Bulletin d’avalanche

Kootenay Boundary

Dec 3 – 4, 2011Avalanche Canada
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Archivé · expiré 15 years ago

Danger d’avalanche

Mon
Tue
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    Due to shifting winds, wind slabs may be found on all aspects. If a weakness exists lower in the snowpack, a wind slab release may step down deeper producing larger avalanches.

Confidence

Fair - Freezing levels are uncertain on Monday

Weather Forecast

A ridge of high pressure is expected to continue to provide drier and cooler temperatures to the interior on Sunday. The temperature should rise on Monday causing the freezing level to rise dramatically to near 3000 metres. Monday evening the ridge is expected to weaken, and light flurries are expected by Tuesday.

Avalanche Summary

No new avalanche activity has been reported. If you have any avalanche observations to report, please email us at: [email protected].

Snowpack Summary

A rain crust is now present below 1800m which may be a layer to watch as it get buried. The main concern in the upper part of the snowpack is wind slabs. Earlier in the week treeline and alpine winds were strong from the south-southwest. Winds have switched and are now blowing from the north-west. With Tuesday's new snow to transport, you can expect to find stiff wind slabs on many aspects, cross loading, and deeper stiffer pockets lee of terrain features. My guess is that the good riding with quality pow turns will be in sheltered locations that were unexposed to wind. Generally there is about 150-200cm in the alpine. Treeline depths are between 50 -150cms. Recent snow pack observations are indicating the late October rain crust is present in the alpine elevations and down approximately 120cm. This crust is said to be up to 5mm in thickness with predominate faceting below it. For the moment the crust seems to be bridging over the facets below, with a well settled midpack above.

Régions couvertes