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Avalanche Forecast

Archived

Feb 12th, 2014–Feb 13th, 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 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.

Regions

Northwest Inland.

Confidence

Fair - Intensity of incoming weather systems is uncertain on Thursday

Weather Forecast

Thursday: Light to locally moderate snowfall / Strong southwest winds / Freezing level at 700mFriday: Light snowfall / Strong southwest winds / Freezing level at 600mSaturday: Light snowfall / Moderate southwest winds / Freezing level at 500m

Avalanche Summary

No new avalanches were reported, although activity in neighboring regions suggests there was likely a round of storm slab activity to size 2 in response to recent wind and snow.

Snowpack Summary

Between 20 and 45cm 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 surface. Strong winds and slight warming have likely added cohesion to the new storm slab, and have shifted the new snow into deeper, reactive wind slabs in exposed terrain. 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.