Boletín de aludes

Kootenay Boundary

Jan 4 – 5, 2012Avalanche Canada
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Archivado · caducó 15 years ago

Peligro de aludes

Fri
Sat
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–5
    Fresh wind slabs are lurking below ridge crests, behind terrain features, and in cross-loaded gullies. New cornices are also weak.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    2–5
    Persistent weaknesses remain susceptible to human-triggers, including remote triggering. Although cooling temperatures throughout the forecast are period

Confidence

Good - -1

Weather Forecast

5-10cm possible overnight Wednesday, with another 5-10cm expected on Thursday. Freezing levels could reach as high as 2000m Wednesday evening before dropping to 1200m on Thursday with continued strong southwesterly winds. Friday and Saturday should be mostly dry with freezing levels back to valley bottoms and light westerly winds.

Avalanche Summary

There are two recent reports of skiers remotely triggering avalanches running on the mid-December surface hoar. One was relatively small on a steep lee slope triggered from a ridge 10m away. The other was a 30-80cm thick Size 2 that was triggered by a cornice fall, which was remotely triggered from a skier 3m away on the ridge crest.

Snowpack Summary

New snow and gusty winds are keeping wind slabs and cornices fresh and weak, and in some places buried old wind slabs are a concern. A lightly buried thin crust extends into treeline elevations. Compression tests have been producing easy to moderate sudden results on the mid-December surface hoar, down 30-80cm, and propagation tests and whumpfing have shown that avalanches associated with this persistent slab have a high propensity to propagate over large areas. Other weaknesses within the slab create the potential for step-down avalanches. Basal facets and depth hoar remain a concern in shallow rocky areas.

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