Avalanche forecast

Jasper

Apr 20 – 21, 2021
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Avalanche danger

Thu
Fri
Alpine
No rating
Treeline
No rating
Below
No rating

Highlights

Wednesday will be another warm day with freezing levels to 2500m. Start early and end early to avoid the heat of the heat of the day and rising avalanche danger.

Avalanche problems

  • Cornices

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely - Possible
    Size
    1.5–3.5

    Cornices are awake! These features are large, dense and heavy and will possibly trigger the deeper instability on the slope below. If you must travel near or below cornices, use good travel techniques and group management to reduce exposure.

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1.5–3

    Shallow snowpack areas in the alpine have increased potential for human triggered and natural avalanches stepping to deeper layers.

  • Loose Wet

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

    Start early to avoid this avalanche problem. Avoid steep, treed TL and BTL terrain in the heat of day; even cutting out a small wet slide can push you into a terrain trap.

Avalanche Summary

A slower warming tread forecast through this week should allow for the snowpack to adjust. Sunny, exposed TL and BTL terrain rapidly losing coverage and the overall snowpack structure is weak and will collapse with very little load.

Confidence

Weather Forecast

Wednesday: A mix of sun and cloud with isolated flurries. Precipitation: Trace. Alpine temperature: High 2 C. Ridge wind W: 15-30 km/h. Freezing level: 2400 metres.

Thursday: Cloudy with sunny periods and isolated flurries. Precipitation: Trace. Alpine temperature: Low -13 C, High -6 C. Ridge wind NE: 10-30 km/h. Freezing level at valley bottom.

Snowpack Summary

Cold nights, helping the snowpack recovery and creating a supportive melt/freeze crust on all aspects and elevations. This crust will break down over the day, except above ~2500m where the snow is likely to remained dry for the near future. Weak faceted crystals at the bottom of the snowpack could be concern in shallow alpine snowpacks.

Regions covered