Boletín de aludes

Banff Yoho Kootenay

Feb 6 – 7, 2018Parks Canada
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Archivado · caducó 9 years ago

Peligro de aludes

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

Conditions are touchy right now. Somewhere between High and Considerable and forecasters are debating which category they fall into. Regardless, it is a good time to stay out of avalanche terrain!

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely - Very Likely
    Tamaño
    2–3.5
    Three weak layers exist in the upper snowpack: Jan 16, Jan 6, and Dec 15. All are a mix of sun crust, surface hoar and facets depending on the aspect and elevation. 50-100 cm of snow over the last week has overloaded these layers.

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–2
    20-40cm of storm snow (and wind) has developed a slab at higher elevations. If triggered this layer has the potential to step down to deeper instabilities. Continue to make conservative route choices.

Weather Forecast

Tuesday should be mostly clear with light winds. The next storm is moving in Wednesday/ Thursday with 20-30 cm 's of snow, rising temps and strong west winds. We expect the danger to rise significantly at that time.

Snowpack Summary

20 - 30 cm of low density snow with little wind sits on the surface. The main concern in the snowpack lurks below and continues to be the 3 persistent weak layers of surface hoar and/or facets that are found between 50 and 100cm down. We continue to observe sudden test results, whumphing and large propagations on these layers.

Avalanche Summary

Forecasters remote triggered a size 2.5 today on the Icefields Parkway. They triggered it from ~ 50m away on a low angle ridge. The slide was ~ 300m wide, 80 cm deep and slid on a well preserved surface hoar layer (Jan. 6th). A solo skiier in the Lake Louise backcountry had a very close call today when he triggered a size 2 and was partially buried

Confidence

Intensity of incoming weather systems is uncertain on Wednesday

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