Avalanche Forecast

Issued: Dec 7th, 2013 7:33AM

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

Avalanche Canada Peter, Avalanche Canada

Keep an eye on temperatures on Sunday. We could see an above freezing layer develop, which could unlock the snowpack and increase the potential for rider triggering.

Summary

Confidence

Poor - Due to the number of field observations

Weather Forecast

Sunday: A mix of sun and cloud. Temperatures remain cold in the valley bottoms, but an above freezing layer could develop between 1200 and 1800 m. Winds should be moderate from the Northwest. Monday: Mainly cloudy with a chance of flurries. Freezing level remains at valley bottom and winds are moderate to strong from the Northwest. Tuesday: Mainly cloudy with a chance of flurries. Freezing level remains at valley bottom and winds are light to moderate from the W-NW.

Avalanche Summary

No recent avalanches have been reported, but reports are limited.

Snowpack Summary

Snowpack depths are highly variable across the region, with elevation, and in wind-exposed areas. Low-elevation and wind-affected areas have a shallow faceted snowpack. While in higher elevation sheltered areas the recent storm snow is settling and gaining strength; however, weaknesses at the old snow interface down approximately 40cm may still need time to heal. Recent reports suggest this interface is still giving easy compression test results and remains a concern with wind slabs. The lower snowpack is a series of crusts, some of which are laminated with facets, particularly in shallower areas. Facets under the uppermost crust, down approximately 50cm, gave hard sudden collapse compression test results in the Shames area on Sunday. Recent cold and clear weather is promoting surface hoar formation and near-surface faceting.

Problems

Wind Slabs

An icon showing Wind Slabs
Stubborn old wind or storm slabs could become more reactive on Sunday if an above freezing layer develops as forecast. Be especially cautious in exposed treeline terrain.
Avoid traveling in areas that have been reverse-loaded or cross-loaded by winds.>Use ridges or ribs to avoid pockets of wind loaded snow.>Avoid freshly wind loaded features.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 4

Valid until: Dec 8th, 2013 2:00PM