Avalanche forecast

Jasper

Feb 1 – 2, 2021
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Avalanche danger

Tue
Wed
Alpine
3 · Considerable
Treeline
3 · Considerable
Below
2 · Moderate
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Highlights

Weather forecasts are showing uncertainty regarding the amount of new snow we may receive, ranging from 15cm to to 45cm over the next 48hrs.

Expect Hwy 93N closures for avalanche control and heightened avalanche danger if the amounts are significant.

Avalanche problems

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible - Likely
    Size
    1–3.5

  • Loose Dry

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

    Size and likelihood dependent on precip amounts. Previous surface faceting could make this problem more reactive.

  • Storm Slabs

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

    Likelihood and size dependent on wind effect and precip amounts

Weather Forecast

Sunday night: Flurries. Accumulation: 11 cm. Low -5 C. Ridge wind south: 15 km/h gusting to 40 km/h.

Monday: Snow. Accumulation: 19 cm. High -2 C. Ridge wind south: 15-35 km/h. Freezing level: 1900 metres.

Tuesday: Flurries. Accumulation: 10 cm. High -4 C. Ridge wind southwest: 15 km/h gusting to 50 km/h. Freezing level: 1600 metres.

Snowpack Summary

Up to 35cm of storm snow could accumulate up to Mon eve. Expect to find new wind slab on lee ridgetop features and below. The new snow will overlie previously wind affected surfaces in non-sheltered areas in the alpine and below as well as widespread surface facets. Strong mid-pack in deeper areas overlies supportive basal layers.

Avalanche Summary

Field team reports no new avalanche activity observed.

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Confidence

Intensity of incoming weather systems is uncertain on Monday

Regions covered