Boletín de aludes

Northwest Coastal

Nov 27 – 28, 2011Avalanche Canada
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Archivado · caducó 15 years ago

Peligro de aludes

Tue
Wed
Alta montaña
4 · Fuerte
Límite del bosque
4 · Fuerte
Bajo el límite
4 · Fuerte
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Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Very Likely
    Tamaño
    2–6
    Expect to find deep and dense wind slabs in exposed terrain well below ridge crests.

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely - Very Likely
    Tamaño
    2–5
    Weaknesses may exist within or under the recent storm snow.

Confidence

Fair - Due to limited field observations

Weather Forecast

Another strong frontal system should reach the area by Monday morning bringing heavy snowfall and strong southwesterly winds. Expect another 25-40cm with this storm. The freezing level should be around 1000-1200m on Monday. Precipitation should taper off on Tuesday as a ridge of high pressure builds in. Mainly sunny skies are expected on Wednesday. The freezing level should be around 500-800m on Tuesday and Wednesday.

Avalanche Summary

Recent reports are limited to the run out zones along the highway corridors near Bear Pass and Terrace. I expect a widespread natural avalanche cycle occurred in many areas on Saturday and into Sunday.

Snowpack Summary

Saturdays system dumped another 50-75cm in many areas. The snowpack depth near treeline is already around 300cm. Fluctuating freezing levels and varying precipitation intensity and wind throughout the recent storms has probably resulted in various weaknesses within upper snowpack. A buried surface hoar layer may be found down close to 100cm, but there is no recent information on the presence and sensitivity of this layer. The mid and lower snowpack is generally well settled and strong with an old rain crust near the ground.

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