Avalanche Forecast

Issued: Dec 4th, 2016 3:51PM

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

Avalanche Canada shorton, Avalanche Canada

Heavy snowfall in the southern part of the region has increased the avalanche danger. Pay close attention to the amount of new snow in your riding area, and be prepared to back off to mellow terrain.

Summary

Confidence

-

Weather Forecast

MONDAY: Isolated flurries with possible accumulations up to 10 cm in the Coquihalla area and less in other areas, light south winds, alpine temperatures at -10.TUESDAY: Sunny, light north winds, alpine temperatures at -15. WEDNESDAY: Mix of sun and clouds, light north winds, alpine temperatures at -12.

Avalanche Summary

No recent avalanche observations have been submitted. Storm slabs may be very touchy in parts of the region that received the heaviest snowfall, such as the Coquihalla. In other parts of the region, storm slabs are most likely on wind loaded terrain features at higher elevations.

Snowpack Summary

On Saturday night, heavy snowfall brought up to 50 cm of new snow in the Coquihalla area, 25 cm around Manning Park, and 10 cm in the Duffey area. This new snow likely formed touchy storm slabs, especially on steep or wind loaded slopes. Below the recent storm snow you may find a layer of buried surface hoar which formed during last week's clear weather. This layer was reported to be well-developed in some parts of the Duffey area, although not much is know about its current size or distribution. Another layer of 3-5 mm surface hoar has been observed 60 cm below the surface in the Pemberton area and has produced easy snowpack test results. A thick crust can be found throughout the region in the mid-pack, down 70-100 cm at treeline elevations or deeper in the alpine. Although snowpack tests have shown the crust to be mainly unreactive, I'd expect increased reactivity with this layer in shallow, wind-affected alpine start zones.

Problems

Storm Slabs

An icon showing Storm Slabs
Storm slabs are very likely in the Coquihalla and other areas that received heavy snowfall on Saturday night. Strong winds blasted the alpine throughout the region, forming thicker storm slabs on wind-loaded features.
Be careful with wind loaded pockets, especially near ridge crests and roll-overs.Avoid steep, open slopes.Be alert to conditions that change with elevation.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Likely - Very Likely

Expected Size

1 - 3

Valid until: Dec 5th, 2016 2:00PM

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