Avalanche forecast

Jasper

Apr 26 – 27, 2017Parks Canada
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Archived · expired 9 years ago

Avalanche danger

Fri
Sat
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
3 · Considerable
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Highlights

Steady rain on Thursday will increase the avalanche hazard below tree-line. 

Avalanche problems

  • Cornices

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    2–3
    Cornice failures are still being noted periodically on West aspects 2500-2800m.

  • Loose Wet

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1–2
    Rain (5-20 mm) possible on Thursday will increase this problem below tree-line.

  • Deep Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely - Possible
    Size
    2–4
    The deep instability could be triggered by a cornice failure. It is well bridged by a solid mid-pack.

Weather Forecast

15 cm of snow is expected above tree-line by late Thursday afternoon.  This snow will come in with light W winds that will shift to North.  The freezing level will rise to 2000 m  Thursday.  Snow will continue into Saturday with 25 cm total.

Snowpack Summary

20 cm of loose new snow sits over a melt freeze crust in many locations above tree line. The mid-pack is consolidated and bridges the weak base. The bottom snowpack is a mix of weak facets and depth hoar.

Avalanche Summary

Some small solar point releases noted out of rocky areas today.

Confidence

Forecast snowfall amounts are uncertain on Thursday

Regions covered