Bulletin d’avalanche

Northwest Coastal

Mar 3 – 4, 2014Avalanche Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

Wed
Thu
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–4
    Strong Easterly winds continue to scour slopes and develop hard wind slabs in areas that have snow available for transport.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–5
    North aspects in the alpine are the most likely slopes for human triggering the February weak layer. Avalanches releasing on this deeply buried persistent weak layer may be large and destructive.

Avalanche Summary

Over the weekend a minor natural avalanche cycle occurred in the northern part of region. Slab avalanches up to size 2 were reported from alpine and treeline cross loaded features. North aspects in the alpine continue to be the most likely slopes for triggering the February weak layer where it may be well preserved and allow for long fracture propagations resulting in very large avalanche.

Confidence

Fair - Wind effect is extremely variable

Weather Forecast

Tuesday: Cloudy with sunny periods. Alpine temperature -10.0 and ridgetop winds light from the North. Wednesday: Mostly sunny. Alpine temperatures -11.0 and ridgetop winds moderate from the East.Thursday: Cloudy with snow amounts near 5 cm. Alpine temperatures near -6.0 and ridgetop winds light-moderate from the East. Freezing levels 300 m.

Snowpack Summary

Cold arctic air has developed melt-freeze crusts on all aspects at lower elevations, and all but North aspects in the alpine. No recent reports of whumpfing or remote triggering on this weak layer of crusts and facets. Forecast strong Northeast outflow winds may continue to develop wind slabs in areas that still have snow available for transport. Basal facets and/or depth hoar remain a concern in shallow snowpack areas in the northern part of the region. Cornices are also large and may become weak if northerly winds start to undercut them.

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