Archived

Avalanche Forecast

Nov 21st, 2011–Nov 22nd, 2011

Alpine

2: Moderate

The avalanche danger rating in the alpine will be moderate

Treeline

2: Moderate

The avalanche danger rating at treeline will be moderate

Below Treeline

1: Low

The avalanche danger rating below treeline will be low

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

1: Low

The avalanche danger rating below treeline will be low

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

2: Moderate

The avalanche danger rating below treeline will be moderate

Regions: 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.

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Intensity of incoming weather systems is uncertain on Wednesday

Avalanche 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