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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
1: Low
The avalanche danger rating at treeline will be low
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.

Watch for sluffing in confined gullies as the upper snowpack continues to lose cohesion.

It's still real cold, pack lots of warm gear and scale it back toward the end of the day.

Weather Forecast

Cold persists until the weekend.

Tonight: Cloudy periods, alpine low -22*C, light NW ridgetop winds

Fri: Mix of sun and cloud, alpine high-20*C, light NW winds

Sat: Cloudy with isolated flurries, low -20*C, high -10*C, moderate SW winds

Sun: Flurries, 6cm, low -13*C, high -11*C, moderate SW winds

Snowpack Summary

3-5 cm of new snow covers a cold, faceted upper snowpack, and small pockets of slab (5-30cm thick) - these can be found at all elevations, along ridge-crests, and in open features exposed to down-flowing winds. The Dec 1 crust is buried approx 70-120cm, with faceting of the snow directly above and below (especially in scoured, shallow areas).

Avalanche Summary

Isolated, random natural avalanche activity in the last 48hrs. One size 3 avalanche out of Tupper 2, a cornice fall sz 2.5 in the Kors-Thomas bowl (did not pull out a slab), and a couple of thin surface wind slabs from Crossover and MacD #11.

Human triggered avalanches are still possible, see MIN reports from 8812 Bowl and NRC Gully.

Confidence

Avalanche Problems

Wind Slabs

Moderate, variable winds have formed 5-30cm slabs on open features at all elevations, including reverse-loading on S and W aspects. If triggered, these slabs could possibly step down to the Dec 1 crust, approx 70-120cm deep.

  • Keep an eye out for reverse loading created by N-NE winds.
  • If triggered the wind slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2.5