Bulletin d’avalanche

Northwest Coastal

Nov 21 – 22, 2011Avalanche Canada
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Archivé · expiré 15 years ago

Danger d’avalanche

Wed
Thu
Alpin
4 · Fort
Limite forestière
4 · Fort
Sous la limite
3 · Marqué
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Points saillants

This bulletin is based on limited data. Local variation in conditions and danger levels are likely to exist. To produce more accurate forecasts, we need information. Please send an email to [email protected]

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    2–5
    Near ridge crests and terrain breaks, and in cross-loaded gullies. Heavy loading from wind probably resulted in natural avalanche activity.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–4
    Storm slabs are likely very touchy, especially where they are sitting on surface hoar.

Confidence

Fair - Due to limited field observationsfor the entire period

Weather Forecast

Tuesday: Expect another 30-40cm, especially in southern coastal areas, with freezing levels as high as 700m and strong southwesterly winds.Wednesday: Continued moderate snowfall in southern coastal areas with another 30-40cm possible. Freezing levels back down to valley bottoms and strong southwesterly winds.Thursday: Another pulse of moderate snowfall is expected.

Avalanche Summary

No recent avalanche have been reported, but I suspect natural avalanche activity occurred in response to recent heavy loading from snow and especially wind. I expect natrual avalanche activity to continue as long as it's snowing asn blowing, and the potential for human-triggering to remain for the forecast period.

Snowpack Summary

As of Monday afternoon, recent storm snow totals were in the 30-60cm range. Varying temperature, precipitation intensity, and wind throughout the recent storm, as well as surface hoar on the previous snow surface, has probably resulted in various weaknesses within and under the recent storm snow. Previous storm snow weaknesses could also be lurking in the upper snowpack. The mid and lower snowpack is generally well settled and strong with an old rain crust near the ground.

Régions couvertes