Boletín de aludes

Kootenay Boundary

Feb 23 – 24, 2014Avalanche Canada
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Archivado · caducó 13 years ago

Peligro de aludes

Tue
Wed
Alta montaña
4 · Fuerte
Límite del bosque
3 · Notable
Bajo el límite
3 · Notable
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Lo esencial

Don't let the improving weather lure you into high risk scenarios. Check out the Forecasters Blog post for the Kootenay Boundary.The hazard will increase on the first day of full sun.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–4
    Wind has transported snow and built fresh, touchy wind slabs. Be aware of weak cornices looming over slopes. If they fail, they will likely trigger a large slab avalanche on the slope below.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    3–6
    Expect the deeply buried weak layers to continue to produce large and destructive avalanches. Slopes are primed for human triggering and remain a concern on all aspects and elevations.

Confidence

Fair - Timing or intensity of solar radiation is uncertain

Weather Forecast

The high off the north coast will continue to push modified arctic air across the region. Some unstable disturbances are embedded in this flow, bringing scattered cloud along the southern boundary of the region. Most other locations further north will see sun. Monday: Mix of sun and cloud. Treeline temperatures near -8.0. Ridgetop winds light from the north.Tuesday: Sunny. Treeline temperatures near -3.0. Ridgetop winds light from the northeast.Wednesday: Mostly sunny. Treeline temperatures -2.0. Ridgetop winds light from the west. Freezing levels rising to 1200 m.

Avalanche Summary

On Sunday, a skier triggered size 2.5 was reported. Party of three with two involved, no burials. The crown was near 100 cm deep and released near ridgetop in storm snow and then stepping down to the persistent weak interface. Remote triggering and long fracture propagations are occurring on all aspects and elevations. With forecast sun, the avalanche hazard will likely increase on solar slopes.Check out the Forcaster Blog! It shows a photo of a remote triggered size 3 last Friday in the southern part of the Kootenay-Boundary.

Snowpack Summary

Moderate SW winds have loaded leeward and cross-loaded exposed slopes. Changing winds from the north may build fresh wind slabs on southerly slopes. There is over a metre of recent storm snow that is sitting on a weak layer that is a mixture of facets, surface hoar, melt-freeze crusts and any combination of these. The weak layer is widespread at all elevations and aspects and continued whumpfing and avalanche activity is reported. The storm slab continues to settle and become more cohesive allowing for longer fracture propagations and remote triggering from up to 200 m away, yikes! This persistent weak layer is expected to be a concern for some time; at all elevations and aspects. Treeline and below treeline is catching a lot of people by surprise. With forecast sunny periods, solar aspects will likely become more reactive.

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