Avalanche forecast

Jasper

Dec 20 – 21, 2014Parks Canada
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Archived · expired 12 years ago

Avalanche danger

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

New snow will be landing on a large surface hoar layer.  This will be a weak layer and freshly wind loaded slopes should be avoided.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely - Possible
    Size
    1–2
    Approach loaded, cross-loaded and re-loaded lee features with caution.

  • Deep Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely - Possible
    Size
    1–3
    These deep persistent slabs at tree line and sheltered alpine slopes may be triggered from shallow areas within the snowpack.

Weather Forecast

Light precipitation through the weekend with a little more on Sunday.  Light SW winds at treeline increasing to moderate in the alpine.  Mild temperatures with freezing levels staying well below treeline.

Snowpack Summary

Surface Hoar continues to form. A strong mid-pack overlies approximately 20-40cm of facets. Isolated wind slabs still exist in open areas at tree line and alpine elevations. The interface between the mid-pack and facets is most susceptible to human triggering from shallow areas.

Avalanche Summary

No observations in the Marmot area today.  No other avalanches reported. There is past evidence of large deep slides in wind loaded features that released in the last cycle.

Confidence

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

Regions covered