Bulletin d’avalanche

Kootenay Boundary

Dec 13 – 14, 2016Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

Wed
Thu
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Fresh and touchy wind slabs are lurking in unusual places. Use caution as you transition into exposed terrain.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Fresh wind slabs on the downwind side of ridge crests and terrain features are highly sensitive to human triggers. Expect to find these deep pillows of wind-transported snow in unusual places thanks to recent northerly winds.

Confidence

Moderate - Wind effect is extremely variable

Weather Forecast

Expect continued cold and dry conditions for Wednesday, Thursday and Friday with the chance of some cloud Thursday and Friday. Winds should remain light and variable for Wednesday and Thursday, but pick up to moderate northerlies again on Friday. Alpine temperatures are expected to remain in the -15 to -20 range with a weak inversion on Wednesday, but significant cooling for Friday.

Avalanche Summary

Reports from Monday include sensitive ridgetop wind slabs with numerous Size 1's with ski cuts. Elsewhere, explosives control produced limited results with a few Size 2 slabs that likely ran on the late November rain crust. On Sunday, numerous natural and skier triggered size 1-1.5 storm slab avalanches were reported on all aspects near Kootenay Pass. If the winds pick up to moderate, expect to find fresh wind slabs in lee features below ridgetops.

Snowpack Summary

Around 15-25cm of fresh snow recently buried the weak surface hoar and surface facets that formed last week. The new snow is expected to bond poorly to the old interface on it has settled into a cohesive slab, but is reported to be low density and appears to only be a concern in wind loaded features at the moment. The lower snowpack is settled and strong. A widespread crust that was buried in November is typically down 80-100cm. Recent tests show the layer is unreactive but cold temperatures have promoted facet growth around the crust and this layer could become a problem in the future.

Régions couvertes