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Archived

Avalanche Forecast

Mar 24th, 2012–Mar 25th, 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
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
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.

Avalanche control planned for Mts. Dennis, Hector, and Borgeau on Sunday. No climbing or skiing on these peaks. Avoid exposure to steep solar aspects tomorrow. SH

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

on Sunday

Avalanche Problems

Loose Wet

Freezing levels from 2300-2500m Sunday may initiate natural avalanche activity on solar aspects in the afternoon. Isolated activity on these aspects started late Sat. afternoon to size 2 in the Banff region.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Persistent Slabs

The Valentines surface hoar is 70-150cm down. Field tests on Hwy 93N found hard results on this layer at treeline, where it was buried 1 meter deep. Triggering will be most likely from thinner snowpack areas.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3

Deep Persistent Slabs

Although difficult to initiate, we have seen some activity on the basal depth hoar over the last few days. These were initiated from thin snowpack areas, or "step down" avalanches. A recent sz. 3.5 natural on Mt. Lefroy stepped down to this layer.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3