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Avalanche Forecast

Archived

Jan 26th, 2013–Jan 27th, 2013

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

Regions

South Coast.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Sunday: Northwest flows aloft will bring continued snowfall accumulations. Snow amounts 5-10 cm accompanied by moderate ridgetop winds from the West. Alpine temperatures near -6.0 and freezing levels at valley bottom. Monday: A low pressure system over Gulf of Alaska will move onto the north coast, sliding South bringing light precipitation. Snow amounts near 5cm with moderate NW ridgetop winds. Alpine temperatures near -6 and freezing levels at valley bottom. Tuesday: Light-Moderate snowfall amounts expected. Alpine temperatures near -3.0. Ridgetop winds  out of the NW in the light ranges.

Avalanche Summary

No new avalanche observations reported.

Snowpack Summary

Around 15 cm of snow overlies a variety of surfaces including hard old wind slabs, thin and thick crusts and large surface hoar crystals which can be found in sheltered terrain below treeline. In some areas, winds have transported the new snow and has built winds slabs in the lee of terrain features. A surface hoar layer buried down 40-80 cm seems to be gaining strength, but still exhibits moderate, sudden results in isolated snowpack tests. Near the base of the snowpack, a crust/facet layer exists, which is now unlikely to be triggered, except perhaps by heavy triggers in unsupported, shallow, rocky terrain where more faceting has taken place.

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.