Bollettino valanghe

Purcells

Dec 21 – 22, 2012Avalanche Canada
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Archiviato · scaduto 14 years ago

Pericolo valanghe

Sun
Mon
Alta quota
3 · Marcato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
Apri la mappa completa

In sintesi

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    2–5
    Wind slabs should slowly diminish in sensitivity this weekend, but I suspect they're still capable of failing and taking you for a ride. Watch for wind slabs immediately below ridge crest and in the lee of mid slope terrain features like ribs.

Confidence

Good

Weather Forecast

Saturday: Moderate SW ridge top winds diminishing after sunset. Occasional flurries. 1500m temp: -12 Freezing level: SurfaceSunday: Moderate SW ridge top winds. 1500m temp -9. Isolated flurries. Freezing Level: SurfaceMonday: Light E-SE ridgetop winds. Treeline temp -16. No snow. Freezing Level: Surface

Avalanche Summary

We're starting to see the effect of the big winds midweek.  We're getting observations from across the region of a natural avalanche cycle to size 2 in the alpine.  These avalanches are coming from steep terrain below ridgetop.

Snowpack Summary

Winds picked up mid week and moved a lot of storm snow around, especially in the upper treeline & alpine elevations. The recent storm deposited 25-50 cm in the North of the region near Golden, and 30-80 cm further South near the Purcell Wilderness Conservancy. Moderate to strong winds Wednesday/Thursday created windslabs capable of producing size 2 avalanches 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. 

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