Bulletin d’avalanche

Northwest Coastal

Feb 20 – 22, 2012Avalanche 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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Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–5
    Moderate to strong winds combined with new snowfall will create new and reactive wind slabs on lee terrain. Expect wind slab development to occur throughout the forecast period.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–5
    With forecast snow new storm slabs will develop. These may be touchy, and could be destructive.

Snowpack Summary

The last week has seen dribs and drabs of snowfall with light winds in most areas. The recently fallen snow sits over a strong melt freeze crust that exists below 1000m on all aspects and over wind-pressed powder on shaded alpine features. Sandwiched between the newer snow and the aforementioned older surfaces may be a buried surface hoar layer at treeline and below. This surface hoar layer seems most prevalent in protected inland areas. Where it exists, we expect to see gradually increasing reactivity in the surface hoar interface with loading and slab development forecast for this week. Check out our Forecaster's Blog for some insight on incremental loading. The mid and lower snowpack is generally well settled and strong.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Tuesday: New snow accumulations up to 35cm overnight Monday throughout the day on Tuesday. Ridgetop winds 45-70km/hr from the West. Freezing levels near 1000m. Wednesday: Snow amounts 10-15cm. Ridgetop winds 45-55km/hr from the NW. Treeline temperatures near -6. Thursday: Mainly dry. Freezing levels will lower to valley bottom in the morning, then spike near 400m in the afternoon.

Avalanche Summary

Reports of natural sluffing on steep terrain features. One size 1 skier triggered avalanche was reported on Sunday. This occurred on a SW aspect @ 1800m from a convex , wind loaded feature. With forecast wind and snow, avalanche activity may increase.

Régions couvertes