Avalanche Forecast

Issued: Nov 21st, 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.

Rising temps, increasing wind, and accumulations of up to 20cm expected late on Tues. Danger rating will start to rise. Pay attention to local/immediate conditions that are out of character with forecast ie. high danger earlier than expected.

Summary

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Intensity of incoming weather systems is uncertain on Wednesday

Problems

Persistent Slabs

The basal facets and depth hoar layer is between 30 and 50cm deep. Steep open features are to be treated with caution. This layer will be of particular concern when it is loaded with new snow starting Tuesday afternoon.

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

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 3

Wind Slabs

Currently, layer is only at high elevation lee aspects. However, as the storm tracks through the forecast region, it will become loaded and more sensitive to triggering. Also watch for local accumulations and developing storm slabs late on Tues.

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

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

1 - 2

Valid until: Nov 22nd, 2011 4:00PM