Boletín de aludes

Cariboos

Nov 23 – 24, 2013Avalanche Canada
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Archivado · caducó 13 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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Lo esencial

Forecasts are based on very limited observations. Dig down, test weak layers and keep an eye on rising temperatures Monday.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–3
    Recent wind has hammered alpine areas. Wind slabs are most likely found on lee slopes and behind terrain features.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    3–5
    Last week, large avalanches failed on a buried crust/facet combo near the base of the snowpack. Rider triggers may be possible, especially on northerly slopes in alpine terrain that did not previously avalanche.

Confidence

Poor - Due to the number of field observations

Weather Forecast

High pressure will strengthen though the forecast period. This will slowly bring warmer temperatures to upper elevations and no significant precipitation is expected.Sunday: A mix of sun and cloud. Alpine temperatures -4. Freezing levels 1600 m. Ridgetop winds from the NW. Monday/Tuesday: Cloudy with some sunny periods. Alpine temperatures near 0 degrees. Freezing levels rising to 2500m. Ridgetop winds will be light from the South.

Avalanche Summary

Last weeks storm, triggered a widespread natural avalanche cycle in the alpine. Size 2-3 slab avalanches were reported throughout the region. Recently no new avalanches have been reported. However, isolated large slab avalanches may still be rider triggered, especially on slopes that didn't previously avalanche.

Snowpack Summary

Average snowpack depths at upper elevations sit near a metre or more. Recent storm snow seems to be settling, but wind slab problems likely exist.A surface hoar layer may exist 60-120 cm down but seems to be spotty, and drainage specific. Have you seen any?A bigger concern is a melt-freeze / rain crust that formed early October. This is generally found from 80-180 cm down near the base of the snowpack. On northerly aspects a more predominant crust/ facet combo may exist and allow for wider propagations. especially in places that have smooth ground cover (glacier ice, grassy slopes, rock slabs etc.).Snowpack conditions may change and deteriorate as temperatures rise in the alpine.

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