Bulletin d’avalanche

Banff Yoho Kootenay

Apr 3 – 4, 2014Parks Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Sat
Sun
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Excellent ski quality on N aspects. Avoid thin snowpack areas where the basal layers can be triggered. SH

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    With increased winds and some snow in the forecast, watch for wind slab formation in the lees of ridge crests over the next 24 hours.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    We have seen isolated activity on depth hoar and facets located near the base of the snowpack in thin areas mainly E of the divide. The main problem right now is triggering the occasional large avalanche that fails on the ground. 

Weather Forecast

The sun should not be a large factor over the next couple days. Up to 10cm is expected thursday night through Friday with temperatures staying fairly cool in the alpine (-10C at 3000m) and highs of around 0C at valley bottom. Westerly winds will pick up tonight into Friday gusting as strong as 75 km/h in alpine areas.

Snowpack Summary

Western areas such as Emerald and Field have a deep and stable snowpack. Contrast this with the Lake Louise and Sunshine areas, where a weaker snowpack is showing signs that the ground level layer of facets is waking up again - slowly. This layer has been dormant since February. A crust exists on all but N aspects.

Avalanche Summary

Lake Louise avalanche safety was reporting large whumpfs in shallow alpine areas today.  A profile on one of these slopes found very easy compression results on the basal depth hoar.  Yesterday a size 2.5 failed on the ground from an explosive at the Lake Louise ski area, and a cornice failure on Mt. Rundle triggered an avalanche in the afternoon.

Confidence

Régions couvertes