Boletín de aludes

Kootenay Boundary

Apr 18 – 19, 2016Avalanche Canada
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Archivado · caducó 10 years ago

Peligro de aludes

Wed
Thu
Alta montaña
Sin grado
Límite del bosque
Sin grado
Bajo el límite
Sin grado
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Lo esencial

Spring Conditions. Record setting temperatures and ongoing sunny weather will increase the likelihood of large destructive wet slab avalanches, especially if there is little or no overnight refreeze of the snow surface.

Problemas de aludes

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    2–5
    If the sun is shining, cornices present a significant hazard. Even if they don't trigger a slab avalanche when they fall onto a slope, they have a nasty habit of running surprisingly long distances.

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–3
    Solar radiation in the spring can rapidly change the hazard from low to high. Plan ahead and monitor the effect of solar radiation carefully.

  • Wet Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    3–6
    Extremely high freezing levels and little to no overnight surface freeze will increase the potential for deep wet slab release.

Weather Forecast

TUESDAY: Freezing Level: 3800m, sunny, light westerly ridgetop winds. WEDNESDAY: Freezing Level: 3700m, sunny, light southerly ridgetop winds. THURSDAY: Freezing Level: 3400m, mix of sun and cloud, light southerly ridgetop winds.

Avalanche Summary

Most commercial operations have closed for the season, and data is becoming sparse. However, with the extremely high freezing levels, sunny skies, and lack of overnight surface freezing, I would expect cornice failures and sporadic large wet slab avalanches.

Snowpack Summary

Monitoring the overnight freeze of the snow surface is very important during the spring. If the snow surface does not freeze overnight or if the crust is only a few cm thick, the effect of daytime heating and solar radiation will weaken the snowpack much more quickly than it would if there is a well frozen thick crust. This is because the crust must first melt before the sun can weaken the snowpack. Deeply buried weak layers in the mid snowpack and near the ground still have the potential to wake up and become active with a rapid warm up. While unlikely, releases on these deeply buried weak layers would result in very large avalanches. Glide cracks are widespread, active, and best avoided. Cornices are large, fragile, and could trigger deep slab avalanches that run to valley bottoms. Low elevation and thin snowpack areas have become isothermal, meaning the snowpack is 0 degrees Celsius throughout. An isothermal snowpack is more prone to full depth wet slab avalanches during the heat of the day.

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