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Archived

Avalanche Forecast

Apr 12th, 2012–Apr 13th, 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
4: High
The avalanche danger rating below treeline will be high
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Banff Yoho Kootenay.

Rain in the lower elevations and snow above 2000 meters today and overnight tonight will some dangerous avalanche conditions. Wait for the freezing levels to drop and stay off isothermal slopes. JBW

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Freezing levels are uncertain on Saturday

Avalanche Problems

Wet Slabs

Rain saturated surface snow and a poor overnight freeze is creating highly unstable snow below 2000m. Widespread avalanches have been observed. This condition will improve when freezing levels drop to the surface on Saturday.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 4

Deep Persistent Slabs

New snow and melting has caused some deep slab releases to ground. Some of these are very large and likely not survivable if you were caught. Steep, unsupported and rocky areas with shallow snowpack should be avoided.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 4

Storm Slabs

New snow with the storm will be resting on a variety of old surfaces including crusts and facets. Careful route selection is advised until the new snow bonds and settles.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3