Avalanche forecast

Jasper

Dec 10 – 11, 2021
View on map
Archived · expired 5 years ago

Avalanche danger

Sat
Sun
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
1 · Low

Highlights

MIN reports speak of good to excellent riding quality in sheltered areas! Be mindful of newly formed wind slabs and our deep persistent slab problem when making terrain choices.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1.5–2.5

    Variable amount of new snow and moderate SW winds creating new windslab in lee and crossloaded features. Watch for hollow sounds and cracking. Consider testing smaller slopes before committing to larger features; windslabs could initiate deep layers.

  • Deep Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    2–3.5

    Triggering this layer would be a high consequence event - cautious decisions and thorough investigation is necessary. More likely to trigger this layer in transitions from thin snowpack to deeper loaded pockets or terrain features.

Weather Forecast

Friday: Scattered flurries. Accumulation: 4 cm. Alpine temperature: Low -16 C, High -14 C. Ridge wind SW: 25 to 40 km/h

Saturday: Snow. Accumulation: 25 cm. Alpine temperature: Low -13 C, High -8 C. Ridge wind SW: 20 km/h gust to 55

Sunday: Flurries: Accumulation: 6 cm. Alpine temperature: Low -21 C, High -13 C. Ridge wind SW 15 km/h gust to 45

Snowpack Summary

Incremental amounts of new snow being redistributed by moderate SW winds; exposed alpine features continue to be scoured. In sheltered areas 20-30cm settled snow sits atop a supportive midpack. Soft slab forming in open areas. Our basal crust/facet/depth hoar combo near the ground remains a layer of concern. Snowpack depth 100-140cm Icefields area.

Avalanche Summary

No new avalanches have been reported. Human triggering of large avalanches remains possible especially in features with variable thin to thick snow depths in the alpine and at treeline.

Confidence

Forecast snowfall amounts are uncertain

Regions covered