Boletín de aludes

Northwest Inland

Jan 9, 2017Avalanche Canada
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Archivado · caducó 10 years ago

Peligro de aludes

Mon
Tue
Alta montaña
3 · Notable
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Lo esencial

Weak, sugary snow at the bottom of the snowpack remains a primary concern. This is especially true in large, steep, and rocky alpine features with variable snowpack depths.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2
    Forecast strong to extreme easterly winds may form wind slabs in unusual places such as open areas below treeline.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    2–3
    This is a low probability, high consequence scenario and requires a conservative approach to larger terrain features. Avoid likely trigger spots such as steep and rocky areas with a shallow snowpack.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

MONDAY: Mix of sun and cloud, strong to extreme easterly ridgetop winds, and temperatures around -20 C.TUESDAY: Mostly sunny with cloudy periods, moderate to strong northeasterly ridgetop winds, and temperatures around -15 C.WEDNESDAY: Mostly sunny with cloudy periods, moderate northeasterly ridgetop winds, and temperatures around -10 C.

Avalanche Summary

Over the past week there have been a couple natural deep persistent avalanches to size 3.5. These are large, destructive avalanches that failed on sugary facets at the bottom of the snowpack and ran long distances.

Snowpack Summary

10-20 cm of recent snow with northerly winds have likely created fresh wind slabs sitting on top buried surface hoar and/or facets. Snow depth at treeline varies from about 1 m in most areas to 2 m in deeper snowpack areas in the south and west of the region, and up to 250 cm in the alpine. The shallow snowpack areas mostly consist of weak facetted or sugary grains beneath hard slabs. These hard slabs may produce surprisingly long fractures resulting in large avalanches, and in some instances they may step down to weak snow crystals near or at the ground. In addition to the facets, a thick layer of buried surface hoar may be found 30-40 cm below the surface. There is another persistent weakness that formed during the early December cold snap which is now about 50-70 cm deep. A crust from mid-November may be lurking close to the ground nestled in amongst the facets.

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