Avalanche Forecast

Archived

Dec 11th, 2018–Dec 12th, 2018

Alpine

Natural and human triggered avalanches likely.

Treeline

Natural avalanches possible, human triggered probable.

Below Treeline

Natural avalanches possible, human triggered probable.

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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We have received significant snowfall, strong winds, and have a weak snowpack. This is a recipe for avalanches. It is not the time to travel in areas where avalanches can start, nor linger where they can run or stop.

Discussion

Avalanche Summary

Poor visibility and stormy weather has limited observations in the Paradise and Crystal areas. We have received reports of buried surface hoar and/or facets in sheltered areas of the Crystal backcountry. Even though we have limited information about the current snowpack and recent avalanches, what we do know is quite clear. We have received significant new snow, strong winds, and have a weak snowpack. Expect avalanches, especially at higher elevations.

Snowpack Discussion

Regional Synopsis coming soon.

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.