Avalanche Forecast

Issued: Nov 21st, 2024 3:00PM

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

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Lots of new snow has increased the avalanche danger.

The best and safest riding will be found on low-angle slopes with no terrain traps below.

Summary

Confidence

Low

Avalanche Summary

A large (size 2.5) natural storm slab occurred on Thursday in the Lizard Range. It was on a fan feature below a headwall.

Numerous small, wind slabs were triggered by riders in open areas near Nelson on Wednesday.

A large rider-accidental avalanche was triggered at Harvey Pass, Fernie on Monday. It started as a storm slab and stepped down to the crust near the base of the snowpack.

Snowpack Summary

The top of the snowpack consists of 20 cm of new snow on top of another 30-40 cm from last weekend.
The bottom is moist snow or a crust from early November that is just above the ground. The crust has acted as a bed surface for recent avalanches, it's unclear how long this layer will last.
Snowpack depth is 80-100 cm at treeline.

Weather Summary

Thursday Night

Cloudy with 5 to 10 cm of snow. 10 km/h southwest ridgetop wind. Treeline temperature -3 °C.

Friday

Cloudy with 5 to 10 cm of snow. 10 km/h east ridgetop wind. Treeline temperature -5 °C.

Saturday

Cloudy with 10 to 20 cm of snow. 10 to 20 km/h west ridgetop wind. Treeline temperature -6 °C.

Sunday

Mostly cloudy with 5 to 10 cm of snow. 10 km/h west ridgetop wind. Treeline temperature -6 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for fresh storm slabs building throughout the day.
  • As the storm slab problem worsens, the easy solution is to choose more conservative terrain.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.

Problems

Storm Slabs

An icon showing Storm Slabs

New snow needs time to settle and bond. If triggered, this problem may run on the crust near the base of the snowpack.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Likely - Very Likely

Expected Size

1 - 2.5

Valid until: Nov 22nd, 2024 3:00PM

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