Bulletin d’avalanche

Northwest Coastal

Apr 14 – 15, 2014Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

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

This bulletin has been produced using very limited field data. If you've been out in the mountains we'd love to hear about what you've seen. Observations can be sent to [email protected]

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    Forecast snowfall will add to existing deep storm slabs which formed last week. Although these storms slabs have become less likely to trigger, large avalanches may still result where they overlie weak layers buried at the beginning of April.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    3–7
    Deep and destructive persistent slab avalanches will become less likely with the forecast cooling trend. Possible triggers include cornice fall, warming and intense solar radiation.

Confidence

Fair - Due to the number of field observations

Weather Forecast

Tuesday: Light to locally moderate snowfall / Light to moderate southwest winds / Freezing level at 1000mWednesday: Mix of sun and cloud / Light to moderate southwest winds / Freezing level at 1250mThursday: Moderate to locally heavy snowfall / Moderate to strong southwest winds / Freezing level at 1250m

Avalanche Summary

Although recent observations have been extremely limited, a solar induced natural avalanche cycle to size 3 occurred over the weekend. Loose wet and slab avalanches were noted in this cycle with most activity occurring in steep terrain. Of note, a size 4 deep persistent avalanche occurred in the far north of the region. It released initially within the recent storm snow and stepped down to basal facets. Solar induced activity is expected to taper-off with a possible shift to wind slab activity with forecast weather.

Snowpack Summary

Last week's storm brought 90+ cm or more to coastal regions forming thick storm slabs on leeward features. Warmer temperatures have helped to settle the recent snow, although the storm snow may continue to be touchy where it overlies surface hoar, crusts and/or facets buried at the beginning of April. Sun exposed slopes and lower elevation terrain has seen a daily melt-freeze cycle, and many slopes below treeline are likely isothermal. Large cornices have formed and loom over slopes below.The early February crust/facet layer is down 150 - 240 cm. Triggering this destructive layer will become unlikely with forecast cooling.

Régions couvertes