Avalanche Forecast

Issued: Dec 15th, 2016 3:37PM

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

Avalanche Canada swerner, Avalanche Canada

Forecast strong winds will elevate the avalanche danger through the weekend.

Summary

Confidence

Moderate - Due to the number of field observations

Weather Forecast

Mainly clear skies and cold temperatures, the coldest on Friday as low as minus 25 as the arctic hight continues to dominate the province. By the weekend the weather pattern will shift as the high moves to the southeast, allowing several weak Pacific frontal systems to make their way to the coast. A stronger system should hit the coastal regions by Sunday, moving into the Interior Monday bringing cloudy skies, snow and strong winds at upper elevations.

Avalanche Summary

On Wednesday, explosives control triggered a size 2 wind slab. With forecast strong winds over the weekend wind slab problems may increase and be triggered by light loads (skiers/ sledders). Loose dry sluffing from steeper terrain may push you off your line, so watch and avoid terrain traps below.

Snowpack Summary

Recent wind has formed wind slabs on a variety of aspects in the alpine. The cold temperatures and clear skies are developing facets near the surface. There may be a layer of surface hoar buried 20-30cm deep in sheltered areas. Alpine snow depths are around 120-170 cm, and the widespread mid-november crust is buried down around 70-90 cm. Snowpack and crust depths increase as you move west toward the Selkirk Range. It sounds like there is a bit less snow on the ground in the south of the region, but we have not had many observations at this time. If you dig down to the crust, watch for facets developing above and below. This may provide a hard surface with a weak sliding layer in the future.

Problems

Wind Slabs

An icon showing Wind Slabs
Wind slabs are reported to exist at treeline and in the alpine. Watch for conditions that change with aspect and elevation.
Be cautious of sluffing in steep terrain.Use ridges or ribs to avoid pockets of wind loaded snow.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Dec 16th, 2016 2:00PM

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