Avalanche prone locations primarily close to summits and ridges.
Avalanche danger is low. Main problem: snowdrifts that can be triggered as slab avalanches (mostly small) even by minimum additional loading. Avalanche prone locations are located in steep ridgeline terrain in NW/E/SE aspects and in wind-loaded gullies and bowls. Isolated smaller glide-snow avalanches can trigger naturally on steep smooth grassy slopes in all aspects.
Snowpack
Tendency
Danger of small wet avalanches increases due to rainfall.
Danger level
treeline
Avalanche Problem
Wind slab
Treeline
Persistent weak layer
2000m
Number of avalanche prone locations increases with ascending altitude.
Avalanche danger above the timberline is moderate, below that altitude avalanche danger is low. The main problem: snowdrifts that can be triggered as small to medium-sized slab avalanches even by minimum additional loading. Avalanche prone locations are located in steep ridgeline terrain in NW-E-SE aspects as well as in wind-loaded gullies and bowls. At lower altitudes also sometimes in steep forest aisles. At high altitudes, avalanches can in isolated cases fracture down to weak layers embedded in the old snow. Frequency and size of danger zones increase with ascending altitude. Isolated smaller glide-snow avalanches can trigger naturally on steep smooth grassy slopes in all aspects.
Snowpack
On the shady side, new snow and snowdrifts are deposited atop an unfavorable old snowpack surface consisting of expansively metamorphosed crystals, or -- in particular at lower altitudes -- surface hoar. Weak layers can also be embedded in the snowdrifts and are prone to triggering. Snowdrifts are sometimes blanketed by loose snow; difficult to recognize. Due to solar radiation the loose snow looses its firmness. In shady high altitude terrain there are locally weak layers embedded in the old snowpack consisting of graupel or faceted (expansively metamorphosed) crystals. In isolated cases such weak layers are still prone to triggering. The snowpack base is moist down to the ground, gliding movements are not excluded.
Tendency
Increasing danger of wet avalanches as a result of rainfall up to higher altitudes.
Danger level
treeline
Avalanche Problem
Wind slab
Treeline
Gliding snow
Medium-sized avalanches possible
Avalanche danger above the timberline is moderate, below that altitude avalanche danger is low. Main problem: snowdrifts. They can be triggered as medium-sized slab avalanches even by one sole person engaged in winter sports. Avalanche prone locations are located in steep ridgeline terrain in NW-E-SE aspects as well as in wind-loaded gullies and bowls. In some places, avalanche prone locations are also found in steep forest aisles at lower altitudes. Frequency and size of danger zones increase with ascending altitude. At high altitudes, avalanches can in isolated cases fracture down to weak layers embedded in the old snow. Isolated medium-sized glide-snow avalanches can in addition trigger naturally on smooth grass-covered slopes in all aspects.
Snowpack
On the shady side, new snow and snowdrifts are deposited atop an unfavorable old snowpack surface consisting of expansively metamorphosed crystals, or -- in particular at lower altitudes -- surface hoar. Weak layers can also be embedded in the snowdrifts and are prone to triggering. In many places snowdrifts are blanketed by loose snow; difficult to recognize. Due to solar radiation the loose snow looses its firmness. In shady high altitude terrain there are locally weak layers embedded in the old snowpack consisting of graupel or faceted (expansively metamorphosed) crystals. In isolated cases such weak layers are still prone to triggering. The snowpack base is moist down to the ground, thus enabling gliding movements.
Tendency
Increasing danger of wet avalanches as a result of rainfall up to higher altitudes.
