Bulletin d’avalanche

Northwest Coastal

Dec 26 – 27, 2012Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    Wind slabs have formed in response to down-valley winds. These could be triggered by the weight of a person or snowmobile.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–7
    A deeply buried weakness may be triggered from thin, rocky snowpack areas or with a large trigger.

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain on Thursday

Weather Forecast

Thursday: Light SW winds. Alpine temp -7. Light snow(around 10 cm). Friday: Moderate SW winds. Alpine temp around -6. Moderate snow.Saturday: Light to moderate SW winds. Freezing level at valley bottom. Very light snow.

Avalanche Summary

A skier triggered a small hard wind slab on a steep north-facing roll near treeline on Tuesday. Natural size 1-2 avalanches were failing in response to outflow wind-loading over the past few days.

Snowpack Summary

Wind slabs and cornices have developed on a fairly widespread basis and may be found on many slopes due to variable wind directions. Some alpine slopes are heavily scoured. Surface faceting is likely to continue while the weather remains cold. A layer of surface hoar buried in the upper metre of the pack has been observed in the Shames backcountry. The mid-pack is generally well settled. Near the base of the snowpack, a crust/facet layer has recently given hard, sudden results in snowpack tests. This weakness is unlikely to be triggered by a single person, but it remains possible with a very heavy load (e.g. cornice fall) or from a thin-spot trigger point.

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