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Archived

Avalanche Forecast

Feb 29th, 2012–Mar 1st, 2012
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Little Yoho.

A number of skier-triggered avalanches in the past few days shows people want to attack the slopes. This is NOT the time to ski your big line, but instead, show some restraint and give the weaknesses time to heal. It may be a while...

Avalanche Problems

Persistent Slabs

Snow depths over the Valentines surface hoar and suncrust on steep solar aspects range from 20cm E of the Divide, to over 45cm at Sunshine and Yoho. Where the wind has stiffened these slabs, skiers have triggered big enough slides to bury them.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 2 - 3

Wind Slabs

Moderate winds this week have also created thin, but stiffer wind slab conditions 25-35 cm deep on ridgetop lee terrain. These have been seen to step down to the Valentine layer. Skiers on Fairview triggered a large slide yesterday, lucky to survive.

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

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Deep Persistent Slabs

In the Lake Louise backcountry today, we encountered a weak, shallow snowpack. Tests done here showed hard results, but sudden collapse, on the basal facets. The slides reported yesterday on Bosworth and Fairview both had stepped down to ground.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2