Bulletin d’avalanche

Northwest Inland

Mar 16 – 17, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Mon
Tue
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–5
    Cornices are well developed. They are likely to be most sensitive when exposed to daytime heating or solar radiation.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–5
    Recent new snow has consolidated into a slab and is reacting to human triggers. The primary weak layer comprises surface hoar and appears to be touchy.

Confidence

Fair - Timing or intensity of solar radiation is uncertain

Weather Forecast

Synopsis: Northwest flow with limited moisture will bring cooler temps and a chance of flurries through the period.Sunday and Monday: Chance of flurries, with significant breaks in the cloud giving daytime warming both days. Afternoon freezing level around 500 m. Winds light northwesterly.Tuesday: Dry during the day, becoming increasingly cloudy through the day. Freezing level 200 m. Winds light southerly.

Avalanche Summary

On Friday, a size 2 remote-triggered avalanche was reported from a west aspect at 1450 m, likely failing on the March 9th surface hoar layer down around 50 cm. Another human-triggered avalanche was reported from a north aspect slope.

Snowpack Summary

20-40 cm of recent storm snow rests on a variety of old snow surfaces, including crusts, previous wind slabs and surface hoar (buried March 9th). Warmer temperatures and recent winds have now set this new snow into a reactive slab. The March 9th surface hoar layer is reported to be very touchy and appears to exist at all elevations and on a variety of aspects. I suspect cornices have become well-developed and could easily become unstable with daytime heating. The mid snowpack is generally well settled and strong.

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