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Archived

Avalanche Forecast

Dec 29th, 2016–Dec 30th, 2016
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.

Ice climbing  conditions along the Parkway are great!Skiing, not so much.

Weather Forecast

Light snow overnight with moderate SW wind.  Seasonal  temperatures.  Clearing and colder temperatures expected later this weekend.

Snowpack Summary

Continued moderate SW winds building slabs in lee features and cross loaded gullies. Weak layers include; buried surface hoar (Dec 11) in sheltered NE aspects around treeline and the Nov 12 crust approximately 30cm from the ground. Generally, in the Alpine there is only snow in lee areas and the snowpack is faceted and weak. 

Avalanche Summary

Previous avalanche activity up to Sz 2 on N-NE-E slopes below ridgeline and to Sz 3 on a westerly aspect in steep, rocky, cross loaded terrain between 2400-2700m.  No new observations due to poor visibility.

Confidence

Due to the number of field observations on Friday

Avalanche Problems

Wind Slabs

Windslabs will vary in sensitivity to triggering.  Evaluate each slope carefully.
Watch for whumpfing, hollow sounds, and shooting cracks.Caution in lee and cross-loaded terrain near ridge crests.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Persistent Slabs

Recent large avalanches have been reported on this layer as snow load increases.
Be cautious in shallow snowpack areas where triggering is more likely.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3