Avalanche forecast

Banff Yoho Kootenay

Nov 11 – 12, 2019Parks Canada
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Archived · expired 7 years ago

Avalanche danger

Tue
Wed
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
1 · Low

Highlights

There is lots of fresh powder to enjoy, but recent winds will have created fresh wind slabs. A cautious approach to open terrain at and above tree line is needed.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely - Very Likely
    Size
    1–2.5

    There is lots of fresh snow available for transport and winds are forecasted to be in the mod to strong range on Monday. Fresh and reactive wind slabs can be expected.

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2.5

    A thin crust formed in Oct. with facets exists in the lower snowpack. Smaller wind slabs could step down to this deeper layer.

  • Loose Dry

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1–1.5

    This problem will be most prevalent in gullies and confined terrain at and above treeline.

Weather Forecast

No new snow forecasted for Monday, but winds are expected to pick up from the west into the moderate to strong range at ridgetops. Light snow will begin again on Tuesday.

Snowpack Summary

15-30 cm of storm snow at tree-line sits over top of a rain crust (below 2300m). Strong winds forecasted for Monday will create fresh wind-slabs in the alpine and down into tree-line. The thin October crust and facets in the lower snowpack have been found up to about 2300m. Tree-line snow depths range from 60-80 cm deep (up to 110 cm in lee areas).

Avalanche Summary

Lake Louise ski hill reported widespread natural cycle in storm snow up to size 1.5. Several size 2.5 slabs observed in Yoho that originated near ridge-top and ran to top of track.

Confidence

Regions covered