Avalanche Forecast

Issued: Mar 15th, 2018 4:35PM

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

Avalanche Canada jmcbride, Avalanche Canada

Pockets of lingering wind slabs can still be found on high northerly aspects where the snow has remained dry and cold.

Summary

Confidence

High -

Weather Forecast

TONIGHT: Flurries. Accumulation 3-8 cm. Ridge wind light, northwest. Alpine Temperature near -5. Freezing level 800 m.FRIDAY: Cloudy, light flurries. Accumulation up to 2 cm. Ridge wind light, southwest. Alpine Temperature near -5. Freezing level 1600 m.SATURDAY: Mostly cloudy. Ridge wind light, northeast. Alpine Temperature near -6. Freezing level 1500 m.SUNDAY: Mostly cloudy, light flurries. Accumulation 2-4 cm. Ridge wind light, northwest. Alpine Temperature near -5. Freezing level 1500 m.

Avalanche Summary

A natural avalanche cycle to size 3.5 occurred over past several days. These avalanches were primarily wet loose avalanches on sunny aspects; however, some slab releases did step down to deeper weak layers (with 50-70 cm crowns) on west and southerly aspects. Wednesday there was a report of a skier triggered size 1 wind slab on a north aspect at 2000 m.On Tuesday there were few reports of skier triggered wind slab avalanches to size 1.5 on northerly aspects in the alpine. There was also a report of natural size 3 cornice failure on a northwest aspect in the alpine that triggered the most recent storm snow.

Snowpack Summary

A light dusting of new snow now covers a crust on all but high elevation north and east facing slopes where cold, dry snow sits above a well settled snowpack. Deeper persistent weak layers from January and December are generally considered dormant, but could wake up with a surface avalanche stepping down, cornice fall, or a human trigger in a shallow or variable-depth snowpack area. These layers consist of sun crust, surface hoar and/or facets.

Problems

Wind Slabs

An icon showing Wind Slabs
Pockets of reactive wind slab can still be found in leeward areas at upper elevations.
Watch for wind loaded pockets near ridge crests and roll-overs.Minimize exposure to overhead hazard from cornices, which may become weak with daytime heating.

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

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

1 - 2

Valid until: Mar 16th, 2018 2:00PM

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