Boletín de aludes

Northwest Inland

Jan 30 – 31, 2013Avalanche Canada
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Archivado · caducó 14 years ago

Peligro de aludes

Fri
Sat
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
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
    Likely
    Tamaño
    1–5
    New snow and strong shifting winds will build touchy wind slabs that are likely found behind terrain breaks such as ridges and ribs. Hollow sounds and cracking snow is a good indicator of unstable snow.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–5
    Buried beneath the new snow sits a surface hoar/crust/facet weakness. This may be sensitive to rider triggers in steeper sheltered terrain or over convex rolls.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    2–5
    A deeply buried weak layer near the base of the snowpack could be triggered by large loads such as a cornice collapse or from a thin-spot trigger point.

Confidence

Poor - Due to limited field observations

Weather Forecast

Thursday:  Cloudy, unsettled conditions. Snow amounts up to 10 cm. Ridgetop winds blowing 30-50 km/hr from the West. Alpine temperatures near -2 and freezing levels rising to 800 m.Friday: Continued cloudy skies and snow amounts near 5 cm. Ridgetop winds light from the SW. Alpine temperatures near -2 with freezing levels rising to 900 m.Saturday: Snow amounts 5-10 cm with ridgetop winds light from the South. Alpine temperatures near -3 and freezing levels sitting near 800 m.

Avalanche Summary

Loose dry sluffing from steep terrain. One skier triggered size 2.0 from a NE aspect around 1280 m, from a 40 degree slope.

Snowpack Summary

New storm snow (30-50 cm) is building over a variety of old surfaces including old wind slabs, scoured thin slopes, blue ice, thin melt-freeze crusts and surface hoar. The new storm snow may have a poor bond with the old surfaces buried below. With little observations from the field its hard to get a good handle on possible persistent weak layers. I stress the importance to dig down and become familiar with the snowpack in your neck of the woods. Look for, and test potential weak layers. Observe their reactivity before dropping into your run or line.The average snowpack depth at treeline is near 100 cm but remains quite inconsistent across the region. A strong mid-pack currently overlies a weak base layer of facets/depth hoar. Triggering of this basal weakness may still be possible from thin spots, rocky outcrops or under the weight of larger triggers such as cornice fall and larger amounts of new storm snow.

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