Avalanche forecast

Banff Yoho Kootenay

Nov 21 – 22, 2019Parks Canada
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Archived · expired 7 years ago

Avalanche danger

Fri
Sat
Alpine
2 · Moderate
Treeline
1 · Low
Below
1 · Low
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Highlights

Many early season hazards are just under a skiff of snow. Its not the time to charge especially at lower elevations.

Avalanche problems

  • Wind Slabs

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

    Small amounts of new snow and recent strong SW wind on Monday have created wind-slabs in lee areas in the alpine.

  • Deep Persistent Slabs

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

    The basal facets and Oct crust have been most reactive in the Lake Louise area, but it is likely that similar pockets exist throughout the forecast area. Keep watching for weak areas at the base of the snowpack, especially in steep or convex terrain.

Weather Forecast

Little change in the weather forecast for the remainder of the week. Day time high temps for valley bottom will hover around 0 degrees. The sky will remain clear and winds light.

Snowpack Summary

15 to 30cm of winds slab is present on alpine and tree line lee slopes. This wind slab problem overlays several faceted layers in the mid pack. Well developed weak facets near the ground and the Oct crust, have resulted in easy test results in some areas. Treeline snow depths range from 50-80 cm, with up to 110 cm in wind loaded alpine areas.

Avalanche Summary

Few loose dry avalanches observed from steep alpine terrain to size 1.5. These avalanches appear to have released from loose surface snow.

Confidence

Regions covered