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Avalanche Forecast

Archived

Dec 30th, 2021–Dec 31st, 2021

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

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

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.