Avalanche forecast

Banff Yoho Kootenay

Dec 9 – 10, 2011Parks Canada
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Avalanche danger

Fri
Sat
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
2 · Moderate
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Highlights

The snowpack is starting to bridge the weak base of depth hoar over crust, but human triggering in steep terrain is still likely. Warming over the weekend may create an inversion with near zero temperatures in the alpine.JBW

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    2–3
    Wind effect in the alpine and at treeline has created a hard slab on most lee slopes. This slab can be triggered from the edges or thin spots and will likely immediately step down to the weak base of depth hoar.

  • Deep Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    2–3
    The weak base of depth hoar and facets is now less sensitive to human triggering , however skier triggered and natural avalanches have recently been observed on this layer. A natural with a 400 m crown was observed on Mt Lefroy yesterday.

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Regions covered