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Avalanche Forecast

Archived

Apr 10th, 2022–Apr 11th, 2022

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Kootenay Boundary.

Check for pockets of wind slab around steep and high-consequence features.

Confidence

Moderate - Uncertainty is due to the speed, direction, or duration of the wind and its effect on the snowpack.

Weather Forecast

Sunday night: Blustery with isolated flurries ending early morning, trace to 5 cm. Light southwest wind. Ridgetop low -9 C.

Monday: Mostly cloudy with sunny breaks. Moderate and increasing east-northeast wind. Ridgetop high -2 C.

Tuesday: Mostly cloudy. Moderate east wind. Ridgetop high -5 C.

Wednesday: Mostly cloudy with sunny breaks. Moderate east wind. Ridgetop high -4 C.

Avalanche Summary

Wednesday through Friday, rapid warming triggered several wet loose and wet slab avalanches to size 1.5 around the region. The snowpack has since cooled and avalanche activity is unlikely, but re-frozen debris could be a real travel hazard.

Snowpack Summary

A dusting of up to 15 cm has covered a crust on all aspects and elevations. Wind has redistributed loose snow into gullies and depressions with pocket wind slabs below steep, open features.

Multiple crusts exist in the upper snowpack. The mid and lower snowpack are well settled.

Terrain and Travel

  • Watch for wind-loaded pockets especially around ridgecrest and in extreme terrain.
  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.

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.