Bulletin d’avalanche

Northwest Coastal

Dec 1 – 2, 2011Avalanche Canada
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Archivé · expiré 15 years ago

Danger d’avalanche

Sat
Sun
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Danger ratings remain elevated due to continued snowfall and very strong winds on Thursday.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    2–5
    Hard and soft wind slabs are likely in exposed terrain on a variety of aspects well into treeline.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–5
    Storm snow instabilities may be triggered by a skier or snowmobile, or by additional loading from snow or wind.

Confidence

Poor - Due to limited field observations

Weather Forecast

Conditions will gradually start to dry out on Friday as a ridge of high pressure builds over the province. Winds should ease to moderate from the NW on Friday morning and remain in the light to moderate range throughout the weekend. A mix of sun and cloud is expected on Saturday. Sunday should be mainly cloudy with a chance of flurries. The freezing level should hover around 600-800m throughout the forecast period.

Avalanche Summary

Recent avalanche control work along the northern highway corridors have produced results up to Size 3, mainly involving the recent storm snow. I suspect a natural avalanche cycle is likely late Thursday and into Friday in response to the forecast cranking winds and 15-30cm of snow.

Snowpack Summary

Very strong SW-NW winds may wreak havoc on the snowpack creating scoured areas and soft or hard wind slabs in exposed lee terrain and cross-loaded gullies or terrain features. Coastal areas are reporting a very deep and strong snowpack - at or near record levels for this time of year. A buried surface hoar layer may be found down 100-150cm near Terrace, but there is no recent information on the presence and sensitivity of this layer.

Régions couvertes