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Avalanche Forecast

Archived

Dec 10th, 2018–Dec 11th, 2018

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

Regions

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Very dangerous avalanche conditions exist in the North Cascades. Natural and human triggered avalanches are likely. Travel below treeline remains difficult due to low snow. Avoid avalanche terrain at upper elevations as intense precipitation and strong winds continue.

Snowpack Discussion

Regional Synopsis coming soon.

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.