Bulletin d’avalanche

Purcells

Dec 20 – 21, 2012Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Sat
Sun
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–4
    Continued light snowfall with moderate SW winds will add to the wind slab problem.  These slabs range from 20 cm in the North to 60 cm in the South of the region.  They may be sensitive to the weight of a sled or skier.

Avalanche Summary

Avalanche observations from Wednesday were limited to isolated sluffing from north facing alpine terrain in the Southern Purcells.

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain for the entire period

Weather Forecast

Friday: Light to moderate S/SW winds.  Treeline temp -10. Occasional flurries. Freezing Level: Valley bottom.Saturday: Light to moderate S/SE winds. Treeline temp -12.  Occasional flurries increasing to light snow around sunset. Freezing Level: Valley bottom.Sunday:  Light west winds.  Treeline temp -8.  No snow.  Freezing Level: Valley bottom.

Snowpack Summary

The recent storm deposited 15-20 cms in the North of the region near Golden, and 20-50 cms further South near the Purcell Wilderness Conservancy.  Moderate to strong winds Wednesday/Thursday created windslabs 20 - 60 cm in depth at and above treeline.  Windslab distribution and size is wildly inconsistent across the region, but it feels like they grow in size as you travel further south.  There is some talk about a December 16th surface hoar layer, but it's distribution is *very* spotty. 

Régions couvertes