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Archived

Avalanche Forecast

Mar 18th, 2012–Mar 19th, 2012
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
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
2: Moderate
The avalanche danger rating at treeline will be moderate
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Banff Yoho Kootenay.

It is getting harder to trigger an avalanche on the Valentines surface hoar, but the consequence of triggering one is huge. Areas West of the Divide have more bridging strength overall. Watch for triggering from thinner areas.

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Due to the number and quality of field observations on Sunday

Avalanche Problems

Wind Slabs

Isolated wind slabs up to 50cm thick can be still triggered in steeper terrain, especially around ridge crests.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

Down 70-120cm, the Valentines surface hoar is producing harder shears, and Field teams in Yoho, the Wapta, and Kootenay today had similar results. A size 3 triggered by seracs in the bow hut area remote triggered moraines on this layer yesterday.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 2 - 3

Loose Wet

Numerous steep solar slopes were reported to slide today up to size 2.5 in the Emerald Lake area. Tomorrow we may see the same occurring. Failing cornices in the sun may provide a large trigger.

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

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 3