Bulletin d’avalanche

Kootenay Boundary

Mar 18 – 19, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

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

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–5
    Be alert for wind slabs behind ridges and terrain breaks. Cornices may be touchy too.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    New snow is likely to slide easily on a buried crust. It may have enough force to trip you up or carry you into a terrain trap.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Be wary of travelling on or below steep slopes which are being warmed by direct sun. Storm snow may fail naturally with the influence of solar radiation.

Confidence

Fair - Timing or intensity of solar radiation is uncertain on Tuesday

Weather Forecast

Monday night: No snow. Moderate NW winds. Alpine temperature near -12.Tuesday: No snow. Sunshine. Light to moderate SW winds. Alpine temperature near -9.Wednesday: Heavy snow (20- 35 cm). Strong to extreme SW winds. Alpine temperature near -3.Thursday: Light snow. Light SW winds. Alpine temperature near -10.

Avalanche Summary

Numerous size 1-2 avalanches were triggered naturally, by skiers, explosives and vehicles on Sunday. In most cases, the new snow was failing on the hard crust below. Many were soft slabs where the wind had shifted the snow onto lee slopes, and several were loose dry avalanches.

Snowpack Summary

Around 20-30 cm of recent storm snow overlies a hard refrozen crust in most places. Strong variable winds have shifted this new snow into touchy wind slabs in the lee of terrain breaks. In non-wind affected steep terrain, sluffs are running easily.Deeper in the snowpack, weak surface hoar/crust interfaces have become much less likely to be triggered now that they are capped by a supportive rain crust. However, I’d remain wary of any spots where the crust above is not as strong.

Régions couvertes