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Avalanche Forecast

Archived

Feb 21st, 2020–Feb 22nd, 2020

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.

Regions

Little Yoho.

The wind slab problem has been added to tree line elevation due to consistent winds and forecasted snow amounts on Saturday.

Excellent skiing found in the sheltered areas.

Weather Forecast

Expect to see ~10cm of new snow throughout the day on Saturday. The strong winds will gradually decrease becoming light from the SW by the evening. Temps will drop, with an alpine high of -15. Sunday into Monday will see another 10-15cm of snow, light winds and slightly warmer temps.

Snowpack Summary

Continued snow transport and cornice growth today in the high alpine. Sun crust formation on steep solar facing terrain. Overall the deep snowpack (observed as 3m+ in some areas) is strong in Little Yoho with no significant shear test results.

Avalanche Summary

No new avalanche observations or reports on Friday. On Thursday wind slabs were observed up to size 1.5 today along the Icefields Parkway in loaded pockets in the alpine.

A size 2.5 skier remote was reported Wednesday on the scramblers route of Cascade Mountain on a steep SW slope in the alpine, no involvement.

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.