Avalanche Forecast

Issued: Dec 10th, 2011 8:56AM

The alpine rating is low, the treeline rating is low, and the below treeline rating is low. Known problems include Deep Persistent Slabs.

Avalanche Canada jlammers, Avalanche Canada

Summary

Confidence

Fair - Intensity of incoming weather is uncertain on Tuesday

Weather Forecast

Sunday's forecast calls for mostly sunny skies and light northerly winds.On monday expect increasing cloud in the afternoon, trace amounts of precipitation and moderate westerly winds.On tuesday moderate snowfall will occur throughout the day with moderate to strong southwest winds.Freezing levels are expected to sit at valley bottom throughout the forecast period.

Avalanche Summary

There have been no recent avalanches reported.

Snowpack Summary

At the base of the snowpack mixed forms (rounding facets/rounding depth hoar) with an associated crust are prevalent, and have been especially problematic where it is overlying summer firn. Above that, and down 1-2m, are two more crusts combined with more mixed forms and surface hoar. The overlying snow has recently settled and stiffened and the weak interfaces have also gained strength. The snow surface is wind hammered in wind-exposed areas, crusty on sun-exposed slopes, and faceted powder with large surface hoar on shady sheltered slopes. A thick rain crust is down 20-40cm and extends up to treeline elevations.

Problems

Deep Persistent Slabs

An icon showing Deep Persistent Slabs
The likelihood of triggering a large avalanche is low, but it still makes sense to keep the deep weaknesses on your radar. The greatest concern is on steep, unsupported slopes with variable snowpack depths above 1900m.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Unlikely

Expected Size

2 - 5

Valid until: Dec 11th, 2011 8:00AM

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