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Avalanche Forecast

Archived

Dec 31st, 2021–Jan 1st, 2022

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

Regions

Glacier.

The hazard will increase through the weekend, as wind, warm temps and new snow gradually load up starting zones.

Weather Forecast

Out with the cold for the New Year, as a low pressure system passing North pushes wind and snow our way.

Tonight: Cloudy periods, alpine low -21*C, light West ridgetop winds

Sat: Cloudy with isolated flurries, high -13*C, strong SW winds

Sun: Flurries, 8cm, low -14*C, high -12*C, moderate SW wind

Mon: Flurries, 7cm, low -13*C, high -10*C, light S wind

Snowpack Summary

Plenty of snow available for wind transport. The upper snowpack is cold and facetted, with small pockets of windslab (5-30cm thick) - these are at all elevations, along ridge-crests, and in open features exposed to down-flowing winds. The Dec 1 crust is buried 70-120cm, with faceting of the snow above and below (especially in shallow areas).

Avalanche Summary

Tree bombs triggered a few small loose dry avalanches, and one size 2.0 windslab on solar aspedts Friday.

A cornice fall triggered a small (size 1.5) windslab on Connaught on Thursday, and in the highway corridor a large (size 2.0) windslab slid on the S face of Tupper.

Confidence

Intensity of incoming weather systems is uncertain

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.