Boletín de aludes

Banff Yoho Kootenay

Jan 17 – 18, 2018Parks Canada
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Archivado · caducó 9 years ago

Peligro de aludes

Thu
Fri
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Lo esencial

Two days of avalanche control has produced mixed results. Most areas in Banff, Yoho and Kootenay produced only a few avalanches to size 2. However, down in Little Yoho we triggered several large size 3s that blew over the climbs and covered the road.

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–3
    This layer continues to be the cause of much uncertainty with forecasters - we think its bad, but yet it has not yet produced many large avalanches. We remain uneasy about it despite indications of generally good conditions.

Weather Forecast

The ridge of high pressure is breaking down and a Pacific storm will cross the region starting Wednesday afternoon. Wednesday itself will be colder (-4 to -10) with winds picking up from the west and snow starting in the afternoon. Expect up to 15 cm by the end of the storm on Thursday afternoon.

Snowpack Summary

Recent warm temperatures aloft have settled the upper snowpack and formed suncrust on S and W aspects. 30-50cm of snow sits over the Dec.15 persistent weak layer of facets and surface hoar. The overlying slab propagation is extremely variable across the region with stability of the snow being specific to each slope.

Avalanche Summary

Two days of avalanche control has produced smaller results than expected in all areas except near Field. Bourgeau, Whymper, Simpson and Bosworth each produced a few avalanches up to size 2 failing on the Dec 15 facet layers, but the results were not as widespread as anticipated. Mt. Dennis ice climbs in Field produced large avalanches up to size 3.

Confidence

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