Bulletin d’avalanche

North Columbia

Apr 15 – 16, 2017Avalanche Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

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

Falling cornices continue to trigger large avalanches. Solar radiation and rapidly rising freezing levels make this a very real possibility on Sunday.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Convective flurries and moderate southwesterly winds have created wind slabs in lee features at treeline and above that were reactive to human triggers on Saturday.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    Minimize exposure to slopes with large cornices overhead when it is cool and cloudy and completely avoid them if it is warm and/or sunny.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    Small loose wet avalanches have the potential to trigger large avalanches on sugary facets near the bottom of the snowpack.

Confidence

High -

Weather Forecast

SUNDAY: Sunny. Light southwesterly ridgetop winds. Freezing level RAPIDLY RISING to 1900 m.MONDAY: Mix of sun and cloud with isolated flurries. Light southwesterly ridgetop winds. Freezing level around 1800m.TUESDAY: Cloudy with flurries. Light southerly ridgetop winds. Freezing level around 1900m.

Avalanche Summary

Several cornice triggered deep persistent slab avalanches failing on facets deep in the snowpack were reported on north aspects in the alpine on Friday. One size 3.5 at Rogers Pass and two north of Revelstoke (size 2-2.5). The key weather factor to keep your eye on this weekend will be the sunshine accompanied by rising freezing levels. These are common trigger for cornices which is currently our primary concern due to their ability to trigger large avalanches.

Snowpack Summary

Cornices are large, looming, and the primary concern due to their potential to trigger large avalanches failing on facets at the bottom of the snowpack. Convective showers and moderate southwesterly winds have formed small wind slabs on lee features below ridgetops. Solar radiation is a common trigger for loose wet avalanching in steep terrain, especially when new snow gets heated by the sun for the first time.

Régions couvertes