Boletín de aludes

South Coast

Dec 24 – 25, 2011Avalanche Canada
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Archivado · caducó 15 years ago

Peligro de aludes

Mon
Tue
Alta montaña
3 · Notable
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–3
    Wind slabs have developed on lee and cross-loaded terrain in the alpine and at treeline. They can be quite reactive, especially where they over-ride last weekends rain crust or weak facets (sugar snow) from the early December dry spell.

Confidence

Fair - Intensity of incoming weather is uncertainfor the entire period

Weather Forecast

Sunday: 7cm of new snow - moderate southwest winds - alpine temperatures of -8.0Monday: 8cm of new snow - moderate southwest winds - alpine temperatures of -9.0Tuesday: 20cm of new snow - moderate southwesterly winds - alpine temperatures of -7.0

Avalanche Summary

No new avalanche activity reported in the last 24 hours. Fresh wind slabs and cornices are sensitive to human-triggers and will continue to be with forecast weather.

Snowpack Summary

Dribs and drabs of new snow with moderate winds have been the norm over the last week. Wind-exposed slopes are predominately scoured and pressed, with pockets of wind slab from 10 to 35cm deep on North to East aspects at treeline and in the alpine. This recent snow overlies a weak rain crust that formed last weekend. This crust extends to treeline elevations and overlies buried surface hoar and/or facets 10cm below. Generally speaking, confidence in this interface is growing, especially since it has'nt seen a significant load at the elevations where it exists. In the alpine where the crust does not exist, a stiffer wind slab may over-ride surface facets that formed during the early December dry spell. A compression test on thursday showed easy, sudden results 35cm below the surface at 2250m on a North aspect.The mid and lower snowpack are generally well-settled and strong. Snowpack depths at treeline sit at about 130 throughout the region.

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