Avalanche Forecast

Issued: Dec 27th, 2016 4:36PM

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

Avalanche Canada rbuhler, Avalanche Canada

Watch for signs of recent wind loading in exposed terrain. Wind slabs are expected to be reactive to human triggering on Wednesday.

Summary

Confidence

Moderate - Intensity of incoming weather systems is uncertain on Thursday

Weather Forecast

Lingering flurries are expected on Wednesday morning and sunny breaks are possible in the afternoon. Alpine wind is forecast to be moderate from the west to northwest direction and freezing levels are expected to reach around 800 m. The next storm front is forecast to arrive Wednesday overnight. 10-20cm of new snowfall is forecast by Thursday evening. Alpine wind is forecast to be strong from the southwest and freezing levels are forecast to remain around 800 m. Friday is currently forecast to be dry and sunny.

Avalanche Summary

No new avalanches have been reported from the region in several days. On Wednesday, wind slabs are expected to be the primary concern. Ongoing strong southerly winds are expected to be redistributing the 10-20 cm of new snow from Tuesday.

Snowpack Summary

10-20 cm of new snow has accumulated since Monday. This new snow sits over a variable interface which consists of wind affected surfaces, faceted (sugary) snow, or surface hoar. The surface hoar has been observed up to 5 mm in size in the Duffey Lake area. A thin sun crust may also exist in the upper snowpack and was reported around Coquihalla area over the weekend. Recently strong southerly winds have formed new wind slabs in leeward and cross loaded features in wind exposed terrain.  The mid and lower snowpack are generally expected to be well settled and stable.

Problems

Wind Slabs

An icon showing Wind Slabs
New wind slabs are expected to be reactive to human triggering on Wednesday. Ongoing strong southerly winds have been loading leeward and cross loaded terrain features in wind exposed terrain.
Use caution in lee areas. Recent wind loading has created wind slabs.Use ridges or ribs to avoid pockets of wind loaded snow.Avoid areas where the surface snow feels stiff or slabby.

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Dec 28th, 2016 2:00PM

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