Avalanche forecast

Jasper

Apr 29 – 30, 2019Parks Canada
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Archived · expired 7 years ago

Avalanche danger

Wed
Thu
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
1 · Low

Highlights

Time to reapply that cold snow wax!  Winter lingers on in Jasper, with buried crusts being the only reminder of warm spring days.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely - Possible
    Size
    1–2

    Snowfall with strong N winds created wind slabs on Saturday; however likelihood of triggering is dropping over time. Old wind slabs on N aspects may also remain a possibility on high alpine slopes in the Icefields.

  • Persistent Slabs

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

    Cool temperatures mean little change for this problem; triggering remains possible in the alpine. Crusts in the upper snowpack, and deeper facet layers warrant further investigation.

Weather Forecast

Continued cool weather & scattered flurries.  Change arrives with a front Wednesday.

Tuesday: Mainly cloudy, treeline low -9, high -5, light N winds, freezing level 1400m. 

Wednesday:  Cloud, snowfall developing.  Freezing level 1700m, treeline high -4, light winds.

Snowfall continues, with around 30cm forecast by the weekend.

Snowpack Summary

15cm storm snow from early in the weekend was reverse loaded by Strong N-NE winds, and overlies several crusts/facet layers in the upper snowpack. Stubborn windslabs can be expected on unusual aspects in the alpine, and in exposed treeline terrain. A faceted midpack layer on shady alpine slopes remains a concern.

Avalanche Summary

No patrol Monday, no avalanches reported. On Sunday, one recent size 2.5 Persistent slab was observed in the Maligne Range. This was on an East aspect, in convex alpine terrain. Meanwhile, no new activity was noted on an icefields parkway road patrol.

Confidence

Due to the number of field observations

Regions covered