Avalanche forecast

Jasper

Nov 24 – 25, 2021
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Avalanche danger

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

After a brief lull in the the weather on Wednesday, strong winds and precipitation will return on Thursday increasing the avalanche hazard.

Avalanche problems

  • Wind Slabs

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

    Even though the winds have died down there are lurking windslabs  from previous winds in lee and cross loaded features. 

  • Deep Persistent Slabs

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

    60-80cm of storm snow from Nov 13-15th has settled over a series of crusts and weak snow crystals at the base of the snowpack.

Weather Forecast

Tonight: Clear periods.

Alpine temperature: Low -13 C.

Ridge wind west: 10-30 km/h.

Wednesday: Cloudy with sunny periods and isolated flurries.

Precipitation: Trace.

Alpine temperature: High -11 C.

Ridge wind southwest: 20-40 km/h.

Thursday: Flurries.

Accumulation: 8 cm.

Alpine temperature: Low -12 C, High -7 C.

Ridge wind southwest: 20 km/h.

Snowpack Summary

Previous strong SW winds stripped all aspects in the alpine. New snow with warm temperatures and moderate winds have likely create new wind slabs. Above freezing temperature to 2000m will likely result in a future crust. A 1-2cm thick crust 80cm down is found up to 2500m. Below this crust are more crusts or facets depending on elevation.

Avalanche Summary

No new avalanches were observed on Monday.

Confidence

Due to the number and quality of field observations

Regions covered