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Archived

Avalanche Forecast

Dec 30th, 2021–Dec 31st, 2021
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: Jasper.

Building windslabs and irregular reactivity on deep instabilities is dampening our overall confidence in the snowpack, stay attentive to changes in slab consistency; underfoot, and in overhead terrain!

Weather Forecast

A little precip. and more reasonable winter temps expected into the weekend before we move back into another cold, high pressure.

Friday: Sunny with cloudy periods. Temp: High -21 C. Light ridge wind.

Saturday: Cloudy with sunny periods and isolated flurries. Trace of new. Low -29 C, High -21 C. Wind SW: 20 km/h. Alpine temperature inversion.

Snowpack Summary

Cold temps are penetrating deep into the upper snowpack, promoting widespread faceting. Pockets of wind slab are present on all aspects, tree line and above. The mid-pack is supportive with the Dec 1 interface down ~40 cm in most locations. Basal faceting continues below the Nov 5 crust potentially amplifying the deep persistent slab problem.

Avalanche Summary

Minimal natural activity observed on patrol. A large avalanche was seen mid-week in steep, shallow and rocky terrain. View min report here.

There has been inconsistence natural activity on the Nov 5 basal layer. When triggered, the slides are large and destructive. It's not yet open season, remain cautious and analytical when choosing your line.

Confidence

Avalanche Problems

Wind Slabs

Variable wind direction over the past week has caused reverse loading in some areas.

  • If triggered the wind slabs may step down to deeper layers resulting in large avalanches.
  • Variable winds have created pockets of wind slab on all aspects.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Deep Persistent Slabs

Recent avalanche observations have shown that deep persistent slabs can be initiated by large triggers such as surface avalanches or cornice failures.

  • Pay attention to overhead hazards like cornices which could trigger the deep persistent slab.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3