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Avalanche Forecast

Archived

Jan 22nd, 2014–Jan 23rd, 2014

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

Weather Forecast

The remains of a weakening trough will move through the area, bringing cloudy conditions with minimal snowfall. Alpine temperatures will hover near -2*C and ridge winds will be light from the N/NW. The ridge will rebuild after today, clearing the skies once again.

Snowpack Summary

A light dusting overnight freshened up the firm windslabs in the alpine and tree-line elevations. The mid-pack is well settled. The Nov surface hoar, down 180cm, has spotty distribution. The basal layers are more facetted and generally weaker than the rest of the snowpack. Expect a sun crust on steep south aspects and a rain crust below 1300m.

Avalanche Summary

No new avalanche activity yesterday.

Confidence

The weather pattern is stable

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.