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Avalanche Forecast

Archived

Feb 8th, 2014–Feb 9th, 2014

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

Regions

Northwest Inland.

Confidence

Fair - Intensity of incoming weather systems is uncertain on Monday

Weather Forecast

Sunday: Mainly clear / Light northerly winds / Alpine temperatures at -18Monday: Light to moderate snowfall / Moderate to strong southwest winds / Freezing level at surfaceTuesday: Light to moderate snowfall / Moderate to strong southwest winds / Freezing level at surface

Avalanche Summary

No new avalanches were reported.

Snowpack Summary

A highly variable snowpack surface includes surface facets, surface hoar, thin wind slabs, and scoured crust, or any combination thereof. Remember to take stock of current surface conditions, especially crusts, surface hoar, and facets. Once buried buy a cohesive slab, surface hoar or a thin layer of facets sitting on a crust almost always becomes a weak layer for avalanches, and will often persist.In sheltered areas, large surface hoar is growing on a few centimeters of faceted old storm snow sitting on the late January crust, which is likely faceted and laminated and could have surface hoar on top. The entire snowpack is likely faceting to some degree, especially where it is shallow. Basal facets and depth hoar are likely, but triggering is only a concern in thin and variable snowpack areas with large triggers. Cornices are also becoming brittle.

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.