Avalanche Forecast

Issued: Dec 24th, 2017 3:40PM

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

Avalanche Canada shorton, Avalanche Canada

Sheltered terrain not only offers the best riding right now, but also keeps you away from lingering wind slabs.

Summary

Confidence

High - The weather pattern is stable

Weather Forecast

MONDAY: Sunny, moderate northwest winds, treeline temperatures around -12 C.TUESDAY: Sunny, moderate northwest winds, treeline temperatures around -14 C.WEDNESDAY: Mix of sun and cloud, moderate southwest winds, treeline temperatures around -18 C.

Avalanche Summary

A few small wind slabs in steep south facing terrain were reported west of Smithers in a Mountain Information Network report (see here). Wind slabs have shown some reactivity to human triggers over the past week, but cold temperatures have generally 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 the western parts of the region near coastal inlets. Sheltered areas may still have 10-30 cm of powder from previous storms. Roughly 20 cm below the surface, a variable weak layer exists comprising of facets, crusts on solar aspects, and in protected areas below 1500 m, feathery surface hoar. In most places, insufficient snow has fallen above this layer for it to be reactive, but it should be considered in deep snow areas or where the wind has blown additional snow over the top of it. 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.

Problems

Wind Slabs

An icon showing Wind Slabs
Winds slabs may be found on a range of aspects in alpine terrain as winds have shifted throughout the week.
Evaluate unsupported slopes critically.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.Use ridges or ribs to avoid pockets of wind loaded snow.

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

1 - 2

Valid until: Dec 25th, 2017 2:00PM

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