Nock Mountains

Moderate snowdrift problem, persistent weak layer, wet-snow problem

Moderate snowdrift problem, persistent weak layer, wet-snow problem

Avalanche danger above 1500 m is MODERATE, below that altitude danger is LOW.

Three moderate problems prevail: (1) Snowdrift problem, near ridges small and thin drifts, can trigger small-to-medium avalanches in steep terrain, triggerable also by a fall. (2) Persistent weak layer: undetectable on the surface. Potential weak layers inside the snowpack can trigger most likely in transitions into wind-loaded zones (often where snow is shallow). All in all, only isolated spots where large additional loading, e.g. a fall, a group without distances, stomping, a small slab, can trigger a large slab. (3) Warmth problem: (wet-snow problem), which will cause numerous small loose-snow avalanches to release from the thin layer of fresh snow on steep slopes.

On Tuesday there was 10-15 cm of fresh snow, amid some W/NW wind at high altitudes. Small drifts were generated, thin, not extensive. Beneath the new snow are compact layers widespread which distribute their forces well. Inside the old snowpack, particularly on north-facing slopes are faceted weak layers which in places tend towards fracture propagation.

On Wednesday adequate visibility to start withm, some pale sunshine, then cloud cover will move inm, the peaks disappear in fog. Late afternoon the next round of precipitation will start, amid strong/stormy westerly winds. Snowfall level in the evening at 1500 m. Temperature at 2000 m: from -4 to 0 degrees. Storm winds on Thursday! Particularly at high altitudes, windspeeds over 100 km/hr can be reached, accompanied by instable weather conditions and variable visibility, with repeated showers. Snowfall level will initially lie at over 2000 m, towards evening descend to below 1500m. Snow and rain will be minor. Temperature at 2000 m: 2 degrees at midday, at 3000 m: -5 degrees.

On Wednesday night heavy storm winds and warm fresh snowfall or rain. Situation and conditions will change ongoingly. Danger level MODERATE (2) or CONSIDERABLE (3) (wet-snow and glide-snow problem at low altitudes, snowdrift problem higher up).