Storm Slabs
N
NE
E
SE
S
SW
W
NW
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible - Likely
- Size
- 1–2
Up to 30 cm of recent snow and strong southwest winds have formed fresh storm slabs that will be most reactive in wind affected terrain.
Avalanche forecast
View on mapKootenay Boundary
Dec 19 – 20, 2025Avalanche Canada
Archived · expired 9 months ago
Avalanche danger
Sun
Mon
Alpine
3 · Considerable
Treeline
3 · Considerable
Below
2 · Moderate
Highlights
Storm slabs remain reactive to human triggers, especially in wind affected terrain.
Continue to make conservative terrain choices while the storm snow settles and stabilizes.
Avalanche problems
Confidence
Moderate
- Uncertainty is due to the limited number of field observations.
Avalanche Summary
On Wednesday, numerous explosive triggered storm slab avalanches up to size 2 were reported at all elevations on a variety of aspects.
Snowpack Summary
20 to 30 cm of recent snow and strong southwest winds have formed slabs overlying a thick crust.
Below the crust, the snowpack is likely moist to the ground.
Weather Summary
Thursday Night
Cloudy. 5 to 15 cm of snow. 50 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1500 m.
Friday
Mostly cloudy. 30 km/h southwest ridgetop wind. Treeline temperature -7 °C. Freezing level 1300 m.
Saturday
Mostly cloudy with flurries. 3 to 10 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -8 °C. Freezing level 1000 m.
Sunday
Mostly cloudy with isolated flurries. 0 to 5 cm of snow. 35 km/h south ridgetop wind. Treeline temperature -6 °C. Freezing level 1000 m.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Make conservative terrain choices and avoid overhead hazard.
- Avoid freshly wind-loaded features, especially near ridge crests, rollovers, and in steep terrain.
- Use small, low consequence slopes to test the bond of the new snow.
- Closely monitor how the new snow is bonding to the crust.