Avalog Join
Archived

Avalanche Forecast

Nov 21st, 2024–Nov 22nd, 2024
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Bonnington, Crawford, Flathead, Grohman, Kokanee, Kootenay Boundary, Kootenay Pass, Lizard, Lizard-Flathead, Moyie, Norns, Rossland, St. Mary, Ymir.

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.

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.

Avalanche Problems

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