Avalanche forecast

Jasper

Dec 9 – 10, 2020
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Archived · expired 6 years ago

Avalanche danger

Thu
Fri
Alpine
3 · Considerable
Treeline
3 · Considerable
Below
2 · Moderate

Highlights

The Icefields Parkway is closed, with an estimated opening of 1200 Dec. 10th.

Avalanche problems

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–3.5

    The Nov. 4 crust is down up to 90cm at tree line (2000m) and breaking down. Storm slabs may step down to this layer or even deeper to the basal instability creating large destructive avalanches.

  • Loose Dry

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

  • Storm Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible - Likely
    Size
    1–2

    Recent HST is being distributed and forming wind slabs in the ALP and open TL.

Weather Forecast

10cm of snow is expected overnight. Cooler temperatures and clear skies are forecasted for the remainder of the week.

Snowpack Summary

Up to 50cm of new snow in the past 24h with moderate SW winds has resulted in new winds slabs in ALP lee features and widespread storm slabs. These overlie a variety of previous surfaces including hard slabs in the ALP and open TL, facets and isolated surface hoar at TL and BTL, and solar crust on steep solar aspects.

Avalanche Summary

Numerous loose dry and slab avalanches up to size 2 at all elevations and aspects.

Confidence

Regions covered