Bulletin d’avalanche

Kootenay Boundary

Apr 4 – 5, 2014Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

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

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Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    The new snow may not be well bonded to the old crust in areas that had surface hoar before the snow arrived. Southwest winds may have developed pockets of wind slab on lee slopes during the storm.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    3–6
    Avalanches releasing on the deeply buried weak layer from early February are still a concern. Strong solar radiation, cornice falls, new loading, or storm slab avalanches in motion are all possible triggers.

Confidence

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

Weather Forecast

Overnight and Saturday: Freezing level dropping briefly below 1500 metres and then rising up to 1800 metres in the afternoon. Southwest winds becoming strong in the afternoon as moderate precipitation begins to fall.Sunday: 5-10 cm is expected by morning before the ridge of high pressure moves into the region bringing broken skies and freezing levels rising to 2000 metres. Winds becoming strong Westerly.Monday: Freezing level remaining above 2000 metres overnight and rising up to 2500 metres. Broken skies with periods of strong solar radiation.

Avalanche Summary

No new avalanches reported.

Snowpack Summary

There is 5-10 cm of new snow that developed a new storm slab. The new thin storm slab is sitting on a 2-5 cm melt-freeze crust that developed over the past few days on all but shaded North aspects in the alpine. This crust has been reported to be "knife" resistance in some parts of the region and may have a layer of surface hoar below the new storm snow. There is now about 75 cm of well compacted snow above the March 10th melt-freeze crust. In some areas the March 10th crust is helping to bridge over the deeply buried late January/early February persistent weak layer. The Jan/Feb deep persistent weak layer continues to be a concern for very large destructive avalanches. Releases on this layer may be more likely during periods of strong solar radiation and/or prolonged warm temperatures at alpine elevations.

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