Avalanche Forecast

Issued: Dec 16th, 2017 3:56PM

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

Avalanche Canada jsmith, Avalanche Canada

The forecast snow and wind on Sunday is expected to create fresh storm slabs reactive to human triggers. Use small slopes with low consequence to test the bond of the new snow.

Summary

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

SATURDAY NIGHT: 2-5cm snow / Strong westerly ridgetop winds / Freezing level valley bottomSUNDAY: 10-20cm snow / Strong westerly ridgetop winds / Freezing level valley bottom.MONDAY: Mix of sun and cloud / Moderate northwesterly ridgetop winds / Freezing level valley bottom. TUESDAY: Mix of sun and cloud / Light northerly ridgetop winds / Freezing level valley bottom.

Avalanche Summary

No new avalanches were reported within this region on Friday. Please submit your observations to the Mountain Information Network (MIN).

Snowpack Summary

The 5-10cm of new snow on Friday fell on a wide variety of surfaces including large surface hoar (weak, feather-like crystals), hard crusts formed by sun or wind, and sugary facets. There is not yet significant new snow load to create big problems, however, it will be important to monitor how the new snow is bonding to the smorgasbord of surfaces out there. When we receive significant new snow and it settles into a cohesive slab, (perhaps Sunday) you can bet there will be avalanches. I would be most concerned about areas that have surface hoar sitting on top of a hard crust. A major feature in the snowpack is a crust which was formed by rain in late November. It is down approximately 60-75cm at treeline elevations and snowpack tests suggest the snow is currently bonding well to it.Below treeline, the snowpack depth decreases rapidly. Look out for early season hazards such as rocks, stumps, and open creeks.

Problems

Storm Slabs

An icon showing Storm Slabs
Expect the new snow to become very reactive to human triggers once it settles into a cohesive slab.
Avoid slopes where the snow feels stiff or slabby.Watch for whumpfing, shooting cracks, or signs of recent natural avalanches.Use small slopes with low consequence to test the bond of the new snow.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Very Likely

Expected Size

1 - 2

Valid until: Dec 17th, 2017 2:00PM

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