Avalanche Forecast

Issued: Apr 4th, 2013 9:38AM

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

Avalanche Canada pmarshall, Avalanche Canada

Summary

Confidence

Fair - Due to limited field observations

Weather Forecast

Synopsis: A series of frontal systems will move through the province over the next few days bringing cloud and light snow to the Northwest. Friday: Light snow – 5-10 cm. The freezing level is around 800-1000 m and winds are moderate from the south-southeast. Saturday: Light snow continues. The freezing level remains around 1000 m. Winds are moderate from the south. Sunday: A mix of sun and cloud with a chance of flurries. Temperatures are pretty steady with daytime freezing levels around 1000-1200 m.

Avalanche Summary

Solar induced avalanche activity tapered off over the past couple days as temperatures cooled slightly. Previous activity included loose wet sluffs up to size 2 on steep sun-exposed slopes. Cornices and glide cracks continue to fail with some regularity.

Snowpack Summary

Light new snow will bury a variety or old snow surfaces including a melt-freeze crust, moist snow, sugary facets, and wind affected snow. Pockets of wind slab could develop in exposed lee terrain over the next several days. 30 - 60 cm of snow overlies a crust, old wind slabs or surface hoar layer buried on March 9th. The distribution of the surface hoar is also highly variable and it does not exist in every drainage. I would still remain cautious and continue to dig and test before diving into my line. Deeper in the snowpack, basal facets may resurface as a concern with continued mild temperatures.Cornices have become well-developed and could easily become unstable during periods of warm weather or direct solar radiation.

Problems

Wind Slabs

An icon showing Wind Slabs
Thin new wind slabs could form in exposed lee terrain and cross-loaded features. Triggering may be possible in steep terrain.
Use ridges or ribs to avoid pockets of wind loaded snow.>Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.>

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Cornices

An icon showing Cornices
Give cornices a wide berth when travelling on or below ridges.>

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

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

1 - 6

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

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