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Avalanche Forecast

Archived

Apr 9th, 2022–Apr 10th, 2022

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

Weather Forecast

Saturday night: Mostly cloudy with isolated flurries, trace to 5 cm. Light west wind. Cold overnight temperatures, ridgetop low -10 C.

Sunday: Bands of convective moisture producing localized flurries up to 10 cm. Light northwest wind. Daytime freezing levels reaching 1200 m and ridgetop high -2 C.

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

Tuesday: Cloudy with isolated flurries. Moderate east wind. Ridgetop high -2 C.

Avalanche Summary

Rapid warming triggered several wet loose and wet slab avalanches to size 1.5 around the region Wednesday through Friday. 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 flurries 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.