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Avalanche Forecast

Archived

Apr 16th, 2014–Apr 17th, 2014

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

Regions

Northwest Inland.

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

A warm front will bring precipitation to the north coast on Wednesday night and Thursday. Unsettled conditions are expected for Friday before the next system reaches the coast on Saturday.Wednesday Night: Precipitation: 5-10mm, freezing level: 1200m, ridgetop wind: light-moderate S-SWThursday: Precipitation 5-10mm, freezing level: 1400m, ridgetop wind: moderate S-SWThursday Night: Precipitation 3-5mm, freezing level: 900m, ridgetop wind: moderate SWFriday: A mix of sun and cloud, light scattered flurries possible, freezing level: 1100m, ridgetop wind: light SWSaturday: Precipitation 5-10mm, freezing level: 1300m, ridgetop wind: moderate-strong S-SW

Avalanche Summary

No new avalanches have been reported.

Snowpack Summary

New snow sits on a melt-freeze crust, old wind slabs leeward features, or dry snow in sheltered north facing terrain at higher elevations. Cornices are also large and potentially weak.The early February persistent weak layer is typically down 1.5 to 2m. Triggering of this layer has become unlikely but may still be possible with heavy triggers such as cornice falls or smaller avalanches stepping-down.

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.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.