Bollettino valanghe

Cariboos

Jan 16 – 17, 2013Avalanche Canada
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Archiviato · scaduto 14 years ago

Pericolo valanghe

Fri
Sat
Alta quota
3 · Marcato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
Apri la mappa completa

In sintesi

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely - Very Likely
    Dimensione
    1–4
    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 deeper instabilities.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–5
    Persistent weaknesses are buried at a prime depth for human triggering. Triggering persistent slabs is most likely on south-facing slopes and in sheltered terrain below treeline.

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

Thursday: Moderate to strong W winds. Alpine temperature near -2. Trace of snow.Friday: Light to moderate NW winds. Alpine temperature near -11. No snow.Saturday: Light SW winds. Alpine temperature near -3. 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.

Snowpack Summary

Strong north to north-westerly winds have left wind slabs in many areas, even at treeline. 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. 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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