Bulletin d’avalanche

Northwest Coastal

Feb 16 – 17, 2012Avalanche 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

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Snow and variable winds will have set up wind slabs at treeline and in the alpine.

Confidence

Good

Weather Forecast

Friday: Trace amounts of snow / light to moderate southwest winds / Freezing level at 700m Saturday: Trace amounts of snow / moderate to strong easterly winds / Freezing level at 600m Sunday: Trace amounts of snow / light southerly winds / freezing level at 600m

Avalanche Summary

A size 1 skier-triggered wind slab was observed on a northeast alpine feature on Wednesday.

Snowpack Summary

Light amounts of recent snowfall now sit on top of a strong melt freeze crust that exists below 1000m on all aspects and wind-pressed powder on shaded alpine features. Variable winds have redistributed surface snow into isolated pockets of wind slab on a variety of aspects in the alpine, although the reactivity of these windslabs has been most recently described as stubborn. The aforementioned new snow may overly buried a surface hoar layer (crystal size reported to be 1-4 mm) at treeline and below. This surface hoar layer seems most prevalent in protected inland areas. Deeper within the snowpack, a facet layer buried around Jan 20th is the greatest concern although triggering seems unlikely. This layer lies approximately 110-140 cm below the surface and still exhibits hard, sudden planar results in isolated snowpack tests.

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