Avalanche forecast

Banff Yoho Kootenay

Mar 12 – 14, 2012Parks Canada
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Archived · expired 15 years ago

Avalanche danger

Wed
Thu
Alpine
4 · High
Treeline
4 · High
Below
3 · Considerable
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Highlights

Up to 25cm of snow is expected overnight and into tomorrow morning. The additional load will push the danger rating to HIGH. Be vigilant and observant tomorrow. Expect to see natural avalanches occurring.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2
    The expected snow and associated wind throughout Monday night will produce wind-slabs up to 30cm deep in lee areas at high elevations.

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    2–4
    A slab overlies the Feb 14 surface hoar down 60-100 cm. This layer will be loaded with up to 25cm of storm snow by Tuesday afternoon. Expect natural activity and an increased potential for human triggering.

  • Deep Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    2–4
    Slabs starting on the Feb 14 layer can step down, triggering deep slabs. When triggered, these large and destructive avalanches will slide on basal facets close to the ground. Fracture lines could be up to 200cm deep with wide propagations.

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Forecast snowfall amounts are uncertain on Tuesday

Regions covered