Bulletin d’avalanche

Banff Yoho Kootenay

Apr 19 – 20, 2014Parks Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Mon
Tue
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
2 · Modéré
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Points saillants

Hazard is subject to rapid change based on the duration and intensity of the sun over the day. Start early, get up high for the best skiing and get back early. DK

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Cornices appear to be more sensitive to temperature fluctuations. They are just so unpredictable that it would be prudent to give them a wide berth.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Subject to the duration and intensity of the sun. Areas near and around rocks will break down quick and steeper areas have real potential to move and build volume quickly.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    This layer is just so unpredictable. Super stubborn, but terrible consequences if you trigger it; most likely from a shallow rocky location.

Weather Forecast

Expect a mixed bag of light convective snow, sun and gusty west winds. Alpine temps are expected to remain cool and freezing level to 1800ms. A good overnight freeze should make travel easy in early morning but expect any solar aspects to soften up quickly if the sun gets to them.

Snowpack Summary

HST settling and a surface crust will exist in the am and break down over the day on all aspects up to to 1800ms, higher on S and W aspects. Cornices seem to be more sensitive to the temperature fluctuations especially on the solar aspects and have been seen to trigger slabs below both in the storm snow and the deeper persistent layers.

Avalanche Summary

Control work on Sat on a solar aspect produced storm slabs up to sz 2 in the alp and a loose wet, aggressive size 2 below treeline. Natural cornice release in the alpine triggered the slope below to sz 2 and it appears they have become far more sensitive. Forecasters remain cautious about the deep basal layer being triggered from shallow areas.

Confidence

Régions couvertes