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Avalanche Forecast

Archived

Nov 3rd, 2020–Nov 4th, 2020

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

Regions

Little Yoho.

Boom, here comes an avalanche cycle. A major storm crosses the area starting tonight, through Friday. Ice climbers: time to back-off the big gullies and overhead hazard. Skiers: wherever its deep enough to shred it will be wind loaded. Take it easy.

Weather Forecast

A warm, wet storm began to effect the region starting Tuesday afternoon and will deliver significant precipitation and wind until it passes and the air cools on Friday. Models show between 30-60 cm of storm snow by the end of Thursday with freezing levels at 2000 m throughout. WInds on Wednesday reaching 80 km/hr and even 100 km/hr on Thursday.

Snowpack Summary

Expect widespread windslabs in alpine areas, particulary in gullies or leeward features. These slabs will initially bond poorly to the early season snowpack and an avalanche cycle is anticipated for Wed and Thurs. Total snowpack depths on Tuesday range from 30-70 cm and we expect to see the snowpack double in the next 48 hours.

Avalanche Summary

No new avalanches observed or reported on Tuesday.

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.