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Avalanche Forecast

Archived

Dec 25th, 2012–Dec 26th, 2012

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

Regions

South Coast.

Confidence

Fair

Weather Forecast

Wednesday: Light SW winds. Alpine temp -8. A few cm snow.Thursday/Friday: Light SW winds. Alpine temp -7. No precipitation on Thurs; light snow possible on Friday.

Avalanche Summary

A skier is reported to have triggered a size 2.5 slab on Saturday on a wind-loaded SW aspect at treeline in the Duffey lake area. Soft slabs and fast running loose dry avalanches were also failing naturally over the weekend. No avalanches were reported on Monday.

Snowpack Summary

New wind slabs have developed lee to both SE and down-valley winds. Apart from a couple of strengthening storm snow weaknesses, the snowpack is generally well-settled. Surface hoar layers in the upper/mid snowpack appear to be gaining strength but still exhibit hard, sudden results in snowpack tests. Near the base of the snowpack, a crust/facet layer appears to be inactive. Although unlikely, triggering an avalanche on this layer may be possible from thin snowpack areas or with a very heavy trigger.

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.