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Archived

Avalanche Forecast

Dec 11th, 2014–Dec 12th, 2014
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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Banff Yoho Kootenay.

Weather Forecast

Mainly cloudy with isolated flurries and freezing levels around 1700 m for Thursday night. Friday is mainly cloudy with a gradual cooling trend throughout the day. By Saturday freezing levels will be at valley bottom. Winds will switch from strong SW on Thursday night to light from the north on Saturday.

Snowpack Summary

Strong southwest winds have stripped  windward aspects and created fresh wind slabs in lee terrain at treeline and above locations. Mild temperatures have promoted settlement in upper pack, but lower basal layers remain weak and facetted.

Avalanche Summary

Evidence of a small cycle in Yoho Park at and below treeline due to Wednesdays warm temperatures and rain. A fresh slab in past 24 hours was observed on the east side of Mt. Victoria. (2900 m, size 2.5, 200m wide, approx 50 cm deep).

Confidence

Avalanche Problems

Wind Slabs

Strong southwest winds have stripped windward areas and created fresh wind slabs in  lee terrain at and above treeline. These windslabs are reactive to skier triggering.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Deep Persistent Slabs

Snowpack tests show that the weak facets at the base of the snowpack continue to be a concern.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3