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Archived

Avalanche Forecast

Jan 28th, 2013–Jan 29th, 2013
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
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

Regions: Glacier.

Watch for buried sun crust or surface hoar layers that could be triggered beneath this past weeks storm snow.

Weather Forecast

A weak upper trough will bring overcast skies with light precipitation today. Northwesterly low pressure system pushes against an arctic front bringing light to moderate amounts tomorrow with colder temperatures.

Snowpack Summary

10 cm of low density new snow.  Jan 23 layer is down 55cm. This layer is a sun crust on steep south and west aspects and surface hoar to 9mm below 1800m. The Nov 6 crust is down 200cm.

Avalanche Summary

1 natural slab size 2.0 in the highway corridor west of the Rogers Pass summit

Confidence

Intensity of incoming weather systems is uncertain on Tuesday

Avalanche Problems

Storm Slabs

Storm snow continues to settle into a more cohesive slab. 50cm sits on a sun crust on steep south and west aspects and over surface hoar below 1800m. Wind effect on north and east aspects may exist.
Dig down to find and test weak layers before committing to a line.Caution in lee and cross-loaded terrain near ridge crests.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2

Loose Dry

Up to 10 cm of light snow overnight will sluff easily in sufficiently steep slopes. Caution over terrain traps like cliffs and gullies.
Be cautious of sluffing in steep terrain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2