Archived

Avalanche Forecast

Dec 27th, 2011–Dec 28th, 2011

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

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

2: Moderate

The avalanche danger rating below treeline will be moderate

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

Regions: Banff Yoho Kootenay.

Ten to 15 mm of precip is forecast for Wednesday and another 10 mm for Thursday night and Friday. This new snow in combination with forecast strong winds will increase the avalanche hazard.

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Avalanche Problems

Wind Slabs

The 20 cm of storm snow that fell on Christmas day has been redistributed by two days of mod to strong south and south west winds. Fresh wind slabs have been created in the alpine and open terrain at treeline.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Deep Persistent Slabs

The basal facets still linger at the bottom of the snowpack. Although we have not seen any recent avalanche activity on this layer be aware that this interface could become active with fresh snow loads.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3