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Avalanche Forecast

Archived

Nov 23rd, 2021–Nov 24th, 2021

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.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

Glacier.

Wind slabs have been reported to fail under the weight of skiers/riders in convex, unsupported terrain in the Alpine.

Travel in the thick forest continues to be harsh, with dust on a firm crust hiding near-surface rocks, stumps, and open creeks.

Weather Forecast

A benign Wed followed by a significant storm with rising temps on Thurs/Fri

Tonight: Mainly cloudy, Alpine low -14*C, light W ridge-top winds

Wed: Flurries, 5cm, Alpine high -9*C, mod SW ridge-top winds

Thurs: Snow, 25cm, Alpine high -4*C, strong SW winds

Fri: Snow, 15-20cm, Alpine high -3*C, mod SW winds

Snowpack Summary

40-45cm of snow has fallen over the last few days and has been redistributed by 25-40km/hr Southerly winds. At tree line the new snow covers the widespread November 15th crust. Mid-slope wind slabs have been reported in lee features in both the Connaught and Asulkan. Below ~1700m a breakable crust and refrozen snow/ice chunks make for poor travel.

Avalanche Summary

Several skier triggered avalanches, all wind slabs, were reported from Monday afternoon; one from the Pterodactyl, one from Nikki's Notch, and one from steep E-facing alpine terrain between Grizzly Mtn and Little Sifton. These were all mid-slope avalanches, down considerably from ridge-top.

No notable avalanches were observed in the highway corridor

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.