Persistent weak layers
- Above 1,500 m
Pay particular attention to wet snow problems and isolated persistent weak layers
Pay particular attention to wet snow problems and isolated persistent weak layers
The avalanche risk is moderate at higher altitudes. Wet loose snow avalanches can come loose, especially in extremely steep terrain. Spontaneous avalanche activity increases during the day with incoming radiation and warming. Drift snow packs are prone to triggering in high, on shady slopes and can occasionally be triggered as a snow slab in steep slope zones.
The new and drifting snow cover has already settled somewhat and lost some of its proneness to triggering. In shady high altitudes, the old snowpack with crusts and embedded angular crystals is unfavourably structured and weakened in places. Depending on the aspect, the snow becomes damp or wet during the day changes up to high altitudes, leading to a decreasing firmness and destabilisation of the snowpack.
With the influence of high pressure, the high-altitude current will slowly turn to the south-west. Thursday night will often be clear and frost-free at high altitudes. On Thursday, sunny weather will prevail most of the time. However, this will not be completely undisturbed, as a few veil clouds will pass over the sky. The temperature at 2000 metres will be between +3 and +6 degrees, at 1000 metres between +5 and +10 degrees. The north-westerly wind will be moderate on the mountains and strong in places during the daytime changes.
With calm, high-pressure weather, the avalanche risk will slowly decrease towards the end of the week.
Bulletin data: Avalanche Warning Service Styria (CC BY 4.0)