Avalanche Forecast

Issued: Dec 4th, 2013 8:12AM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Storm Slabs.

Avalanche Canada bcorrigan, Avalanche Canada

Be cautious on all wind exposed slopes at tree line and above

Summary

Confidence

Fair - Due to the number of field observations

Weather Forecast

Arctic air will dominate the region for the next few days,  Temperatures to -20c reported in the alpine at 2000 M. Freezing level at the surface in the valley bottoms.  Expect little change for the next week until the arctic high moves out of the area.

Avalanche Summary

No reports of new avalanche activity. This most likely reflects the low number of observations rather than actual conditions.

Snowpack Summary

Snowpack depths vary greatly across the South coast inland area. Whistler reporting 180 cm in the alpine and 80 cm at the toe of the glaciers. Coquihalla  received 70 to 80cm in the last storm event.  Winds from the SW during the storm shifted to N-NE with the arrival of the arctic outflow and have produced some wind slabs on lee slopes. Terrain below treeline is reported to be mostly below threshold for avalanche activity and solid.Moderate to locally heavy (in the south) accumulations now overlie a generally well settled snowpack. A few crusts with faceting  may be found near the base of the snowpack, especially at higher higher elevations. No observations of avalanches on these crust/facet layers have been reported up to this time, but they are worth keeping an eye on. Expect surface facetting with the cold temps, and surface hoar on N. slopes protected from the wind.

Problems

Storm Slabs

An icon showing Storm Slabs
Recent snowfall formed wind slabs on lee slopes during the storm on N and NE aspects. Arctic outflow wind following the storm has reverse loaded some features in the alpine and at tree line forming wind slabs on S and SW aspects.
The new snow will require several days to settle and stabilize.>Avoid lee and cross-loaded terrain near ridge crests.>Ensure everyone has essential avalanche gear and knows how to use it.>

Aspects: North, North East, East, South East, South, South West.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

2 - 3

Valid until: Dec 5th, 2013 2:00PM

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