Avalanche Forecast

Issued: Nov 26th, 2020 4:00PM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Wind Slabs.

Avalanche Canada shorton, Avalanche Canada

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 Windy conditions over the next few days will make avalanches possible in steep open terrain.

Summary

Confidence

Low - Uncertainty is due to the limited number of field observations.

Weather Forecast

Mild and windy conditions over the next few days, especially along the eastern side of the divide where Chinook conditions are expected.

THURSDAY NIGHT: Partly cloudy, strong wind from the west with gusts up to 90 km/h, alpine temperatures drop to -10 C.

FRIDAY: Mix of sun and cloudy, 50-80 km/h wind from the west with gusts up to 100 km/h, freezing level climbing to 1500 m in western parts of the region and 2000 m in eastern parts of thee region.

SATURDAY: A light dusting of new snow overnight then clearing throughout the day, light to moderate wind, freezing level drops to valley bottom and alpine temperatures drop to -10 C.

SUNDAY: Clear skies, 30-50 km/h wind from the southwest, alpine high temperatures around -5 C.

Avalanche Summary

There have been a few reports of small (size 1) naturally triggered wind slab avalanches in steep rocky terrain. These likely occurred on Tuesday. Ongoing wind transport could form more wind slabs over the next few days, so be alert to slopes that have been wind affected.

Please submit your observations to the Mountain Information Network! 

Snowpack Summary

Strong wind over the next few days will redistribute the 10-15 cm of snow that fell on Tuesday night. Snowpack depths are variable with reports of 50 to 100 cm in terrain that hasn't been scoured by the wind. There are some reports of a hard crust buried about 30 cm below the surface, which could be a bed surface for wind slab avalanches. There is most likely a crust at the bottom of the snowpack, and there have been a few reports suggesting weak snow may be forming around these crusts. This layer could become a bigger concern when it gets buried deeper.

Terrain and Travel

  • Be careful as you transition into wind affected terrain.
  • Be especially cautious near rock outcroppings, on steep convexities and anywhere the snowpack feels thinner than average.

Problems

Wind Slabs

An icon showing Wind Slabs

Recent snow will be blowing around the next few days and could form unstable slabs on steep wind-loaded slopes.

Aspects: North, North East, East, South East, North West.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Nov 27th, 2020 4:00PM

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