Avalanche Forecast

Issued: Nov 26th, 2011 4:00PM

The alpine rating is high, the treeline rating is high, and the below treeline rating is high. Known problems include Deep Persistent Slabs and Storm Slabs.

Snow Safety, Parks Canada

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

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Intensity of incoming weather systems is uncertain on Sunday

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

Valid until: Nov 27th, 2011 4:00PM