Avalanche forecast

Jasper

Nov 22 – 23, 2020
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Avalanche danger

Mon
Tue
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
1 · Low
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Highlights

Avoid areas that have been wind loaded and watch for rocks/fallen trees that might lurk just below the surface. Public field reports can be submitted through the MIN and are much appreciated

Avalanche problems

  • Wind Slabs

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

    Up to 45cm of new snow with moderate winds at ridge top has produced windslabs in the immediate lee at ridge tops and down into tree line.

  • 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.

Weather Forecast

Tonight: Mainly cloudy. Precip: Nil. Alpine temps: Low -10 C. Ridge wind SW: 15 km/h. Freezing level at valley bottom.

Sunday: Isolated flurries. Precip: Trace. Alpine temp: High -8 C. Ridge wind SW: 15-30 km/h. Freezing level at valley bottom.

Monday: Isolated flurries. Precip: Trace. Alpine temp: Low -9 C, High -7 C. Ridge wind SW: 10-30 km/h.

Snowpack Summary

Up to 45cm of new snow over the past 72 hours .The snowpack is ~100cm at treeline. The Nov. 4th rain crust up to 2600m depending on location, and is up to 70cm deep. Continued wind slab development on N and E aspects ridgetop down into treeline.

Avalanche Summary

Several natural wind slab avalanches in the alpine on north aspects have been observed in the Jasper and Bald hills region over the past 48 hours. No field trips today, limited observations

Confidence

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

Regions covered