Boletín de aludes

Purcells

Apr 21 – 22, 2012Avalanche Canada
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Archivado · caducó 14 years ago

Peligro de aludes

Mon
Tue
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
3 · Notable
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Problemas de aludes

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Very Likely - Certain
    Tamaño
    1–5
    Loose wet snow avalanches are expected with warming forecast for the weekend. Watch for increased activity in steep, sun-exposed rocky terrain. Loose snow avalanches may entrain a great deal of mass and may trigger deeper weak layers.

  • Wet Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–5
    With warming forecast for Sunday and Monday, wet slabs become more likely. A number of crusts in the upper snowpack may act as a suitable sliding layer for wet slabs.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    3–7
    Avalanches may release on the deeply buried weak layers from February or from depth hoar that developed early winter. The likelihood will increase if warm temperatures persist and there is no overnight freeze.

Confidence

Fair - Timing or intensity of solar radiation is uncertain

Weather Forecast

The region will see mostly scattered cloud on Sunday with the possibility of light rain on Monday. Freezing levels will sit at about 3000m for both days with moderate southwesterly ridgetop winds.

Avalanche Summary

Several size 2 point releases and slab avalanches were observed running within the storm snow on Friday. There will be a shift to wet loose and wet slab instabilities on Sunday and Monday as freezing levels rise.

Snowpack Summary

On Thursday night, light to locally moderate amounts of snow fell forming wind slabs that most likely settled considerably or turned to wet slabs with warming on Saturday. The recently fallen snow overlies well settled powder, melt-freeze crust sandwiches and wet grains. At lower elevations, warm temperatures continue to penetrate and weaken the isothermal snowpack. Deeper in the snowpack there are layers that may not be reactive with cooler temperatures, but should be on your radar as spring brings more prolonged periods of warm weather. These layers include near surface crusts, the early-February surface hoar (about 100-170cm down) and basal facets. Cornices in region are also large and will become weak with warm temperatures.

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