Bulletin d’avalanche

Northwest Coastal

Mar 12 – 13, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
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
    Likely
    Taille
    1–4
    Light snow and strong winds have created new wind slabs in exposed terrain. Wind slabs may be particularly reactive in areas where they overlie a weak layer of buried surface hoar.

Confidence

Good

Weather Forecast

Wednesday: 10-15cm of snow is expected with freezing levels remaining in valley bottoms and moderate southeasterly winds. Thursday: Another 10cm or so of new snow, with freezing levels remaining in valley bottoms and light to moderate southerly winds. Friday: 20-30cm of new snow with freezing levels remaining in valley bottoms and moderate southerly winds.

Avalanche Summary

Reports from Monday include several small human-triggered loose snow and soft wind slab avalanches involving the recent storm snow.

Snowpack Summary

15-25cm of unconsolidated new snow is bonding poorly a variety of old surfaces which include: a crust at lower elevations and on solar aspects; old wind slabs in exposed areas, and fairly widespread large surface hoar. Moderate to locally extreme west/southwest winds have redistributed the new snow into soft and hard wind slabs in exposed terrain. This new snow is currently reactive to human triggers primarily where cohesive wind slabs have formed, but reactivity is expected to become more widespread as the overlying slab develops with continued loading. The mid snowpack layers are generally well settled and strong. Facets at the base of the snowpack may resurface as a concern now that spring warming is on the doorstep and full-depth releases are becoming more likely (primarily in the northern part of the region).

Régions couvertes