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Avalanche Forecast

Archived

Nov 25th, 2024–Nov 26th, 2024

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Kootenay Boundary, Bonnington, Grohman, Kootenay Pass, Norns, Rossland, Ymir, Crawford, Kokanee.

The fresh snow has formed touchy storm slabs, especially in wind-exposed terrain.

Start conservative and watch for signs of instability like cracking or whumpfing.

Confidence

Low

Avalanche Summary

No new avalanches have been reported.

Storm slabs may sensitive to human triggering and natural avalanches are possible.

If you head into the backcountry, consider submitting a MIN report.

Snowpack Summary

10 to 20 cm of new snow fell on Sunday and Monday. This brings storm snow accumulations around 40 to 50 cm over the past week.

Stiffer wind-affected snow may be found near ridgelines and on open slopes. The surface snow remains soft in wind protected areas, like the trees.

Below the surface, the upper snowpack is more consolidated and reports indicate it may sit on a layer of surface hoar buried 50-60 cm down.

The bottom of the snowpack has a crust from early November that is just above the ground.

Snowpack depth is 100 - 180 cm at treeline.

Weather Summary

Monday Night

Cloudy with 2 to 5 cm of snow. 15 gusting to 40 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level valley bottom.

Tuesday

Cloudy with isolated flurries. 15 to 25 km/h west ridgetop wind. Treeline temperature -2 °C.

Wednesday

Mostly cloudy with isolated flurries. 15 to 20 km/h northwest to west ridgetop wind. Treeline temperature -5 °C.

Thursday

Mostly cloudy with isolated flurries. 10 to 20 km/h northwest ridgetop wind. Treeline temperature -7 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Keep your guard up as storm slabs may remain sensitive to human triggering.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.