Boletín de aludes

Kootenay Boundary

Mar 5 – 6, 2013Avalanche Canada
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Archivado · caducó 14 years ago

Peligro de aludes

Thu
Fri
Alta montaña
3 · Notable
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Lo esencial

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–4
    Recent snow and wind have formed touchy wind slabs on all aspects. Rider triggering is likely, especially on lee slopes that have been wind loaded.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–6
    The presence of weak layers buried in the upper snowpack means there is a risk of triggering surprisingly large slab avalanches.

Confidence

Good

Weather Forecast

Tonight and Wednesday: A low pressure system moves inland to the South of the border. Light-moderate precipitation will begin this evening over the Southern ranges. Ridgetop winds light from the SE. Alpine temperatures near -5 and freezing levels 1300 m. Thursday: Mainly cool and dry with some clouds. Ridgetop winds light from the NW. Alpine temperatures near -7 and freezing levels at 1200 m. Friday: The ridge will remain over the region with mainly dry, sunny conditions. Ridgetop winds light from the NW. Alpine temperatures near -7 and freezing levels at 1300 m.

Avalanche Summary

On Monday, natural slab avalanche activity occurred up to size 2 on N-E aspects and above 2000 m. Numerous natural loose dry avalanches also occurred up to size 1.0 from steeper terrain features.

Snowpack Summary

In much of the region, up to 80 cm recent snow overlies older interfaces comprising of surface hoar and sun crusts. The storm slab above these interfaces has the potential for wide propagations and surprisingly large avalanches.Wind slabs and new cornice development exist at ridgelines and on lee slopes. These are likely sensitive to human triggers. A strong melt-freeze crust exists at 1700 m and below and is generally bridging any deeper instabilities. The average treeline snow depths sit near 250 cm.

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