Avalanche Forecast

Issued: Dec 29th, 2017 3:46PM

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

Avalanche Canada jmcbride, Avalanche Canada

Cold, dry conditions are expected to continue for the weekend. Pockets of lingering wind slabs may still exist in exposed alpine areas. New snow and wind on Monday will heighten avalanche danger.

Summary

Confidence

Moderate - Due to the number of field observations

Weather Forecast

SATURDAY: Mostly sunny. Ridge wind light southwest. Temperature -20. Freezing level surface.SUNDAY: Increasing cloud. Ridge wind light west. Temperature -20. Freezing level surface.MONDAY: Cloudy, flurries. Accumulation up to 5 cm. Ridge wind moderate southwest. Temperature -15. Freezing level surface.

Avalanche Summary

A few small natural wind slabs were reported last weekend in steep south facing terrain west of Smithers. Wind slabs showed some reactivity to human triggers a week ago, but cold temperatures have likely made them difficult to trigger.

Snowpack Summary

Surface snow has been affected by winds from a variety of directions. The degree of wind effect varies throughout the region, with the most dramatic winds associated with outflow conditions in western parts of the region near coastal inlets. Sheltered areas may still have 10-30 cm of powder from previous storms. A variable weak layer that formed in mid-December can be found roughly 20 cm below the surface. This mid-December layer is comprised of crusts on solar aspects and feathery surface hoar in sheltered locations.The lower snowpack is generally well settled with two prominent crusts. The late-November crust can be found 30-50 cm below the surface and the October crust is near the base of the snowpack.For an update on recent conditions check out the Mountain Information Network (MIN) report here. And please submit your own observations to the MIN!

Problems

Wind Slabs

An icon showing Wind Slabs
Lingering pockets of wind slab may exist on a range of aspects in alpine terrain as wind directions have varied over the past week.
Watch for stiff or hollow feeling snow, and shooting cracks.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Unlikely

Expected Size

1 - 2

Valid until: Dec 30th, 2017 2:00PM

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