Bulletin d’avalanche

South Columbia

Apr 13 – 14, 2013Avalanche Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

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

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–6
    A layer of surface hoar is buried about a metre down, mainly on high northerly aspects. A surface avalanche stepping down, cornice fall, or the weight of a person from a thin-spot trigger point could trigger it.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–4
    Snowfall on Friday night and variable winds have created new storm slabs, especially near ridge top and on slopes in the lee of the wind.

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

Sunday: Very light snowfall / Light northeast winds / Freezing level at 1400mMonday: Mix of sun and clouds / Light east winds / Freezing level at 1400mTuesday: Mix of sun and cloud / Calm winds / Freezing level at 1600m

Avalanche Summary

Observations are becoming more limited; however a size 2 natural wind slab avalanche was observed on a lee alpine feature on Friday. A size 2 slab was also ski cut on a steep southeast facing convex roll. Surface hoar was the suspected interface.I would expect ongoing storm instabilities in the wake of new snow and wind on Friday night.

Snowpack Summary

Moderate to locally heavy snowfall on Friday night has created touchy new storm/wind slabs, especially near ridge top. This will add to existing storm slab and wind slab problems at alpine and treeline elevations. A surface hoar interface is buried within the upper metre or so of the snowpack, mainly on high-elevation northerly aspects. It may be slowly gaining some strength, but these slopes should still be treated with suspicion. On other slopes, recent storm snow overlies a crust, with a variable bond. At low elevations, moderate accumulations overlie previously rain-soaked snow which is now refrozen and strong.Recent wind and snow has added to the size and fragility of large cornices.

Régions couvertes