Avalanche Forecast

Issued: Feb 18th, 2015 8:21AM

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

Avalanche Canada esharp, Avalanche Canada

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Summary

Confidence

Good - The weather pattern is stable

Weather Forecast

Conditions will remain dry and mild through the forecast period with what we call diurnal fluctuations in the freezing level (the spring-like pattern where the temperature can drop by up to 10 degrees overnight only to rise again through the day). Thursday will see mainly cloudy skies with light westerly winds and a freezing level rising from 1000 to 1800m. Dry conditions will continue into Friday although an increasing North to North East flow may bring isolated flurries overnight, the freezing level will reach a high of 1500m. This pattern continues into Saturday with up to 5 cm of dust on crust expected.

Avalanche Summary

No new avalanches have been reported recently

Snowpack Summary

A thick, solid crust can be found on the surface on all but highest alpine slopes. The best riding can be found in the North of the region right now where a thin dusting covers old wind pressed snow in the alpine.  This snow may have been moved around by the winds forming isolated thin wind slabs in lee features. Below 2200 to 2400m the crust is effectively capping the snowpack and protecting the buried persistent week layers we've been worried about for the last couple of weeks. The mid-January surface hoar is around 60 to 80cm down. The mid-December crust is becoming harder to find but where it does exist (mainly at treeline elevations) it is over a meter down. Although these layers are protected I think that a large trigger (like a cornice collapse) in the right place could still trigger a very large avalanche.

Problems

Wind Slabs

An icon showing Wind Slabs
Hard wind slabs may be lurking below ridge crests and in exposed gullies. These isolated pockets of stiff snow can fracture surprising distances above trigger points and into low-angled terrain catching people by surprise.
Be careful with wind loaded pockets, especially near ridge crests and roll-overs.>Be cautious as you transition into wind affected terrain.>

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

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

1 - 4

Persistent Slabs

An icon showing Persistent Slabs
Large avalanches are unlikely but possible in the high alpine where a large trigger in the right spot could cause an avalanche on a buried persistent week layer.
Be aware of the potential for very large, deep avalanches due to the presence of buried surface hoar or a facet/crust layer.>Be alert to conditions that change with elevation, the surface crust that is protecting deeper weak layers tapers out in the high alpine.>

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

2 - 5

Valid until: Feb 19th, 2015 2:00PM

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