Boletín de aludes

Purcells

Jan 21 – 22, 2016Avalanche Canada
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Archivado · caducó 11 years ago

Peligro de aludes

Sat
Sun
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Lo esencial

Weather on Friday looks quite variable across the Purcells. In the south and west, increased loading from snow and wind could drive danger ratings higher than posted.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–4
    Wind slabs are building on lee features. These may be extra-reactive where they overlie buried surface hoar.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–4
    With each successive snowfall, a slab is gradually forming above a touchy buried weakness. This could be triggered by the weight of a person, even from a distance.

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

Friday brings another 5-15 cm snow, moderate SW winds and freezing levels around 1500 m. Through the weekend, expect mainly light winds, cool temperatures, cloudy skies and a few flurries.For more details check out https://avalanche.ca/weather.

Avalanche Summary

On Wednesday, explosives triggered three size 2 wind slabs. On Tuesday, skiers who ventured onto a steep alpine feature in a permanently closed area within a ski area triggered a size 1.5 wind slab.On Monday, several small slabs were triggered by skiers, including three that were remotely triggered. These were either on wind-loaded features at and above treeline, or in openings at low elevations, where buried surface hoar is largest and most reactive. Snow and wind this week could overload the persistent weak layer in some parts of the region.

Snowpack Summary

Conditions are variable across the Purcells. New wind slabs are developing at treeline and alpine elevations. In some areas, these overlie a surface hoar or crust interface and may be extra touchy. The persistent weak layer from early January is around 20-40 cm down and has not yet reached tipping point in many parts of the region. With warming, snow and wind forecast on Friday, a consolidated persistent slab could form. Operators are also still keeping an eye on a more deeply buried layer of surface hoar from December, which is now considered dormant or unreactive. In general, the mid and lower snowpack are well settled and strong.

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