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Archived

Avalanche Forecast

Mar 11th, 2013–Mar 12th, 2013
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
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
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: Banff Yoho Kootenay.

Weather Forecast

A south-westerly storm is forecast to enter the area on Wednesday bringing moderate south-westerly winds, rising freezing levels (up to 2000 m on Wednesday) and significant snow (and rain at lower elevations). Forecast snow amounts vary but expect 20-40 cm along the divide by Friday.

Snowpack Summary

Approximately 30cm of settled storm from last week is bonding to the old surface. Localized winds have created spotty wind slabs in the alpine. East of the divide the mid-pack is supportive, but weak. West of the divide the mid-pack is well settled and much stronger.

Avalanche Summary

No avalanches observed or reported today.

Confidence

Intensity of incoming weather systems is uncertain on Wednesday

Avalanche Problems

Wind Slabs

Spotty wind slabs exist in the alpine up to 15 cm deep.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2

Storm Slabs

Storms slabs  (30-40cm thick) from last weeks storm persist in the alpine. Although the natural cycle has subsided these slabs still may be triggered by skiers in specific areas above treeline.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2