Boletín de aludes

Cariboos

Jan 18 – 19, 2013Avalanche Canada
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Archivado · caducó 14 years ago

Peligro de aludes

Sun
Mon
Alta montaña
2 · Moderado
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
    Tamaño
    1–4
    Wind slabs may be found behind terrain breaks such as ridges and ribs.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–5
    Triggering persistent slabs is becoming less likely, but a cautious approach is still advised. Carefully assess steep south-facing slopes and slopes below about 1900 m, where persistent weaknesses are most likely to be lurking.

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

Saturday: Moderate to strong W winds. Alpine temperature near -3. Light snow possible.Sunday: Light to moderate W winds. Alpine temperature near -2. No snow.Monday: Light SW winds. Alpine temperature near -2. No snow.

Avalanche Summary

Several naturally-triggered size 1 wind slabs were observed on Tuesday. A skier also triggered a size 1.5 slab on a north aspect at 1300 m, which failed on buried surface hoar. No avalanches have been reported since then.

Snowpack Summary

Recent strong north to north-westerly winds have left wind slabs in many areas, even at treeline. These are likely to be gaining strength as time goes on and the amount of snow available for transport diminishes. Settled storm snow sits above surface hoar (found especially below treeline in sheltered areas), a sun crust (on steep S to SW -facing slopes) and facets. The distribution of these weaknesses is patchy, but where they exist, it may still be possible to trigger a large avalanche with the weight of a person or snowmobile. A strong mid-pack overlies a weak facet/crust layer near the base of the snowpack, which is now considered inactive.

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