Boletín de aludes

Sea To Sky

Apr 4 – 5, 2012Avalanche Canada
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Archivado · caducó 14 years ago

Peligro de aludes

Fri
Sat
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
    Possible - Likely
    Tamaño
    1–5
    Generally lurking below ridgecrests, behind terrain features, and in gullies. Thick fresh wind slabs are highly sensitive to human triggers and cornice falls, and sun-exposure is expected to make things even more touchy.

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–6
    Large and weak cornices could easily start popping off with sun-exposure. Not only are they a hazard in themselves, but can also act as a heavy trigger for very large avalanches on the slope below.

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–6
    Storm slabs could be easily triggered and have the potential to step-down to deeper weaknesses, especially with solar warming.

Confidence

Good

Weather Forecast

Thursday: Unsettled conditions with scattered flurries and sunny breaks. Freezing levels around 1000m and light northerly winds. Friday and Saturday: A ridge of high pressure is expected to keep things mainly sunny and dry. Freezing levels are expected to hover around 800-1000m on Friday and slightly rise to 1200m for Saturday. Winds should remain light from the north.

Avalanche Summary

Reports from Tuesday include numerous easily triggered wind and storm slab avalanches up to Size 3. The slabs showed a high propensity to propagate fractures with remote and sympathetic triggers and entire bowls releasing wall-to-wall. Most of the avalanches involved the most recent storm snow, but a few stepped-down over a metre to the crust from late March.

Snowpack Summary

Over 60cm of new snow in the past couple of days was redistributed by strong southwesterly winds into thick wind slabs. A predominately crusty weak interface from late March, now down 50-150cm, remains a potential failure layer for large slab avalanches, especially with heavy triggers such as cornice falls and step-down avalanches. The potential for remote triggering, step down avalanches, and wide propagations, makes the current snowpack structure particularly tricky to manage.

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