Bulletin d’avalanche

Jasper

Dec 20 – 21, 2011Parks Canada
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Archivé · expiré 15 years ago

Danger d’avalanche

Tue
Wed
Alpin
3 · Marqué
Limite forestière
4 · Fort
Sous la limite
2 · Modéré
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Points saillants

Strong to extreme winds coupled with warm temperatures are creating hard, easily-triggered windslabs in most treeline lee features as well as pockets of the alpine that are sheltered enough to hold snow.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Windslabs have formed in sheltered lee features at Treeline and protected pockets in the Alpine.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    Anywhere from 5-35cm of new snow fell Saturday evening. Warm temperatures and winds have stiffened the storm snow into a more cohesive soft slab layer. Some pockets of soft slab may release from skier presence.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    Basal facet collapses are still being noted in test pits below midpack bridging layers. Shallow snowpack areas and rocky outcrops are likely trigger locations.

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Wind effect is extremely variable

Régions couvertes