Avalanche Forecast

Issued: Mar 15th, 2018 4:34PM

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 2-8 cm. Ridge wind light, north. Alpine Temperature near -5. Freezing level 1000 m.FRIDAY: Cloudy, light flurries. Accumulation 2-4 cm. Ridge wind light, southwest. Alpine Temperature near -5. Freezing level 1500 m.SATURDAY: Mostly cloudy. Ridge wind light, northeast. Alpine Temperature near -4. Freezing level 1500 m.SUNDAY: Mostly cloudy. Ridge wind light, northwest. Alpine Temperature near -5. Freezing level 1500 m.

Avalanche Summary

Wednesday there were reports of several natural, loose, wet avalanches up to size 1.5 on south aspects at all elevations, as well as a skier triggered wind slab (size 1) on a northeast aspect at 2300 m.On Tuesday there were two size 1.5 skier triggered wind slab avalanches reported on north and northwest aspects in the alpine. Reports from the past several days primarily included wet loose avalanches to size 2 in steeper terrain on sunny aspects.

Snowpack Summary

The main story has been the sun's effect on south and west facing slopes over the past several days. Daytime heating has resulted in moist or wet snow on sunny aspects and then freezing to form a crust overnight. High elevation northerly aspects still hold dry snow. Persistent weak layers from early January and mid-December are still being reported by local operators. They are generally considered dormant, but could wake up with a surface avalanche stepping down, a 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 oversMinimize 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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