Boletín de aludes

Banff Yoho Kootenay

Dec 31, 2012 – Jan 1, 2013Parks Canada
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Archivado · caducó 14 years ago

Peligro de aludes

Mon
Tue
Alta montaña
1 · Débil
Límite del bosque
1 · Débil
Bajo el límite
1 · Débil
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Lo esencial

Stability is generally good; however, the cold temps are taking their toll in thin snowpack areas. Watch for loose dry avalanches in areas that are completely facetted along with cornice failures on alpine slopes.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–2
    Reports are showing windslabs created in the last week are stubborn to unreactive on lee ridgetop features. Most likely triggerable in aggressive, steep, lee terrain near ridgetops.

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2
    The cold temperatures are facetting out cornices and large cornice failures have been observed. Although the cornice failures have not been triggering slabs on the slopes below, the cornice chunks themselves would definitely hurt if they hit you

  • Loose Dry

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2
    This problem exists mainly in thin snowpack areas E of the divide where the snowpack has completely facetted and lost all cohesion. Watch for sloughing in steep terrain where the snow is unsupportive.

Weather Forecast

A blocking ridge of high pressure will bring sunny skies, cold nights and light northerly winds through the forecast period. Conditions are prime for daytime inversions which means it will be warmer in the alpine than in the valley bottom, although alpine temperatures shouldn't approach zero degrees celsius.

Snowpack Summary

20-40cm thick wind slabs exist in high alpine features and are stubborn to unreactive from field reports.  W of the divide, a well settled snowpack exists in deeper locations with the basal Nov 6 crust well bonded.  In the front ranges E of the divide, a mainly facetted snowpack exists with the Nov 6 basal crust being mainly facetted. 

Avalanche Summary

Lake Louise ski area reported a small, skier triggered avalanche in a steep, thin treeline area today.  This was a loose dry avalanche in an area with a completely facetted snowpack. In a deeper snowpack area, a large cornice failure was reported above the Bourgeau LH ice climb, but did not trigger a slab.

Confidence

The weather pattern is stable

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