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Archived

Avalanche Forecast

Nov 19th, 2011–Nov 20th, 2011
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
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.

Another cold day ahead, followed by a warming trend and little to no snow in the immediate forecast.

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Avalanche Problems

Persistent Slabs

Steep open slopes at and above treeline have a soft to hard wind slab that is sensitive to human triggering near the ground on the basal depth hoar. Wind loading triggered Na avalanches up to size 2.5 that failed to ground in the last 48 hrs.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3

Wind Slabs

All slopes that look inviting for skiing have a wind slab over depth hoar layering. Cracking, whumphing, natural and skier triggered avalanches have been observed. This layer collapses with Easy results. Pick lower angled low consequence terrain.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3

Wind Slabs

Several, 2 day old, downed avalanches observed on the Hwy 93 N failed in the midpack (photos on the ACMG mountain conditions report), beneath cliffs or on convex rolls. We are uncertain of the failing layer, but it could be preserved surface hoar.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 2 - 3