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Archived

Avalanche Forecast

Feb 28th, 2012–Feb 29th, 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
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

Regions: Banff Yoho Kootenay.

A lot of settlement in the snowpack was heard and felt today on a ski tour in Kootenay. This kept us on well-supported, low consequence terrain. With small amounts of snow in the next few days, the tip-toeing around convex slopes will continue.

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Avalanche Problems

Persistent Slabs

Stability tests on the Valentine layer in Kootenay today showed easy results, sudden planar, down 40-50cm. This is enough snow to create a large avalanche. This layer ranges from 20cm depth near Bow Summit, to 60cm near Sunshine and Yoho.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 2 - 3

Wind Slabs

Moderate winds in the past few days 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. Several natural slides were observed off Mt Bosworth today.

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

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Deep Persistent Slabs

Near Bow Summit yesterday, we encountered moderate, sudden collapse shears on basal depth hoar. Steep, thin areas mainly E. of the divide will be prone. Lake Louise reported recent, isolated slides triggered on surface hoar which stepped to ground.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2