Boletín de aludes

Purcells

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 - Likely
    Tamaño
    1–5
    Wind slabs may be found behind terrain breaks such as ridges and ribs. It may be possible for a wind slab to step down to a deeper instability.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–6
    Triggering persistent slabs is becoming less likely, but a cautious approach is still advised. Take extra care on steep south-facing alpine slopes and in sheltered terrain below treeline.

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

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

Avalanche Summary

A couple of slabs (size 1 and 2.5) failed naturally on NW aspects at around 2400 m on Thursday.

Snowpack Summary

Ongoing strong to extreme NW to SW winds have stripped windward aspects and left wind slabs on many lee slopes, even below treeline. Around 40-60 cm settled storm snow sits above surface hoar (found especially at and 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. Test results on these interfaces vary from no result to moderate, sudden results. 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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