Bulletin d’avalanche

South Rockies

Dec 10 – 11, 2012Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
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 - Likely
    Taille
    1–4
    Wind slabs are likely to be found on alpine slopes and behind ridges and ribs at treeline and below.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–6
    A release on this early season rain crust could be surprisingly large and destructive.

Confidence

Poor - Due to limited field observations

Weather Forecast

Monday night: Expect winds of up to 70 km/h from the W and light snow overnight. Alpine temp -10.Tuesday: Strong to gale W winds. Alpine temp -10. Light snow. Freezing level 900 m, dropping to surface overnight.Wednesday: Light winds. Alpine temp -9. Freezing level around 1000 m. Light to moderate snow.Thursday: Light to moderate SW winds. Alpine temp -13. Freezing level 400 m. No snow.

Avalanche Summary

Numerous size 1 sluffs and shallow natural wind slabs were observed on Sunday in the southern Elk Valley.

Snowpack Summary

Recent dry snow has been transported by strong NW winds, creating wind slabs in some areas. Loose snow spilling onto fans has created localized loading. A buried rain crust extends to about 1800 -2000 m. A layer of surface hoar buried about 1 m down seems most prevalent on the west side of the region. At the base of the snowpack an early November crust/facet layer remains a concern. Recent tests have shown sudden results at this interface. In general, snowpack observations are sparse in this region and significant variations are likely to exist from one drainage to another. Digging down and making your own observations will be critical to safe slope selection. Any observations from the field are welcome at [email protected].

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