Avalanche Forecast
Issued: Jan 9th, 2025 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
Avalanche Canada,
Avalanche Canada
Carefully check for wind slabs before committing yourself to a consequential feature.
Wind slabs are getting larger and more likely to avalanche under the weight of a human.
Summary
Confidence
High
Avalanche Summary
On Wednesday, several small (up to size 1.5) natural and human triggered wind and storm slab avalanches were reported, as well as sluffing with rider traffic in steep terrain.
Recently, there were reports of glide cracks opening up and glide slab avalanches up to size 2. Notably more than usual. This problem may exist only in these isolated features, but we'll see if a pattern emerges.
Snowpack Summary
25 to 40 cm of recent snow covers a thin crust in some areas. Moderate southwest and west winds may have formed wind slabs on lee slopes at treeline and above. A spotty layer of surface hoar (weak, feathery crystals) is found 40 to 50 cm deep. On south-facing slopes, this layer may be a crust.
A crust/facet/surface hoar layer (buried in early December) may be found 90 to 160 cm deep. It was previously most active south of Highway 5, but it no longer seems to be an avalanche problem for this forecast area.
Weather Summary
Thursday Night
Increasing cloud with moderate flurries starting. Up to 10 cm of snow. 20-40 km/h southwest ridgetop wind. Possible temperature inversion above 1500 m. Treeline temperature-3 °C.
Friday
Cloudy with 5 to 15 cm of snow. 20 to 40 km/h west ridgetop wind. Temperature inversion breaks down. Treeline temperature -7 °C.
Saturday
Mostly cloudy with 5 to 10 cm of snow west of the Columbia River. 20 to 40 km/h northwest ridgetop wind. Treeline temperature -6 °C.
Sunday
Cloudy with up to 2 cm of snow. 15 to 30 km/h northwest ridgetop wind. Treeline temperature -8 °C.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- The snowpack is generally stable; it may be appropriate to step out into more complex terrain.
- Pay attention to isolated wind affected features in the alpine, as well as cross-loaded features at treeline.
- Avoid areas where the snow feels stiff and/or slabby.
- Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.
Problems
Wind Slabs
Human triggerable wind slabs may be found below ridgetops and in cross-loaded terrain. They may be more reactive where they have formed in shallow, rocky terrain with a more faceted snowpack.
Aspects: North, North East, East, South East, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Jan 10th, 2025 4:00PM
