Avalanche forecast

Banff Yoho Kootenay

Mar 20 – 21, 2015Parks Canada
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Avalanche danger

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

The new snow has begun to improve ski conditions at treeline and above. Watch for wind slabs in specific terrain features and keep an eye on cornice development over the weekend. Travel remains a bit rugged at lower elevations.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2
    5-10cm of recent storm snow has formed wind slabs up to 35cm in the lee areas of alpine features. These will be sensitive to human triggering on features such as ridge crests and cross loaded gullies. Cornices are also becoming a concern.

  • Deep Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely - Possible
    Size
    2–3
    The lower half of the snowpack is weak due to the presence of basal facets and depth hoar. This layer has been dormant lately but may become more sensitive with the forecasted new snow load, especially in thin areas.

Weather Forecast

Light snow and mild temperatures with moderate SW winds are forecast through Saturday. Sunday we expect a mix of sun and cloud with cooler temperatures. Monday and beyond look unsettled with occasional light precipitation.

Snowpack Summary

8cm of new snow at tree line and above on Friday with moderate SW winds and temperatures near 0`C. Wind slabs present in lee and open areas at tree line and above. The recent snow sits on a variety of surfaces and is generally bonding well. The base of the snowpack is made up of facets and depth hoar and remains weak. Below tree line snow is moist.

Avalanche Summary

Local ski areas were able to ski cut small wind slabs in immediate lees areas on Friday. This problem is expected to increase slightly over the next 36hrs as more snow arrives.

Confidence

Intensity of incoming weather systems is uncertain on Saturday

Regions covered