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Avalanche Forecast

Archived

Feb 20th, 2020–Feb 21st, 2020

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

Regions

Little Yoho.

We have phased out the deep persistent facets as a problem in this region due to the overall deeper snowpack and lack of recent deep avalanches. Watch for isolated thin areas where facets may be present. Excellent ski conditions overall.

Weather Forecast

Friday will be mainly cloudy with isolated flurries and periods of sun. The temperature inversion is forecasted to weaken with an alpine high of -9. The winds will remain moderate to strong from the SW. 5-10cm of snow is forecasted throughout the day on Saturday.

Snowpack Summary

Fresh wind slab development and continued cornice growth in the alpine. Sun crust formation on steep S and SW 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

Reports of wind slabs 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.