Weisseck, Muhr Valley

Persistent weak layer and small snowdrifts

Persistent weak layer and small snowdrifts

Avalanche danger above 2300 m is MODERATE, below that altitude danger is LOW. Weak layers inside the old snowpack can on shady slopes above approximately 2300 m still can be easily triggered, particularly on wind-protected slopes at the foot of rock walls or behind abrupt discontinuties in the terrain. Avalanches can attain medium size. In addition, fresh snowdrift accumulations are prone to triggering, particularly on steep (>35°) N/E facing slopes above 2500 m. Danger zones occur behind abrupt discontinuities in the terrain, in gullies and bowls. Difficult to recognize danger zones, particularly in early morning. Caution wherever falls are possible. Isolated small glide-snow avalanches are possible on steep grassy slopes as well as small wet loose-snow avalanches, du to a thoroughly wet snowpack, sunshine and warmth. Reports from the relevant regions with regard to the persistent weak layer are few and far between currently (due to the snow situation); for that reason, these estimates are uncertain.

On high-alpine north-facing slopes the snowpack layering is unfavourable due to a sequence of melt-freeze crusts and faceted crystals in the fundament above 2300 m. This applies particularly to wind-protected slopes. By Tuesday there was 5-10 cm of fresh snow registered amid moderate to strong westerly winds. Small snowdrifts accumulated behind crests and in ridgeline gullies and bowls, particularly on shady slopes they lie atop a loose snowpack surface and can be triggered in places. Snow depths are below average. Below 1800 m there is little snow on the ground.

On Wednesday, heavy clouds will pass through, light conditions can become diffuse. These will move eastwards during the morning, sunny weather and good visibility will set in. Winds will remain weak. At 2000 m: -2 degrees; at 3000 m: -6 degrees.

Fresh snowdrift accumulations are consolidating. Little change expected.