Boletín de aludes

Kananaskis

Jan 19 – 20, 2019Alberta Parks
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Archivado · caducó 8 years ago

Peligro de aludes

Mon
Tue
Alta montaña
3 · Notable
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Lo esencial

Full depth skier triggered avalanche are a real possibility. Avoid thin terrain where the snowpack is weak.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–2.5
    Expect to find wind slabs at all elevations. The depth and sensitivity to triggering are highly variable across the forecast region.

  • Loose Dry

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Very Likely
    Tamaño
    1–1.5
    Extensive sluffing from steeper terrain was observed flowing into skiable areas.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1.5–3
    Full depth avalanches failing on ground have been observed over the past few days. Thin areas where you may trigger the basal layers should be avoided.  Test also indicate that propagation across a feature is likely

Confidence

High -

Weather Forecast

Another 5cm of snow is forecast overnight with temps on Sunday looking to be slightly cooler around -10C.  Winds are forecast to be light out of the SW under a partly cloudy sky.  Dribs and drabs of snow are forecast this week but no significant accumulations.

Avalanche Summary

Numerous loose dry slides out of steeper terrain up to sz 1.5.  Besides this, no new slab activity was observed.

Snowpack Summary

5-10cm of new snow over the past 48hrs at treeline and above.  This snow is now burying the Jan 17th surface hoar and sun crust layers that were being found up to 2300m. This will be important to note later as the winter continues.  Otherwise our main concern is still for the weak basal layers under the Dec 10th interface down 80-110cm.  Thin areas we were able to get easy results and the tests also indicate that this layer will likely propagate across a given terrain feature given the widespread nature of the basal problem.  We backed off steeper terrain on Saturday due to variable snowpack depths and are still very cautious in and under bigger terrain.  Sheltered areas were offering some good skiing!

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