent to ridgelines. The fresh wind slabs can be released in isolated cases on steep shady slopes. As a consequence of warming during the day and solar radiation individual gliding avalanches and moist snow slides are possible as the day progresses. Backcountry touring and other off-piste activities call for experience in the assessment of avalanche danger.
The snowpack will be in some cases prone to triggering. Faceted weak layers exist in the old snowpack in all aspects. This applies especially on steep shady slopes above the tree line, and in areas close to the tree line, also on steep sunny slopes in high Alpine regions. Stability tests and field observations confirm that the stability of the snowpack varies greatly within a small area. In steep terrain there is a danger of falling on the hard snow surface.
Sunday: The avalanche conditions remain to some extent treacherous. Slight increase in danger of gliding avalanches and moist snow slides as a consequence of warming during the day and solar radiation.
Bulletin data: Avalanche Warning Service Tirol, avalanche.report (CC BY 4.0)