Avalanche forecast

Jasper

Dec 24 – 25, 2020
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Archived · expired 6 years ago

Avalanche danger

Fri
Sat
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
1 · Low

Highlights

Sensitive wind slab continues to develop tree line and above all aspects. Dry loose problem will persist as well with continued wind input. Be wary of overhead exposure and conservative with terrain selection!

Avalanche problems

  • Wind Slabs

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

    Previous NW and present SW winds in the Alpine and open Tree line continue to develop wind slab all aspects. Caution as these freshly built wind slabs are reactive and waiting for a trigger.

  • Loose Dry

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

    Numerous dry loose avalanches up to size 2 out of steep alpine terrain noted yesterday on Mt.Wilson, Heads up climbers, There is a lot of overhead above you at the moment.

  • Deep Persistent Slabs

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

    Be cautious of thick to thin snowpack areas being likely trigger locations. The wind slabs have the potential to step down to the weakness at the base of the snowpack.

Weather Forecast

A mix of sun and cloud Thursday and Friday.  Isolated flurries are possible on Saturday.

Ridgetop winds will remain in the light to moderate range from the west and southwest.

No significant precipitation is forecast this week..

Snowpack Summary

Up to 40cm settled storm snow from last week is being pushed around by previous northerly winds and present SW winds TL and above. The new snow sits upon a facet layer with isolated surface hoar sheltered areas TL and below. The midpack is generally supportive with a weaker base consisting of facets and depth hoar. Avg depth is 65-160cm.

Avalanche Summary

No Na activity noted on patrol south.  Field team reporting whumphing and shooting cracks 2300m on southerly aspect - suspect sensitive wind slab up to 60cm deep continuing to develop on specific terrain features all aspects at treeline and above.

Confidence

Regions covered