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Archived

Avalanche Forecast

Nov 23rd, 2012–Nov 24th, 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
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
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: Glacier.

Weather Forecast

A pacific frontal system will move over the area today.  Cloudy moderate SW winds with moderate snow fall easing later today.  Unstable air in the wake of the front will result in snow showers with locally moderate winds this afternoon and overnight. 

Snowpack Summary

Now over 90mm of load on the Nov 6 crust, down 60-100cm.� Sudden planar and sudden collapse results have been reported above this layer recently. A cohesive storm slab has formed and is reactive where it overlies the Nov 16 sun crust.

Avalanche Summary

2 size 2 natural observed above the highway corridor yesterday one a result of a cornice fall in the alpine.  Loose point releases observed.  2 reports of skier accidental slab avalanches on steep wind loaded features in the alpine yesterday size 1.5

Confidence

Avalanche Problems

Wind Slabs

Riders triggered 2 wind slabs yesterday on steep southerly slopes in the alpine yesterday.  Suspect bed surface is a thin sun crust that was buried on November 16
Assess start zones carefully and use safe travel techniques.Avoid cross loaded features.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Persistent Slabs

Recent reports of whumphs, sudden collapse and sudden planar results on this layer.  Careful assessment of the bond with this layer and the slab above should be conducted before committing to any slope over 25 degrees.
Assess start zones carefully and use safe travel techniques.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3