Avalanche Forecast

Issued: Apr 12th, 2013 10:35AM

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

Avalanche Canada mpeter, Avalanche Canada

Summary

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Saturday: Expect an unsettled day, with mostly cloudy skies and intermittent flurries. Accumulations up to 5cm are possible with upslope areas receiving brief, intense snowfalls yielding deeper localized deposits. Areas further inland (Coquihalla/Allison Pass) may see more intense precipitation.  Alpine temperatures should remain cool at around -6 with light westerly winds.Sunday: We should see a mix of sun and cloud, with a chance of isolated flurries. Alpine temperatures should reach around -8 with light northeasterly winds.Monday: Expect a continued clearing trend with scattered clouds, alpine temperatures reaching -6 and light northeasterly winds.

Avalanche Summary

Avalanche observations have been limited in the last few days; however, 2 explosives controlled size 2.5 slab avalanches were reported on Wednesday from the Duffey Lake area. They occurred on a north facing alpine slope and ran 1000-1400m.

Snowpack Summary

Up to 10cm of new snow has fallen at higher elevations. This overlies Wednesday's moderate to locally heavy amounts. At lower elevations rain continues to saturate the snowpack. The previous storm was accompanied by moderate to strong south/southwest winds which left variable snow distribution in exposed areas near ridgetop, with dense wind slabs forming in lee and cross-loaded features. Up to 75cm below the surface you will likely find a melt-freeze crust from last week's sunny weather. At the same interface, you may also find spotty surface hoar on some high, north facing slopes.Cornices are huge!

Problems

Storm Slabs

An icon showing Storm Slabs
New windslabs have formed in immediate lee locations at treeline and in the alpine, overlying previous wind deposits from the mid-week storm. In isolated terrain, storm snow avalanches may step down to a crust or surface hoar buried last week.
Be cautious as you transition into wind affected terrain.>Dig down to find and test weak layers before committing to a line.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 5

Cornices

An icon showing Cornices
Recent snow and wind has added mass to existing large and potentially destructive cornices.
Give cornices a wide berth when travelling on or below ridges.>

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

Elevations: Alpine.

Likelihood

Possible

Expected Size

1 - 6

Valid until: Apr 13th, 2013 2:00PM

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