Archived

Avalanche Forecast

Nov 25th, 2011–Nov 26th, 2011

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

4: High

The avalanche danger rating at treeline will be high

Below Treeline

4: High

The avalanche danger rating below treeline will be high

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

Regions: Banff Yoho Kootenay.

Unusually dangerous avalanche conditions exist. Another storm Saturday through Sunday may produce 30+ cm of snow with strong Westerly winds, further deteriorating conditions. Backcountry travel in avalanche terrain is not advised this weekend. SH

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

on Saturday

Avalanche Problems

Deep Persistent Slabs

Up to 45cm of snow deposited last Wed. formed wind slabs 60-100cm deep. This has overloaded the weak basal depth hoar and facets. Lake Louise and Sunshine ski areas reported widespread activity up to 2.5 today from explosive control, some 200m wide.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 2 - 3

Wind Slabs

As new snow accumulates this weekend, expect rapid wind slab formation, which will continue to overload the basal facets, increasing natural activity and the potential for human triggered avalanches.

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

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 2 - 3