Bollettino valanghe

Kootenay Boundary

Mar 27 – 28, 2012Avalanche Canada
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Archiviato · scaduto 15 years ago

Pericolo valanghe

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

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–4
    The increased wind and new snow are forming new windslabs in lee zones at ridgecrest. These overlie a slick melt freeze crust in most locations and small surface hoar on North aspects.

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    2–6
    Cornices are very large and will grow under the current conditions. There is potential for triggering deep slabs on underlying slopes.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    3–8
    Triggerable from shallow areas or with a large event like a cornice fall or step down avalanche.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Wednesday: Expect flurries through the day, with southwest winds increasing to 30-50km/h. Freezing levels could reach 1800m. 15cm of snow is possible. Thursday / Friday: A series of fast-moving systems will pass through, giving short, intense flurries under moderate to strong southwest winds. Freezing levels should reach 1500m each afternoon. The most vigorous pulse is expected Thursday afternoon with 20cm possible.

Avalanche Summary

Natural and explosive triggered avalanches have been reported up to size 2.0, with the new storm snow failing on the March 26 melt freeze crust.

Snowpack Summary

The recent warm, clear weather has left us with an aggressive melt freeze crust on solar aspects well into the alpine while shady, dead north slopes have grown small surface hoar and remain powdery. In some areas up to 25cm of new snow now overlies these surfaces. New windslabs are forming at ridgecrest under the increased winds. Large cornices loom in the alpine. In recent snowpack tests, the early February surface hoar remains well preserved down 100-180cm and continues to yield sudden results. Although unlikely, triggering this layer would yield a very large, destructive avalanche.

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