Avalanche forecast

Jasper

Nov 24 – 25, 2020
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Avalanche danger

Wed
Thu
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
1 · Low
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Highlights

Fat hard slabs on facets and early season hazards are still a big concern out there, hope for lots of snow Tuesday night!

Avalanche problems

  • Wind Slabs

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

    Recent winds and snow have formed wind slabs

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely - Possible
    Size
    1–2.5

    Pockets of previous wind deposited snow overlies the Nov 4 rain crust. Test results are mixed on this layer but appears to be becoming more reactive with increased loads and continued faceting

Weather Forecast

Tuesday, Flurries: 10 cm. Alpine temperature: High -7 °C. Ridge wind southwest: 20-35 km/h.

Wednesday, Scattered flurries: 5 cm. Alpine temperature: Low -14 °C, High -7 °C. Ridge wind west: 10-30 km/h.

Thursday, Cloudy with sunny periods and isolated flurries: Trace. Alpine temperature: Low -13 °C, High -10 °C. Ridge wind west: 20 km/h.

Snowpack Summary

The snowpack is highly variable depending on location. Height of snow at Parkers is ~100cm at treeline. The Nov.4 crust up to 2600m, and is up to 70cm deep. Test results on this crust have shown a mix of mod sudden/resistent planar results. Continued wind slab develop on N and E aspects ridgetop down into treeline. Basal layers continue to weaken

Avalanche Summary

Several natural wind slab and dry loose avalanches in the alpine on north aspects have been observed in the Icefields, Jasper and Bald hills region over the past few days. Natural avalanche activity has decreased, but there is still significant concern for human triggering.

Confidence

Forecast snowfall amounts are uncertain on Wednesday

Regions covered