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Archived

Avalanche Forecast

Nov 22nd, 2024–Nov 23rd, 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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

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

The storm slab problem continues to build.
Watch for signs of instability, like whumpfing or shooting cracks, and turn back if you see them.

If you go out, consider a MIN.

Confidence

Low

Avalanche Summary

Reports are very limited at the moment but the storm slab is sensitive to human triggering and natural avalanches are possible.

Several large (size 2-2.5) storm slab avalanches occurred in the Lizard range near Fernie on Thursday.

Snowpack Summary

Around 35 cm of recent storm snow sits on top of another 30-40 cm from last weekend, which in some areas has a layer of surface hoar crystals underneath.
The bottom of the snowpack is moist snow, and in some areas has transformed into a crust from early November that is just above the ground. The crust has acted as a bed surface for recent avalanches.
Snowpack depth is 110-180 cm at treeline.

Weather Summary

Friday Night

Cloudy with 10 to 20 cm of snow. 30 km/h south ridgetop wind. Treeline temperature -4 °C.

Saturday

Mostly cloudy with 5 to 10 cm of snow. 10 to 20 km/h west ridgetop wind. Treeline temperature -6 °C.

Sunday

Mix of sun and cloud with 5 to 10 cm of snow. 20 km/h southwest ridgetop wind. Treeline temperature -7 °C.

Monday

Mix of sun and cloud with 5 to 10 cm of snow. 20 km/h southwest ridgetop wind. Treeline temperature -6 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Don't let storm day fever lure you into consequential terrain.
  • 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