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Archived

Avalanche Forecast

Dec 10th, 2012–Dec 11th, 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
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: Jasper.

Weather Forecast

Continued moderate temperatures with light winds and little new snow is in the forecast.

Snowpack Summary

A wind event on Sunday brought moderate to strong NW winds. These winds moved a significant amount of snow and created a stiff surface slab condition. Expect variable wind loading patterns as directions vary with local terrain influences.

Avalanche Summary

Saturday three size 2-2.5 avalanches were noted now 48-72 hours old, 40 degree plus, NW aspect, cross loaded gullys. Explosive work on parkers slabs on Thursday with 22 avalauncher rounds produced one size 2 slab avalanche in a windloaded location on smooth steep rock slab. Expect current winds to  increase potential for natural avalanche activity.

Confidence

Due to the number and quality of field observations

Avalanche Problems

Wind Slabs

Sunday's winds created a stiff wind slabs on lee aspects particularly at high elevation ridge tops and specific features such as alpine gullies. Watch for reverse loading patterns and increasing natural activity.
Be careful with wind loaded pockets while approaching and climbing ice routes.Avoid lee and cross-loaded terrain near ridge crests.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3

Persistent Slabs

A persistent facetted weakness can be found around a mid-pack crust.
Avoid unsupported slopes.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3

Deep Persistent Slabs

This layer continues to develop in shallow snowpack areas which would be your likely trigger spots. Has potential to step down to ground if initiated.
Be aware of thin areas that may propogate to deeper instabilites.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3