Bulletin d’avalanche

Kootenay Boundary

Jan 31 – Feb 1, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Sat
Sun
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
    1–4
    Be alert for wind slabs behind terrain breaks such as ridges and ribs.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–4
    A mixed bag of weak interfaces is buried about 40 cm down. As temperatures rise, the likelihood of triggering a persistent slab may increase.

Confidence

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

Weather Forecast

Friday: Light W winds. Alpine temperature near 0. Thin cloud, with sunny breaks. No snow.Saturday: Light W winds. Alpine temperature near +2. Sunny skies, with valley cloud. No snow.Sunday: Moderate SW wind. Alpine temperature near -7. Light snow.

Avalanche Summary

Size 1 to 2 loose dry avalanches have been failing with natural and human triggers in steep terrain. Increasingly, human-triggered slabs (size 1 to 2) are failing on the Jan 23 interface. In many cases, these events have been on wind-loaded aspects.

Snowpack Summary

Recent NW winds have redistributed 15-40 cm of recent snow into soft or hard slabs on lee slopes in the alpine and at treeline. A weak interface buried on Jan 23 seems to be becoming more reactive as the slab above settles and becomes more cohesive. Deeper, about 50-60cm down, a weak interface buried in early January exhibits moderate to hard, sudden results in snowpack tests. The snowpack below this is generally well bonded. Forecast warming may increase the likelihood of triggering a persistent slab.

Régions couvertes