Avalanche forecast

Jasper

Nov 20 – 21, 2020
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Avalanche danger

Sat
Sun
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
1 · Low
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Highlights

Skiing, ice climbing and avalanche season is upon us. Please report conditions to the MIN. https://www.avalanche.ca/mountain-information-network/

Avalanche problems

  • Wind Slabs

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

    Up to 20cm of new snow with moderate winds at ridge top may have produced windslabs in the immediate lee at ridge tops.

  • Persistent Slabs

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

    Pockets of previous wind deposited snow overlies the Nov 4 rain crust and continues to be reactive to skier traffic and large loads such as explosives.

  • Loose Dry

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

    Cool temps, winds and recent snowfall promoting loose dry avalanches in steep terrain.

Weather Forecast

Parkers Weather Forecast

Overnight: Cloudy with clear periods and isolated flurries. Low -13. Wind light SW.

Friday: Cloudy with sunny periods and isolated flurries. High -12. Wind light SW.

Saturday: Cloudy with sunny periods. Low -13 C, High -10 C. Wind light SW

Snowpack Summary

Up to 20cm of new snow in the past 24 hours. This overlies a new rain crust from Nov 17. The snowpack is 55-85cm at treeline. The Nov. 4th rain crust exists up to 2600m depending on location, and is up to 50cm deep. Now buried, wind slabs in exposed terrain that sit on the Nov 4th crust recently continue to be reactive to large loads.

Avalanche Summary

On Monday a size 2 skier triggered wind slab avalanche above the Hilda Hostel at Parker Ridge failed down 70cm sending blocks of concrete like snow into the trees. Recent report of a size 2 skier triggered wind slab in the alpine on a east aspect wind loaded feature.

Confidence

Due to the number and quality of field observations

Regions covered