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Avalanche Forecast

Archived

Feb 25th, 2022–Feb 26th, 2022

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 may see a slight rise in hazard on Saturday afternoon due to solar inputs and the alpine temperature inversion. Keep this in mind if you are in confined terrain with slopes above you in the sun. Watch for wind slabs, and enjoy the sunshine!

Weather Forecast

The inversion will continue Friday night and into Saturday with warmer alpine temperatures of around -6 C, cooler treeline temperatures, and valley bottom temperatures as low as -18 C. Alpine winds will increase Saturday into the strong range out of the WNW which should keep things cool. Skies should remain clear.

Snowpack Summary

Extensive wind effect in the alpine and some treeline elevations. 20-40 cm of soft faceted recent storm snow in sheltered areas over the Feb 15 interface. The Jan 30th surface hoar/sun crust layer is down 35 to 70 cm and variable in distribution and reactivity, producing hard sudden planar to no results in snowpack tests.

Avalanche Summary

A remote cornice failure triggered a size 3 avalanche in Kootenay National Park on Wednesday. On Thursday, the local ski areas reported a few small wind slab avalanches up to size 1 with explosives control. No new natural avalanches observed or reported over the last couple days in the Little Yoho region.

Confidence

Intensity of incoming weather systems is uncertain on Sunday

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.