Boletín de aludes

South Columbia

Mar 13, 2017Avalanche Canada
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Archivado · caducó 10 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

Snow, wind and warming are a recipe for elevated danger. Storm and wind slabs will be touchy at treeline and above. Avoid overhead hazard: Conservative terrain use is essential this week!

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–4
    Various persistent weaknesses strewn throughout the snowpack create the potential for large step-down avalanches. Warming is expected to increase the likelihood of these large avalanches, especially with cornice-fall triggers.

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–3
    Weaknesses within the recent storm snow are susceptible to human triggering. These storm slabs are particularly deep and touchy on slopes loaded by southerly winds and have the potential to step down to deeper persistent weaknesses.

Confidence

Low - Intensity of incoming weather systems is uncertain

Weather Forecast

We'll have moderate snowfall amounts through to Monday afternoon, and then it starts to warm up.MONDAY: Cloudy with another 15-20cm by late afternoon accompanied by moderate to strong SW winds and freezing levels rising as high as 1500m.TUESDAY: Scattered flurries (3-5cm) with moderate southerly winds. Freezing levels remain near 1600m.WEDNESDAY: Cloudy with another 10-20cm of fresh snow throughout the day accompanied by moderate SW winds. Alpine temperatures hovering around -2 C.

Avalanche Summary

On Sunday we had reports of a widespread natural avalanche cycle up to Size 3 on all aspects and elevations at treeline and in the alpine.

Snowpack Summary

Around 40-60cm of fresh snow has fallen over the past three days (with light to moderate southerly winds) and has added to the 50-100cm of settled storm snow from the past week. Touchy storm slabs can be found at all elevations with weaknesses within and under this recent snow.All this new snow is bonding slowly to faceted snow as well as isolated small surface hoar in sheltered areas and a thin sun crust on steep southerly aspects.The persistent weakness buried mid-February is now down 80-140 cm, and is composed of a thick rain crust as high as about 1800 m, sun crusts on steep southerly aspects, and spotty surface hoar on shaded aspects. Recent reports show the bond to this interface becoming more variable.The mid and lower snowpack are well settled and stable in deeper snowpack areas, but may be weak and faceted in shallow areas.

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