Avalanche Forecast

Issued: Nov 24th, 2011 4:09PM

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

Brad White, Parks Canada

Banff Yoho Kootenay.

A widespread avalanche cycle has been caused by the recent storm overloading the basal depth hoar. Another storm Friday will keep the danger HIGH.

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Problems

Deep Persistent Slabs

A 40mm storm with strong winds has doubled to tripled the total season snowpack over the last 36 hrs. Natural and human triggered avalanches up to size three are occurring throughout the forecast area failing on the basal depth hoar.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Very Likely

Expected Size

2 - 3

Wind Slabs

Strong westerly winds with the storm have created thick soft to hard wind slabs in all open areas that are easily collapsing on the basal depth hoar and increasing the propagation width of the resulting avalanches.

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

Elevations: Alpine, Treeline.

Likelihood

Very Likely

Expected Size

2 - 3

Valid until: Nov 25th, 2011 4:00PM