Avalanche Forecast
Issued: Dec 26th, 2024 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Loose Wet.
Avalanche Canada,
Avalanche Canada
Wind slabs that overlie faceted snow could remain surprisingly reactive to human triggers. Err on the side of caution when evaluating older slabs, especially near shallow, rocky areas.
Summary
Confidence
Moderate
Avalanche Summary
Skiers remote-triggered a large wind slab from 100 m away in the Little Simpson area on Hudson Bay Mountain on Monday. It failed on faceted snow, a reminder that persistent grains may extend the reactivity of wind slabs.
Up north, a 40 cm-deep layer of surface hoar on the early-December crust was recently reactive to skiers in the Ningunsaw area. The Ningunsaw slide path produced size 2.5 and size 3 avalanches on Monday and Tuesday night.
Share your observations on the MIN!
Snowpack Summary
Light new snow amounts have been combining with an aging wind slab problem and with otherwise heavily wind affected surfaces in the alpine and at treeline.
The crust from early December is now buried approximately 30 to 50 cm deep. In some areas, large surface hoar crystals are found at this interface. We are trying to track the distribution of this surface hoar across the region. Faceted snow is perhaps more likely to find at this interface and poses a similar problem.
The are no layers of concerns below the early December crust.
Weather Summary
Thursday night
Cloudy with scattered flurries and less than 5 cm of new snow. 15 to 30 km/h southwest ridgetop wind. Treeline temperature -4 °C.
Friday
Partly cloudy. 15 to 30 km/h southwest ridgetop wind. Treeline temperature -5 °C.
Saturday
Mainly cloudy with isolated flurries. 10 to 20 km/h southeast ridgetop wind. Treeline temperature -7 °C.
Sunday
Mainly cloudy with isolated flurries. 5 to 10 km/h southeast ridgetop wind shifting southwest. Treeline temperature -6 °C.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Avoid freshly wind-loaded features, especially near ridge crests, rollovers, and in steep terrain.
- Seek out wind sheltered terrain below treeline where you can avoid wind slabs and find great riding.
- Remote triggering is a concern; avoid terrain where triggering overhead slopes is possible.
Problems
Wind Slabs
Continuing light snowfall and southerly winds are promoting wind slab formation on an ongoing basis.
Investigate for wind slab around ridges or lee features and use wide safety margins - remote triggering has been observed.
Aspects: North, North East, East, West, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Loose Wet
Periods of sun could destabilize snow on steep, south facing slopes. Recent snow may shed naturally or with a human trigger.
Aspects: South East, South, South West.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Dec 27th, 2024 4:00PM
