Bulletin d’avalanche

Kootenay Boundary

Feb 19 – 20, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
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
    Taille
    1–4
    Generally light but locally gusty winds may have loaded or cross-loaded exposed slopes on a potentially weak interface. Recent winds have blown from the east, making loading on unusual aspects possible.

Confidence

Good

Weather Forecast

Synopsis: Relatively benign weather is anticipated until Friday afternoon, when a frontal system is expected to bring moderate precipitation.Wednesday: Flurries possible, also some clear breaks. Calm or light westerly winds. Freezing level around 800 m in the afternoon.Thursday: Light snowfall, 2-5 cm. Light southwesterly winds. Freezing level around 600 m.Friday: Moderate snowfall. Southwesterly winds 30-50 km/h. Freezing level around 900 m.

Avalanche Summary

Loose snow avalanches have been reported in steep terrain.

Snowpack Summary

10-20 cm of recent snow (more like 30 cm in Kokanee Glacier Park) overlies a layer of surface hoar buried around Feb 12. This burial depth is still shallow, and for the most part the snow above is still light. However, there may be isolated slopes where the wind has blown the new snow into wind-stiffened deposits sufficiently deep to create a potentially harmful slide. Additionally, the well-developed crystals associated with this weak layer indicate it is likely to stay with us for a while and present bigger problems as it becomes more deeply buried. Two previous buried surface hoar/facet/sun crust layers 30 and 50 cm below the surface (Feb 4th and Jan 23, respectively) are still being tracked by professionals but have not been reactive recently. These layers may be worth investigating on a safe, representative adjacent slope if you are considering riding in aggressive terrain.

Régions couvertes