Bulletin d’avalanche

Kootenay Boundary

Mar 29 – 30, 2015Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Tue
Wed
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Warmth is the main driver of avalanche hazard at the moment. Minimize your exposure to large slopes if the snowpack is becoming moist or wet.

Problèmes avalancheux

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–3
    New snow that fell over the weekend will be subject to very warm temps and direct solar Monday which will likely drive a widespread loose wet avalanche cycle. Large visor like cornices that overhang many ridge-tops will also be prone to failure.

  • Wet Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–5
    As the snowpack is subjected to significant warmth, the bond that fresh wind slabs and storm slabs have with the underlying saturated snow and deeper crust could rapidly decay. Potentially large wet slabs are possible Monday.

Confidence

Fair

Weather Forecast

Monday: Freezing level starting around 2300m, rising to 2600m by the afternoon. Very light South/Southwest winds at treeline, moderate SW winds at ridgetop. Spring pattern, scattered cloud cover giving way to clearing skies in the afternoon. No significant precipitation expected.Tuesday: Broken skies. Freezing level starting around 2100m, dropping to 1500m by days end. 1 to 5mm of precipitation expected, 1 to 7cm of snow possible. Treeline winds moderate SW/W, ridgetop winds strong SW/W.Wednesday: Scattered cloud cover. Freezing level starting at 1300m, rising to 1800m in the afternoon. No significant precipitation. Light W winds at treeline, moderate NW winds at ridgetop.

Avalanche Summary

No new avalanche activity reported from Saturday. A wide variety of avalanches were observed Friday: Loose wet avalanches to size 2 on all aspects between 1600m and 2200m, a size 2 wet slab on a E/SE facing feature at 2200m and even a rider triggered storm slab on an E facing feature, likely from early in the day.

Snowpack Summary

Heavy rain fell to ridgetop Saturday before finally turning to snow mid-morning. Now 5 to 25cm of new snow rests on 10 to 40 cm of rain saturated snow. The mid-March crust/facet complex is now down 50-70cm. It's thought that the warmth is helping to strengthen the bond at this interface, but snowpack testing is still producing sudden failures at this interface.

Régions couvertes