Avalanche Forecast

Issued: Apr 12th, 2014 9:39AM

The alpine rating is considerable, the treeline rating is considerable, and the below treeline rating is considerable. Known problems include Storm Slabs, Deep Persistent Slabs and Loose Wet.

Avalanche Canada jlammers, Avalanche Canada

The timing of the this weekend's big warm-up is difficult to forecast. If Sunday ends up being the warmer day, Sunday's avalanche danger may be higher than posted.

Summary

Confidence

Fair - Timing or intensity of solar radiation is uncertain on Sunday

Weather Forecast

Sunday: Clear skies / Light and variable winds / Freezing level at about 2000mMonday: Clear with increased cloud late in the day / Light to moderate southwest winds / Freezing level at about 1500mTuesday: Overcast skies with very light precipitation / Light westerly winds / Freezing level at about 1300m

Avalanche Summary

In recent days numerous loose wet, and wet slab avalanches were reported up to size 2 from steeper start zones at treeline and below treeline. A widespread natural avalanche cycle up to size 4 occurred over the past 5 days and deep persistent weak layers became overloaded, initiating very-large avalanches. In shallower snowpack areas, storm slab avalanches have stepped down to the December facet/ depth hoar layer. Natural avalanche activity will likely continue through the weekend with sunny skies and a rapid rise in freezing levels.

Snowpack Summary

A recent storm has brought 90+ cm or more to coastal regions forming thick storm slabs on leeward features. Warmer temperatures have helped to settle the recent snow, although the storm snow may continue to be touchy where it overlies surface hoar, crusts and/or facets buried on April 2nd. At lower elevations the snowpack has been saturated by rain and may exist as wet snow or a refrozen crust. Large cornices have formed and loom over slopes below.The early February crust/facet layer is down 150 - 240 cm. This layer has become overloaded by recent storm loading and is failing in some places resulting in very-large avalanches.

Problems

Storm Slabs

An icon showing Storm Slabs
Snow and strong winds have built deep storm slabs at higher elevations. Warmer temperatures and solar radiation will likely de-stabilize the new snow and activate a natural avalanche cycle. Cornices may also fail with warming.
Minimize overhead exposure; avalanches triggered by warming or cornice fall may be large and destructive.>The new snow will require several days to settle and stabilize.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Likely

Expected Size

1 - 5

Deep Persistent Slabs

An icon showing Deep Persistent Slabs
Deep persistent avalanches would be very large and highly destructive. Possible triggers include cornice fall, a surface avalanche in motion, warming and intense solar radiation.
Minimize exposure to overhead avalanche terrain, large avalanches may reach run out zones.>There is potential for large, deep avalanches due to the presence of buried facets and surface hoar.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

3 - 7

Loose Wet

An icon showing Loose Wet
Watch for loose wet avalanches with daytime warming on steep, sun-exposed slopes. Loose wet avalanches can be pushy and entrain mass quickly.
Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.>Avoid sun exposed slopes when the solar radiation is strong, especially if snow is moist or wet.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Likely - Very Likely

Expected Size

1 - 4

Valid until: Apr 13th, 2014 2:00PM

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