Bulletin d’avalanche

Banff Yoho Kootenay

Nov 19 – 20, 2011Parks Canada
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Archivé · expiré 15 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

Wind transport triggered two size 2.5 slab avalanches on Bourgeau 7 near Sunshine in the last 24 hrs. These slabs failed on the DH at the ground with crowns approximately 80cm thick and 100m wide. Be very cautious as human triggering is likely. JBW

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Slopes that look inviting for skiing have a wind slab over depth hoar layering. Cracking, whumphing, natural and skier triggered avalanches have been observed. This layer collapses with EASY results. Pick lower angled low consequence terrain.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Steep open slopes at and above treeline have a soft to hard surface slab that is sensitive to human triggering near the ground on the basal depth hoar. Wind loading triggered Na avalanches up to size 2.5 that failed to ground in the last 24 hrs.

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Régions couvertes