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Avalanche Forecast

Archived

Feb 11th, 2014–Feb 12th, 2014

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

Weather Forecast

Wednesday: Moderate snowfall / Strong to extreme southwest winds / Freezing level at 500mThursday: Light to moderate snowfall / Strong southwest winds / Freezing level at 600mFriday: Moderate snowfall Thursday evening becoming light on Friday / Strong southwest winds / Freezing level at 500m

Avalanche Summary

No new avalanches were reported. I would expect touchy storm slab conditions with forecast weather over the next few days.

Snowpack Summary

Up to 20cm of new snow overlies a medley of old surfaces which include: weak surface facets, surface hoar, thin wind slabs, a scoured crust, or any combination thereof. Reports from the field indicate a poor bond between the new snow and these old surfaces. Strong winds are likely shifting the new snow into deeper, reactive wind slabs in exposed terrain. With more snow on the way, the reactivity and destructive potential of the developing storm slab should also increase. The mid snowpack is generally strong and well-settled. Basal facets and depth hoar are likely to exist in some areas, but triggering is only a concern in thin and variable snowpack areas with large triggers.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.