Bulletin d’avalanche

Northwest Coastal

Dec 8 – 9, 2011Avalanche Canada
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Archivé · expiré 15 years ago

Danger d’avalanche

Sat
Sun
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–4
    Isolated weak wind slabs may still be lurking below ridge crests, behind terrain features, and in cross-loaded gullies. Especially in the northern part of the region.

Confidence

Fair - Intensity of incoming weather is uncertain on Saturday

Weather Forecast

Friday: Cloudy with light precipitation increasing overnight. Freezing levels rising to 600m and strong westerly winds becoming moderate southwesterly with the onset of steady precipitation. Saturday: Snowfall tapering off throughout the day with 5-10cm expected by the afternoon. Freezing levels drop back to valley bottoms as winds shift to moderate to strong northerlies. Sunday: Mostly clear and dry with light variable winds.

Avalanche Summary

Avalanche activity has tapered off since the large natural glide and wet avalanche cycle earlier in the week.

Snowpack Summary

Light amounts of new snow has buried large surface hoar sitting on a 5-20cm thick melt freeze crust that extends into alpine elevation in the south, and around 1000m in the north. A strong temperature gradient in the top 30cm is causing faceting below the surface crust. This surface hoar/crust/facet combination could become particularly touchy once a sufficiently deep and cohesive slab forms. The mid and lower snowpack are generally well settled and strong.

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