Bulletin d’avalanche

Kootenay Boundary

Feb 16 – 17, 2013Avalanche Canada
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Archivé · expiré 14 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

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    Strong winds have loaded lee features on a potentially weak interface.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    A reactive weak layer is lightly buried in the upper slab. As more snow arrives, I expect this will become a focus for avalanche activity, especially on unsupported (convex) terrain features.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Synopsis: A short-lived ridge of high pressure on Sunday is replaced by a weak low pressure system for Monday.Sunday: Dry with a mix of sun and cloud. Winds light northwesterly. Freezing level around 900 m.Monday: Flurries. Winds light westerly. Freezing level around 900 m.Tuesday: Dry. Cloudy. Calm. Freezing level around 900 m.

Avalanche Summary

Small loose snow avalanches were reported on south facing slopes during recent warm weather.

Snowpack Summary

5-15 cm of recent snowfall (possibly a little more near Kokanee Glacier Park) overlies a recent layer of surface hoar buried around Feb 12. We have had some reports this layer contains crystals up to 30mm in some locations. This large size of crystal increases the likelihood this layer will present problems as it becomes more deeply buried. Wind slabs are widespread in exposed areas. Two previous buried surface hoar/facet/sun crust layers from Feb 4th and Jan 23 are still being tracked by professionals but have not been reactive recently. They can be found approximately 30 cm and 50 cm below the surface, respectively. These layers may be worth investigating on a safe but representative adjacent slope if you are considering riding in aggressive terrain.

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