Avalanche Forecast

Issued: Nov 21st, 2016 4:20PM

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 swerner, Avalanche Canada

Given the very limited information on hand for this bulletin, I would tread cautiously and take the time to gather snowpack information as I go. Please submit any observations from your day to the MIN.

Summary

Confidence

-

Weather Forecast

Weather off the South Coast remains persistent with a solid southerly flow through tonight and tomorrow. Cooler air and strong southerly wind accompanies this low, keeping freezing levels lower than usually expected with these systems. By Tuesday night freezing levels will slightly rise to 1400 m then drop to 800 m or lower for the remainder of the week. The region will continue to receive light-moderate snow amounts.

Avalanche Summary

No recent avalanche activity has been reported. Touchy storm slabs may build at upper elevations, especially in the southern part of the region where more snow is expected through the forecast period.

Snowpack Summary

Snow depths are variable across the region with the snow line sitting around 1300-1400 m and below threshold for avalanche activity. Average snowpack depths at treeline are 60-100 cm with 150 cm plus in the alpine. Feathery surface hoar crystals up to 10 mm are reportedly wide spread around the Gold Bridge area and currently being buried under new snow. This layer may become reactive with additional load. I'm unsure if it exists south in the Duffy. At treeline elevations, 20 cm down exists a thick crust (20-30 cm) with a moist mid pack below. In the alpine this crust is down 50-65 cm. Reports suggest the new snow is sticking to the crust. When traveling in the mountains I’d maintain an investigative approach and dig down to test for weak layers before committing to a slope. If you've been in the mountains, please share your observations on our Mountain Information Network.

Problems

Storm Slabs

An icon showing Storm Slabs
Depending on your local snowfall amounts touchy storm slabs are possible at upper elevations, especially where buried surface hoar exists.
Use caution on open slopes and convex rolls at treeline where buried surface hoar may be preserved.Make observations and assess conditions continually as you travel.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Nov 22nd, 2016 2:00PM

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