Avalanche forecast

Jasper

Apr 25 – 26, 2019Parks Canada
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Archived · expired 7 years ago

Avalanche danger

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

Forecasts don't agree on how much snow is expected. Keep your eyes open and watch for changing conditions on Friday.

Avalanche problems

  • Wind Slabs

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

    Continued winds up high building are likely building wind slabs in the alpine.

  • Persistent Slabs

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

    Snow on Friday night could increase the likelihood of triggering.

  • Loose Wet

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

    Watch out for sunny periods and slopes catching the sun.

Weather Forecast

Parker Ridge:

Forecasts differ on snow amounts starting Friday night.

Friday: Periods of snow 15cm. Treeline Temp -1C. Light ridge winds 35km/h. Freezing Level 2100m

Saturday: Periods of snow 14cm. Treeline Temp low -8C, High -4C. Ridge winds NE 20km/h gusting 70km/h. Freezing Level 1500m

Snowpack Summary

Ongoing moderate to strong westerly winds have created fresh wind slabs in N to E features. The upper snowpack overlies several crusts / facet layers in the upper 40cm, and a faceted layer down 70cm on shady aspects. Expect unsupportive slush at lower elevations in the afternoon if the sun comes out.  Watch for building storm slabs in the PM.

Avalanche Summary

Recent whumfing in low angle alpine terrain.

1 size 1.5 Steep N aspect alpine, cornice triggered windslab that appears to have stepped down to a persistent layer.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Friday

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