Bulletin d’avalanche

Northwest Coastal

Feb 11 – 12, 2012Avalanche Canada
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Archivé · expiré 15 years ago

Danger d’avalanche

Mon
Tue
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    3–6
    Large cornices are looming over some slopes which could act as a trigger for large, deep avalanches if they collapse.

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    Wind slabs are forming behind ridge lines in response to new snow and southwesterly winds.

Confidence

Good - -1

Weather Forecast

Saturday night: light precipitation with 5-10 mm expected. Freezing level around 700 m. Strong southwesterly winds. Sunday: Winds veering to moderate northwesterly. Lingering flurries in the morning, later becoming dry as a high pressure ridge builds. Freezing level around 700 m. Monday: Dry and sunny. Light winds. Freezing level at valley bottom. Tuesday: another weak frontal system will bring light precipitation and moderate southwesterly winds.

Avalanche Summary

No recent avalanches have been reported from this region.

Snowpack Summary

Approximately 5 cm of new snow at treeline and above has buried a surface hoar layer (crystal size reported to be 1-4 mm) lying on old surfaces comprising crusts and variable wind slabs. The crusts formed in response to successive melt-freeze cycles and are harder and thicker the lower in elevation you go. The wind slabs were deposited on a variety of aspects and are becoming increasingly stubborn and difficult to trigger. Deeper within the snowpack, a facet layer buried around Jan 20th is the greatest concern. 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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