Stub and Gleinalpe

New snow + storm winds. Heed fresh snowdrifts!

New snow + storm winds. Heed fresh snowdrifts!

New snow and storm-strength NW winds are increasing avalanche danger to Danger Level 3 (considerable) above the treeline. Freshly-generated snowdrifts are prone to triggering, medium-to-large sized avalanches can be triggered even by minimum additional loading, i.e. by the weight of one sole skier. Avalanche prone locations will increase with ascending altitude and over the course of the day, especially in E/SW aspects, in gullies and bowls and behind protruberances, depending on wind impact also in forest clearances. Poor visibility makes it more difficult to assess the danger on-site.

At high altitude, heavy snowfall deposited atop a frequently smooth, melt-freeze encrusted snowpack surface, initially with little wind impact. Bot the smooth surface and the persistent soft snowpack layers constitute an unfavorable base for the bonded snowdrifts. Moreover, during the course of the day the proneness to triggering will increase. In places, facted weak layers beneath the melt-freeze crust can be triggered. At lower altitudes the bonding of new snow to the often shallow snowpack is better, but even the drifts are prone to triggering in forest clearances.

A powerful cold front and a low over Genoa will bring winter conditions back on Wednesday. Right from the start, most summits will be shrouded in fog, from the northwest snowfall will begin. By evening: 15-30 cm is expected, more from place to place. Snowfall level will descend by evening from 1200-1500 m down to valley floors in many areas. Winds will be strong to stormy, shifting gradually to northwesterly. Temperatures will continually drop: at 2000 m from -1 in the morning to -9 in the evening. At 1500 m: from slightly above zero to -6 degrees. On Thursday in the Northern Alps and northern Niedere Tauern, initially clouds and minor snowfall. As of midday, improving weather conditions, dispersed clouds. On the southern flank of the Alps, mostly pleasant conditions, but cold and windy.

Hardly any change in avalanche danger, trigger-sensitive snowdrifts remain the main problem.