Boletín de aludes

South Rockies

Dec 1 – 2, 2014Avalanche Canada
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Archivado · caducó 12 years ago

Peligro de aludes

Wed
Thu
Alta montaña
3 · Notable
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Lo esencial

What did you see over the weekend? We welcome your observations. Email forecaster@ avalanche.ca.

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–6
    A touchy weak layer is now buried a metre or so down in the snowpack. It may be reactive to the weight of new snow, wind-loading or the additional weight of a skier or sledder. Avalanches on this layer could be surprisingly large.

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–3
    Recent snow and wind may have left slabs on a variety of slopes. Watch for breakable or stiff-feeling snow, or smooth, bulbous-looking slopes. These may indicate wind slabs.

Confidence

Poor - Due to the number of field observations

Weather Forecast

Synopsis: Fairly static weather pattern, the arctic high pressure centre persists over Southeastern BC for the next few days. The models suggest that cloud and precipitation will push into the southern half of the province Thursday night/Friday. Tuesday: Freezing Level: Valley Bottom; Precipitation: Nil; Wind: Treeline: Moderate, W/SW | Ridgetop: Strong, NWWednesday: Freezing Level: Valley Bottom; Precipitation: Nil; Wind: Treeline: Light, SW | Ridgetop: Moderate WThursday: Freezing Level: Valley Bottom; Precipitation: Nil; Wind: Treeline: Moderate, SW | Ridgetop: Moderate, W

Avalanche Summary

Explosives triggered two very large (size 2.5 and 3.5) slabs in the south of the region on Thursday around treeline. These failed on a weak layer of facets buried about a week ago. We haven't had any newer reports, but I'd expect some further avalanche activity to occur this weekend in response to the recent snow and wind, with the chance of triggering a deeper weakness and creating a very large event.

Snowpack Summary

As we begin our forecasting season, we are working with very limited field data. If you have been out in the mountains, we'd love to hear from you. Please email us at [email protected].Half a metre or so of recent snow is likely to have been redistributed by wind into fresh slabs on lee slopes. Natural avalanches may continue spilling down steep headwalls for a day or two. A weak layer (of facets over a crust) which formed during November's dry spell is now buried a metre or more down. Avalanches failing on this layer have the potential to propagate widely, leading to very large events.

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