Avalanche Forecast

Issued: Feb 6th, 2014 8:04AM

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

Avalanche Canada slemieux, Avalanche Canada

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Summary

Confidence

Fair - Wind effect is extremely variable

Weather Forecast

Tonight and Friday: The ridge bringing cold and dry conditions is still present but is weakening. Expect clear skies, light to moderate NE winds and temperatures around -14 C.Saturday and Sunday: Expect very similar conditions for Saturday with a bit more clouds on Sunday.

Avalanche Summary

There has been multiple skier triggered size 1 avalanches reported yesterday. These would have initiated in windslabs on lee features mostly in the alpine.

Snowpack Summary

Snow totals from a week ago ranged from 5-20 cm with the greatest accumulations in the south of the region. This snow is faceting quickly in the cold temps. In wind exposed terrain, especially in the alpine, winds continue to form shallow wind slabs that have recently been very easy to trigger by skiers. These variable wind slabs should stick around a bit longer than we're accustomed to as they are resting on a weak layer composed of large grained surface hoar (widespread in most sheltered and shaded areas at all elevations), a sun crust on open south facing slopes, faceted grains (in colder areas or areas with a thinner snowpack), or a combination of the above. Most of the snowpack is generally well consolidated. However, in thinner snowpack areas a facet/crust weakness and basal facets exist near or at the bottom of the snowpack. The depth of these layer makes human triggering unlikely, but the consequences of doing so could be disastrous.

Problems

Wind Slabs

An icon showing Wind Slabs
Winds have formed thin windslabs at and above treeline that rest on a variety of persistent weaknesses. These are sensitive to skier triggering.  In the Southern part of the region, this problem is more prominent.
Carefully consider the impact a thin wind slab will have on your proposed line, especially in high consequence terrain. Have a backup line in mind in case you need to seek more sheltered riding. >Highmark or enter your line well below ridge crests to avoid wind loaded pillows.>Be aware of the potential for full depth avalanches due to deeply buried weak layers.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 3

Valid until: Feb 7th, 2014 2:00PM

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