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Archived

Avalanche Forecast

Dec 8th, 2012–Dec 9th, 2012
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
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
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

Regions: Banff Yoho Kootenay.

Winds Monday with a warm storm may bump the danger rating.  JBW

Weather Forecast

A warm Pacific push will bring cloudy skies and some precipitation for Sunday. On Monday the cold arctic air will move over the region and temperatures will drop. Winds are forecasted to increase to strong from the west on Sunday.

Snowpack Summary

Generally a well settled snowpack with some resistant planar shears related to the recent storm snow in the upper 40 cm. The Nov. Rain crust is approximately 30- 40 cm off the ground and is showing variable results. Good coverage and strength for early December.

Avalanche Summary

No new avalanches observed. On a flight today over the Wapta and Vermilion, several large size 2.5-3 full depth releases were observed that were approximately 3-4 days old. We suspect these failed on the Nov. crust.

Confidence

Wind speed and direction is uncertain on Monday

Avalanche Problems

Wind Slabs

Soft to hard wind slabs can be found on lee and cross loaded slopes at and above treeline. Triggering is still possible on the right slope.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Deep Persistent Slabs

Isolated deep slabs have been noted every few days over the last month. Some of these have been explosive triggered and some natural, all failing near the ground on Nov 6 rain crust or glacial ice. There is still a concern for human triggering.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3