Avalanche forecast

Jasper

Feb 21 – 22, 2021
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Archived · expired 6 years ago

Avalanche danger

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

It's been a while, but a storm is coming!

Watch for signs of instability, and avoid overhead exposure during periods of rapid loading and rising temperatures.

Avalanche problems

  • Wind Slabs

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

    Strong to extreme SW winds with new snow are likely to build wind slabs in the alpine and tree line areas.

  • Deep Persistent Slabs

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

    Caution in thin snowpack areas where triggering is more likely. This is a low probability but high consequence problem.

Weather Forecast

Sunday: Periods of snow. Accumulation: 17 cm. Alpine temperature: High -6 C. Ridge wind southwest: 35 km/h gusting to 90 km/h. Freezing level at valley bottom.

Monday: Flurries. Accumulation: 7 cm. Alpine temperature: Low -14 C, High -5 C. Ridge wind west: 25 km/h gusting to 80 km/h. Freezing level: 1400 metres.

Snowpack Summary

Moderate to strong ridge top winds from the SW have created wind slabs or hard surface conditions in alpine and tree line features. In sheltered areas the top 30-60cm is faceted snow over a supportive mid-pack where the snowpack is deeper. Thin snowpack areas are weak, un-supportive, and facetted.

Avalanche Summary

No new avalanches have been observed in the past couple days.

Confidence

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

Regions covered