Avalanche Forecast
Issued: Dec 25th, 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
Seek out sheltered, moderate-angled slopes for the best and safest riding.
Summary
Confidence
Moderate
Avalanche Summary
On Tuesday, several skier-triggered wind slabs were reported from alpine and treeline terrain. In the Invermere area, several skier-triggered deep persistent slabs (size 1) were reported from NW-NE aspects at treeline and below. A few natural (size 1-2) wind slabs were also reported from alpine terrain.
Looking forward to Wednesday, fresh reactive wind slabs are expected to form in lee areas throughout the day as southwest wind redistributes new snow.
Snowpack Summary
Up to 15 cm of new snow can be expected by end of day Thursday. Southwest winds will redistribute this new snow, forming deeper deposits on leeward slopes 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
Wednesday Night
Mostly cloudy with up to 3 cm of new snow. 15 to 40 km/h southwest ridgetop wind. Treeline temperature -8 °C.
Thursday
Cloudy with up to 10 cm of new snow. 30 to 50 km/h southwest ridgetop wind. Treeline temperature -5 °C.
Friday
A mix of sun and cloud with isolated flurries. 15 to 30 km/h southwest ridgetop wind. Treeline temperature -7 °C.
Saturday
Cloudy with up to 10 cm of new snow. 30 to 60 km/h southwest wind. Treeline temperature -3 °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
Fresh, reactive wind slabs are expected to form throughout the day. Avoid wind-loaded areas where the snow surface feels stiff or slabby.
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 26th, 2024 4:00PM
