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Avalanche Forecast

Archived

Feb 19th, 2020–Feb 20th, 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.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
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

A temperature inversion (warmer in the alpine, cooler in the valley bottoms) will start to break down Thursday with some increased winds in the alpine. Temperatures will be -7 in the alpine midday with no snow forecast in the next 24 hours.

Snowpack Summary

Continued settlement is slowly stabilizing any recently formed windslabs, which can still be triggered in steep, loaded areas in the alpine. Some 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

No new avalanches were observed or reported Wednesday. Some very large cornice failures were observed on Wapta Peak Wednesday which did entrain all of the snow below from cliffs, but did not trigger the slopes below.

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.