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Archived

Avalanche Forecast

Nov 21st, 2012–Nov 22nd, 2012
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
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
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.

Weather Forecast

Heavy snow fall warning for Banff and Lake Louise tonight. Some forecasts say 10-15 at valley bottom locations. Can expect double this amount in the alpine. Temperatures will get colder towards the end of the week.

Snowpack Summary

30 cm of settled storm snow at tree-line along the continental divide along with moderate to strong westerly winds has created wind-slabs in the alpine. Easy shears at storm snow interface and mod shears down 60 cm on Nov 6 crust.

Avalanche Summary

  No natural avalanches were observed throughout the forecast area today. Several naturals were reported yesterday from the Icefields Parkway. Sunshine Ski Hill reported up to Class 2.5 slabs with explosives running in the storm snow.

Confidence

Intensity of incoming weather systems is uncertain on Wednesday

Avalanche Problems

Storm Slabs

Heavy snowfall forecasted for night of Nov 21. Expect 10-15 cm at valley bottom with double that amount in the alpine. This new snow will increase the avalanche hazard for Thursday.
The new snow will requires several days to settle and stabilize.Choose conservative lines and watch for clues of instability.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 2 - 3

Wind Slabs

Recent new snow and winds have produced wind slabs on lee aspects in the alpine. These slabs are reactive to skier triggering in specific locations.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3

Deep Persistent Slabs

Although no recent natural avalanches have been observed on this layer, this still is a significant interface to be aware of. Latest storm inputs may be enough to overload this layer.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3