Avalanche Forecast

Issued: Jan 8th, 2013 9:54AM

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

Avalanche Canada ccampbell, Avalanche Canada

Summary

Confidence

Good

Weather Forecast

Wednesday: Snow flurries with another 5-10cm possible, moderate southwesterly winds becoming northwesterlies in the afternoon, and freezing levels are expected to rise as high as 1500m on Tuesday night but drop back down to 700m by midday Wednesday. Thursday and Friday: Mainly sunny and dry with light northerly winds and freezing levels near sea level.

Avalanche Summary

Relatively small soft slab and dry loose avalanches were easily triggered on on Tuesday, but with further loading by new snow, the potential for larger, more destructive storm slab avalanches is expected to increase. At lower elevations near the coast widespread natural moist loose avalanches up to Size 2 were also reported.

Snowpack Summary

20-30cm of storm snow since Friday is bonding poorly to the previous snow surface, which includes large surface hoar, facets, old hard wind slabs, or a sun crust. As more snow continues to load this weakness, and the slab settles and becomes cohesive, it is expected to become even more touchy with the potential for larger avalanches. No significant weaknesses have been reported recently below this in the mid snowpack layers. Near the base of the snowpack, a crust/facet layer exists, which is now unlikely to be triggered, except perhaps by heavy triggers in steep, shallow, rocky terrain where more facetting has taken place.

Problems

Storm Slabs

An icon showing Storm Slabs
The new snow has set up touchy slab conditions in many areas, especially where strong southerly winds have created thicker and denser deposits.
Be cautious as you transition into wind affected terrain.>The new snow will require several days to settle and stabilize.>Avoid open slopes and convex rolls at and below treeline where buried surface hoar may be preserved.>Choose conservative lines and watch for clues of instability.>

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Very Likely

Expected Size

1 - 5

Valid until: Jan 9th, 2013 2:00PM

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