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 2300 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. 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 north-facing slopes above 2300 m the snowpack layering is unfavourable due to a sequence of melt-freeze crusts and faceted crystals in the fundament, or else depth hoar. This applies particularly to wind-protected slopes. Winds from southerly directions are forming small snowdrift accumulations anew, behind abrupt discontinuities in the terrain and in ridgeline gullies and bowls, on shady slopes atop a loose snowpack surface where they can be triggered in places. Snow depths are below average. Below 1800 m there is little snow on the ground.

On Friday, visibility particularly in the Northern Alps will be reduced due to heavy cloud and light precipitation. The snowfall level lies at 1200 m. During the morning hours the cloud cover will disperse, visibility improve, the sun come out. During the day, brisk southerly winds will com up. At 2000 m: -1 to +4 degrees; at 3000 m, -6 degrees.

Little change expected.