Avalanche Forecast

Issued: Dec 24th, 2024 4:00PM

The alpine rating is considerable, the treeline rating is moderate, and the below treeline rating is low. Known problems include Wind Slabs.

Avalanche Canada Avalanche Canada, Avalanche Canada

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Not all wind slab problems are created equal. Recent touchy, remote triggering demands careful terrain analysis and selection. Seek out sheltered snow to stack the odds in your favour.

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 and is a concerning example of the snowpack's current potential.

Up north, a 20 - 40 cm deep layer of surface hoar on the early-December crust was reactive to skiers in the Ningunsaw area recently and produced a large natural avalanche in the same area on Monday.

Please share your observations on the Mountain Information Network.

Snowpack Summary

Light new snow amounts have been adding to heavily wind affected surfaces in the alpine and at treeline. By end of day on the 25th, we should see another 5 - 10 cm.

The crust from early December is now buried 20 to 40 cm. 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.

Check out this helpful MIN report.

Weather Summary

Tuesday night

Cloudy with scattered flurries and up to 5 cm of new snow. 40 to 50 km/h southwest ridgetop wind. Freezing level 1000 m.

Wednesday

Cloudy with flurries bringing around 5 cm of new snow in the afternoon. 30 to 50 km/h southeast ridgetop wind. Treeline temperature approaching -1 °C with freezing level reaching 1300 m by end of day.

Thursday

A mix of sun and cloud with isolated flurries. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -1 °C.

Friday

Mainly cloudy with isolated flurries. 30 to 40 km/h south ridgetop wind. Treeline temperature -4 °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

An icon showing 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

Likely - Very Likely

Expected Size

1 - 2

Valid until: Dec 25th, 2024 4:00PM

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