Weisseck, Muhr Valley

On shady slopes isolated danger zones due to weak layers in old snow. Evaluate fresh snowdrifts with caution.

On shady slopes isolated danger zones due to weak layers in old snow. Evaluate fresh snowdrifts with caution.

Avalanche danger as of 2400m is moderate, danger is low below that altitude. On shady slopes at high and high-alpine altitudes, small-to-medium slab avalanches can be treiggered in the old snow. In addition, small, fresh snowdrift accumulations will be generated near ridgelines during the course of the day. Danger zones occur mostly in transitions from shallow to deep snow, e.g. at the edge of gullies and bowls and behind protruberances in the landscape. Danger zones tend to increase with ascending altitude. The weight of one persons is sufficient to trigger a slab in steep terrain.

At high and high alpine altitudes, fresh and older snowdrift accumulations have been deposited on the surfaces atop loosely-packed layers of older snow or atop surface hoar, both of which are prone to triggering. Beneath these layers, the snow which has persisted since September and November as fundament is weakened by layers of faceted crystals. The snow is distributed highly irregularly: ridges are often totally windblown, but elsewhere the fresh fallen snow also doesn’t cover the base.

On Friday, sunshine will prevail from early morning to evening, high-fog could in isolated cases reduce visibility somewhat in the valleys. Winds will be mostly light to moderate, although brisk foehn winds will arise during the course of the day at high altitudes (reaching 50 km/hr). At 2000m: +1 degree; at 3000m: -6 degrees. Nighttime skies Friday night will initially be clear, but high-to-intermediate altitude cloudbanks will soon move in from the southwest. The zero-degree level will descend to about 1800m.

Avalanche danger levels are not expected to change significantly.