Archived

Avalanche Forecast

Dec 26th, 2011–Dec 27th, 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

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

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

3: Considerable

The avalanche danger rating below treeline will be considerable

Regions: Banff Yoho Kootenay.

15-20cm fell at treeline and above in the last 24 hours, making for good tree skiing. An approaching weather system will mark a rise in avalanche danger starting on Wed. Amounts are uncertain, but it looks warm and wet. Stay tuned for updates. SH

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Intensity of incoming weather systems is uncertain on Wednesday

Avalanche Problems

Wind Slabs

Soft windslabs up to 30cm thick have formed in the immediate lees of ridgetops. These have been of low cohesion with not much significant mass. Expect moderate SW winds Tuesday in the alpine which will add thickness to these slabs.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Deep Persistent Slabs

Although we have seen less activity on this layer in the last week, light loads can still cause slides on the basal depth hoar/October rain crust. Steep, thin areas are the most prone to triggering. This is less prevalent in thicker snowpack areas.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3