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Avalanche Forecast

Archived

Feb 13th, 2019–Feb 14th, 2019

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

Regions

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Dangerous and complex avalanche conditions exist throughout the region. We have high uncertainty regarding the current conditions in the West Central zone. Carefully evaluate the snowpack and use extra caution on steep unsupported slopes near and above treeline.

Discussion

Snow and Avalanche Discussion

The Mountain Loop area received more than three feet of snow over the weekend, and 2-3 feet of new snow since Monday. The recent snow has fallen at cold temperatures and may be poorly bonded to variable old snow surfaces including surface hoar, firm crusts, and low-density storm snow layers. The most recent snow has fallen with warmer temperatures making a “strong over weak” layering configuration. Avoid wind loaded terrain, especially near ridges.

In the neighboring Stevens Pass and Baker zones, persistent slab problems have developed. Observations from the West Central zone are limited, but we expect similar snowpack structure and buried weak layers may exist in this zone as well. Carefully evaluate the snowpack and choose conservative terrain during this time of elevated danger.

We have received a lot of snow over the past few days. These are the conditions when tree well and snow immersion suffocation accidents occur. Don't travel alone, and keep eyes on your partners. Check out https://www.deepsnowsafety.org/ for more information. 

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.