Bulletin d’avalanche

South Rockies

Dec 17 – 18, 2014Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

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

If the riding is good, the snowpack stability might not be.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    2–4
    Old facet/crust weaknesses may still be sensitive to triggers on slopes that aren't bridged by a thick near-surface crust. Generally shady aspects in the high alpine.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Dry surface snow is poorly bonded to the underlying hard crust and may sluff off in steep terrain.

Confidence

Fair - Due to the number of field observations

Weather Forecast

A mix of sun and cloud and no snow expected for Thursday and Friday with some very light flurries possible Friday afternoon into Saturday morning. Freezing levels reaching 1600 each day and winds remaining light but gusty from the southwest.

Avalanche Summary

No new reports of avalanches from the region on Tuesday or Wednesday morning.

Snowpack Summary

Surface hoar is likely growing on 10-20 cm of loose dry snow that is sluffing readily on a thick hard supportive rain crust that extends into alpine elevations. This near surface crust is effectively bridging triggers from penetrating to deeper persistent weaknesses that formed earlier in the season. However, on slopes above the recent rain line poorly bonded crusts, facets, and/or buried surface hoar may be susceptible to triggers. Including a weak layer of crust and/or facets that is now down between 70-100 cm. This buried crust from November may continue to be triggered by large additional loads. Pockets of fresh wind slab may also be triggered at or near ridgetops in areas where the snow was dry enough to be transported by the strong Southwest winds during the storm.

Régions couvertes