Avalanche forecast

Banff Yoho Kootenay

Mar 26 – 27, 2018Parks Canada
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Avalanche danger

Wed
Thu
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
1 · Low
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Highlights

Things will start to get touchy as the new snow arrives with strong W winds. Minimize overhead hazard and avoid steep confined terrain until things have a chance to settle. Sheltered areas at lower elevations may provide the best skiing.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible - Likely
    Size
    1–2.5
    Wind slabs and wind effect will increase on Tuesday with the arrival of new snow and continued W winds. We expect to see increased natural avalanche activity, especially as cornices get over loaded and fail, and human triggering will be likely.

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2.5
    As the new snow increases the load over the March 15 crust on solar aspects we may start to see avalanche activity on this layer. If the facets below the crust also fail, larger propagations will be possible.

Weather Forecast

Temperatures will remain below freezing on Tuesday as 10 to 20 cm of new snow arrives with moderate to strong west winds. Precipitation will drop off on Wednesday but expect the winds to remain in the moderate to strong range for the next few days.

Snowpack Summary

Moderate to strong SW winds are creating wind slabs in alpine and treeline areas and beginning to over load cornices. 10-20 cm of recent snow sits over a melt freeze crust on solar aspects with some facets at the crust interface. In shallow snowpack areas the basal facets remain quite weak and may be susceptible to triggering with large loads.

Avalanche Summary

Three size 2-2.5 natural cornice triggered avalanches were observed today with crowns ranging from 20 to 120 cm deep. Two were observed on Helen Ridge and one was seen on Jimmy Junior near Mt Jimmy Simpson. Some whumphing on the buried crust from March 15 was also experienced in the Cirque Peak area.

Confidence

Intensity of incoming weather systems is uncertain on Tuesday

Regions covered