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Avalanche Forecast

Archived

Nov 26th, 2024–Nov 27th, 2024

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.
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.

Fresh and reactive wind slabs may form at treeline and above as westerly winds increase on Wednesday.

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

Confidence

Low

Avalanche Summary

No recent avalanche reports.

Fresh wind slabs could be sensitive to human triggering, especially on open slopes and terrain features near ridgelines.

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 70 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

Tuesday Night

Cloudy with clear periods. 10 to 30 km/h west ridgetop wind. Treeline temperature -7 °C. Freezing level valley bottom.

Wednesday

Mostly cloudy. 15 to 35 km/h northwest ridgetop wind. Treeline temperature -7 °C.

Thursday

Cloudy with isolated flurries. 10 to 20 km/h west ridgetop wind. Treeline temperature -8 °C. Freezing level 800 m.

Friday

Cloudy with isolated flurries. 15 to 50 km/h west ridgetop wind. Treeline temperature -10 °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.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.