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Archived

Avalanche Forecast

Nov 21st, 2012–Nov 22nd, 2012
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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

Regions: Glacier.

The winter permit system is not yet in effect but is scheduled to come into effect on Friday, November 23rd.  Click here to for information on how to obtain annual and daily winter permits.

Weather Forecast

Unstable convective snow showers today, possibility of rain below 1100m, moderate to strong SW winds at times.  Drier and cooler tomorrow, freezing levels lowering to surface. 

Snowpack Summary

Now over 80mm of load on the Nov 6 crust, down 60-80cm from the surface. Sudden planar results are being reported on this layer in the Asulkan Drainage recently. A storm slab is reactive where it overlies the Nov 16 sun crust which can be found in the upper snow pack on steep southerly aspects.

Avalanche Summary

Several new avalanche events to size 3 where observed yesterday above the highway corridor on running to 3/4 fan.

Confidence

Due to the number and quality of field observations

Avalanche Problems

Storm Slabs

The storm slab continues to evolve. Reports of shooting cracks and planar test results up the Asulkan at treeline recently indicate that rider triggering is possible on the right piece of terrain- a convex or unsupported slope.
Assess start zones carefully and use safe travel techniques.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Wind Slabs

Moderate to strong S-SW winds are redistributing available storm snow, forming windslabs on exposed lee slopes. 
Assess start zones carefully and use safe travel techniques.Avoid freshly wind loaded features.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3