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Avalanche Forecast

Archived

Dec 8th, 2021–Dec 9th, 2021

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

Regions

Glacier.

Strong winds and new snow formed fresh wind slabs. Expect loose dry avalanches in steep unsupported terrain.

Weather Forecast

Flurries for Wednesday evening with cooling temperatures and gusty winds from the SW. On Thursday the flurries continue with accumulations up to 5cm, continued cold temperatures, and strong winds. More of the same can be expected until Friday night into Saturday, when the next weather system is upon us, dropping another foot of new snow.

Snowpack Summary

Strong southerly winds and approximately 25cm of new snow at TL have built fresh soft slabs in exposed terrain features. The Dec 1st rain crust is roughly 20cm thick, buried approximately 40cm at 1300m, 60cm at TL, and has been reported to 2300m. The snowpack below the December 1st crust is strong, rounded, and still moist in places.

Avalanche Summary

Today in the Highway corridor we observed several avalanches up to size 3. The majority of the larger avalanches were in very steep terrain off of Mount Macdonald and Mount Tupper. No new reports from the backcountry as of 15:00 on Wednesday; however, it is definitely possible for skiers to trigger soft slabs and loose dry avalanches today.

Confidence

Due to the number of field observations

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.