Avalanche Forecast
Issued: Dec 24th, 2024 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Persistent Slabs.
Avalanche Canada,
Avalanche Canada
Reactive wind slabs are present at higher elevations. This is a particular concern around ridge crests in steep, rocky terrain where weak layers deeper in the snowpack are most prominent.
Summary
Confidence
Moderate
Avalanche Summary
Recent avalanche activity across the region has been dominated by wind slabs up to size 2.5. Primarily occurring in steep, alpine terrain on a variety of aspects. Check out the photo and MIN report of a large, skier-triggered wind slab in the dogtooth.
One explosive-triggered size 2.5 avalanche was reported in the north of the region on Sunday. It failed on a buried weak layer, producing a crown up to 100 cm deep. This occurred in very steep, rocky, alpine terrain.
Snowpack Summary
20 to 40 cm of recent snow continues to settle and bond to underlying surfaces. Recent southwest winds have redistributed this snow into deeper deposits at higher elevations.
A layer buried in early December is found roughly 20 to 90 cm below the surface. This layer varies, consisting of weak surface hoar or facetted crystals on shaded slopes and a sun crust with facets on south-facing slopes.
The base of the snowpack is made up of a thick crust and facets in many areas. The only location where this basal layer has shown signs of instability is in the Invermere area.
Weather Summary
Tuesday Night
Mostly cloudy. 30 to 40 km/h west ridgetop wind. Treeline temperature -8°C.
Wednesday
Mix of sun and cloud. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -8 °C.
Thursday
Partly cloudy with 0 to 2 cm of snow. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -8 °C.
Friday
Partly cloudy with 0 to 2 cm of snow. 10 to 20 km/h southwest ridgetop wind. Treeline temperature -8 °C.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Be careful as you transition into wind-affected terrain.
- Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
- If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
Problems
Wind Slabs
Recent snow has been redistributed by southwest wind into reactive wind slabs at higher elevations. Wind slabs may be especially reactive in shallow, rocky terrain where they likely sit atop weak faceted layers.
Aspects: North, North East, East, South East, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Persistent Slabs
Buried surface hoar or facets may pose a risk on north-facing slopes, while a buried sun crust could be reactive in south-facing areas.
In the Invermere area, weak facets and a crust at the base of the snowpack remain a concern.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Dec 25th, 2024 4:00PM
