Avalanche forecast

Jasper

Apr 29 – 30, 2023Avalanche Canada
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Archived · expired 3 years ago

Avalanche danger

Mon
Tue
Alpine
4 · High
Treeline
4 · High
Below
4 · High
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Highlights

All melt no freeze... and a large avalanche cycle are expected to continue for the foreseeable future.

Avalanche problems

  • Cornices

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1–3

    Cornices will become increasingly unstable as the warm weather continues, and will likely act as triggers for the deep persistent slab problem.

  • Loose Wet

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Certain
    Size
    1–3

    Warming temperatures will continue to produce wet loose avalanches.

  • Deep Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    2–4

    The bottom of the snowpack is inherently weak with well-developed Facets and Depth Hoar. These avalanches have the potential to reach the end of run out zones well below tree line.

Confidence

High

Avalanche Summary

widespread natural large to very large loose wet and slab avalanche activity observed on the Icefields patrol on Saturday. Reports of large loose wet cycle in the Maligne Rd area from Friday afternoon.

Post avalanche observations to the MIN.

Snowpack Summary

As alpine temperatures reach double digits, surface crusts are losing cohesion and amalgamating into moist snow. A crust/facet PWL lingers in the mid-pack in many areas at tree line and above. The main concern is the depth hoar and basal facets at the base of the snowpack.

Weather Summary

A dramatic rise in daytime temperatures and strong solar radiation is forecasted for the next several days. There is also forecasted to be warm air trapped at higher elevations overnight, so don't let cool early mornings at valley bottom mislead you into thinking there has been a good overnight freeze.

Terrain and Travel Advice

  • Only the most simple non-avalanche terrain free of overhead hazard is appropriate at this time.

Regions covered