Avalanche forecast

Jasper

Mar 19 – 20, 2021
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Archived · expired 6 years ago

Avalanche danger

Sun
Mon
Alpine
2 · Moderate
Treeline
1 · Low
Below
1 · Low
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Highlights

With cooling trend and small amounts of precipitation in the forecast we are facing generally safe avalanche conditions.Be mindful of the potential for low probability high consequence scenario.

Avalanche problems

  • Cornices

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

    Cornices can be extremely destructive alone or, may initiate deeper layers in the snowpack below.

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely - Possible
    Size
    1–3

    More activity noted at this layer, mostly initiated by large loads (cornices) in steep terrain.

  • Loose Wet

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

    Varied sensitivity on solar aspects, likelihood increases on the steepest slopes. It may be possible to trigger deeper instabilities once initiated.

Snowpack Summary

Up to 5cm of new snow becoming moist on solar aspects and creating thin slabs in ALP lees. Warm temps and high solar input have created sun crust on solar aspects TL and below. Snowpack becoming isothermal 1700m and below on all aspects. Generally strong mid-pack with exception in shallow areas.

Avalanche Summary

No new avalanche activity observed or reported today, however, there have been reports of sporadic large avalanches in isolated ALP features in the last couple weeks. These slides are believed to be triggered by large cornice failures and ran in heavily wind loaded features with wide propagation. Beware of low probability, high consequence scenario

Confidence

Weather Forecast

Saturday: Cloudy with sunny periods and isolated flurries. Accumulation: 4 cm. Alpine: High -6 °C. Ridge wind west: 20 km/h gusting to 55 km/h. Freezing level: 1400 metres.Sunday: Cloudy with sunny periods and isolated flurries. Precipitation: Trace. Alpine: High -9 °C. Ridge wind southwest: 15 km/h. Freezing level at valley bottom.

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