Archived

Avalanche Forecast

Nov 26th, 2011–Nov 27th, 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

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

3: Considerable

The avalanche danger rating at treeline will be considerable

Below Treeline

3: Considerable

The avalanche danger rating below treeline will be considerable

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

3: Considerable

The avalanche danger rating below treeline will be considerable

Regions: Banff Yoho Kootenay.

Strong to extreme Westerly winds and up to 30cm of snow Sunday are making for continued dangerous avalanche conditions. We expect a natural avalanche cycle tomorrow. Travel in any avalanche terrain is not advised. SH

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Intensity of incoming weather systems is uncertain on Sunday

Avalanche Problems

Deep Persistent Slabs

Windslabs 60-100cm thick sit over weak basal depth hoar. This was producing easy compression results at treeline today with the whole block collapsing. Natural avalanches to size 2.5 have been reported over the last 24 hours.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 2 - 3

Storm Slabs

With the forecast snow and wind Sunday, expect rapid formation of windslabs which should be enough to further increase the danger. These will be very susceptible to human triggering and will step down to the basal depth hoar.

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

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 2 - 3