Avalanche Forecast

Issued: Feb 23rd, 2020 4:00PM

The alpine rating is considerable, the treeline rating is considerable, and the below treeline rating is considerable. Known problems include Storm Slabs.

Avalanche Canada JSmith, Avalanche Canada

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The developing storm slabs are expected to be reactive to human triggers on Monday. Careful terrain selection and route finding will be required to effectively manage risk.

Summary

Confidence

Moderate - Uncertainty is due to how buried persistent weak layers will react with the forecast incoming weather.

Weather Forecast

SUNDAY NIGHT: 2-5 cm snow, light west wind, alpine temperature -9 C, freezing level below valley bottom.

MONDAY: Mostly cloudy with possible flurries; 0-5 cm, light southwest wind, alpine temperature -6 C, freezing level 400 m

TUESDAY: Cloudy with flurries; 3-5 cm, moderate southwest wind, alpine temperature -5 C, freezing level 600 m.

WEDNESDAY: Cloudy, light to moderate southwest wind, alpine temperature -3 C, freezing level rising to 1200 m.

Avalanche Summary

On Saturday the new snow was reported as being reactive to skier traffic as a very thin soft slab, especially in wind affected terrain. These slabs will become increasingly touchy as the new snow stacks up and settles into a cohesive slab.

Snowpack Summary

15-30 cm of recent snow has buried a widespread layer of surface hoar (size 5-15 mm.). This layer exists on all aspects and elevations except for steep solar aspects where it was melted by sun and formed a crust. Surface hoar sitting on a thin sun crust may exist on lower angle solar aspects which is a particularly nasty combination. The new snow will likely become increasingly reactive to human triggers as it stacks up and settles into a cohesive slab. The mid and lower snowpack are generally well settled and strong.

Terrain and Travel

  • Shooting cracks, whumphs and recent avalanches are strong indicators of an unstable snowpack.
  • Be aware of the potential for larger than expected storm slabs due to the presence of buried surface hoar.
  • Be alert to conditions that change with elevation and wind exposure.
  • Carefully assess open slopes and convex rolls where buried surface hoar may be preserved.

Problems

Storm Slabs

An icon showing Storm Slabs

20-30 cm. of recent snow is sitting on top of a widespread layer of surface hoar at all elevations. On solar aspects the surface hoar is sitting on a crust, a particularly nasty combination. 

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Likely - Very Likely

Expected Size

1 - 2

Valid until: Feb 24th, 2020 5:00PM