Boletín de aludes

Kootenay Boundary

Jan 14 – 15, 2012Avalanche Canada
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Archivado · caducó 15 years ago

Peligro de aludes

Mon
Tue
Alta montaña
2 · Moderado
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
    Possible - Likely
    Tamaño
    1–4
    Fresh wind slabs are lurking below ridge crests, behind terrain features, and in cross-loaded gullies.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–5
    Weak surface hoar is primarily a concern on big unsupported sheltered glades on east through north aspects. Basal depth hoar and facets are a concern on slopes with shallow and variable snowpack depths, especially near ridges and summits.

Confidence

Fair - -1

Weather Forecast

SUNDAY: Light precipitation with light winds from the west. Temperatures dropping to -15 degrees celsius. MONDAY: Light precipitation with continued cold temperatures. Winds moderate from the west. TUESDAY: Continued light precipitation and cold temperatures.

Avalanche Summary

Recent observations include isolated small human-triggered wind slab and loose snow avalanches near ridgecrests.

Snowpack Summary

Recent light amounts dry snow has maintained the snow supply for fresh wind slab development and cornice growth. Surface condition in wind-exposed areas is highly variable with scoured areas, sastrugi, and pockets of fresh hard and soft wind slabs. Cold temperatures are promoting surface faceting, and a new batch of surface hoar is growing in sheltered areas. A thin melt/freeze crust can be found in the upper snowpack as high as 1900m, and some areas are reporting surface hoar buried early-January now down 10-30cm. The late-December interface is now down 30-60cm and producing moderate to hard resistant snowpack test results. The mid-December surface hoar/facet persistent weakness, down 40-100cm, is generally producing anywhere from easy results where it's shallow to hard results where it's deeper. But recent tests on a north facing treeline slope produced easy results where the surface hoar was found down 70cm, and all tests consistently show a high propensity to propagate fractures. Recent whumpfing suggests basal facets remain concern in shallow snowpack areas especially with heavy triggers in thin spots, and weaknesses in the slab above create the potential for step-down avalanches.

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