Avalanche Forecast

Issued: Nov 20th, 2011 4:00PM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Persistent Slabs and Wind Slabs.

Aaron Beardmore, Parks Canada

Banff Yoho Kootenay.

The temperature will rise late on Tues with accompanying snowfall (~15-20cm @ TL), confidence fair. Wind will remain light from SW. Danger rating will increase to CON Weds morning. Note: Surface Hoar currently on surface in isolated areas: Alp + TL.

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Track of incoming weather systems is uncertain on Wednesday

Problems

Persistent Slabs

The basal facets and depth hoar layer is between 30 and 50cm deep. This layer produced whumphing in flat terrain near Sunshine Village today. Snow pack tests on this layer produced easy results. Steep open features are to be treated with caution.

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 3

Wind Slabs

Wind slabs between 20 and 40cm deep are lingering in leeward terrain in the alpine. Although forecasted to be small in size, wind-slabs that are triggered by riders or climbers will likely result in injury rather than burial.

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

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

1 - 2

Valid until: Nov 21st, 2011 4:00PM