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Avalanche Forecast

Archived

Feb 11th, 2025–Feb 12th, 2025

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, Moyie, St. Mary.

Continuously assess conditions as you move through terrain.

Avalanches are possible where the upper snowpack feels "stiff and slabby".

Confidence

Moderate

Avalanche Summary

Over the past few days several size 1 wind and persistent slab avalanches have been reported. These avalanches released on the surface hoar layer from late January and were on a variety of aspects at treeline. Triggers included explosives, ski cuts and skier accidental.

Rider triggering is possible where a stiffer slab exists above the late January buried weak layers and sluffing will be seen in steep terrain features.

Snowpack Summary

Exposed terrain in the alpine and treeline is variably wind-affected. In sheltered terrain a layer of surface hoar or a sun crust can be found on or just below the surface.

20 to 60 cm of faceted snow overlies a weak layer from late January. This layer consists of a crust on sun exposed slopes and a layer of surface hoar on all other aspects.

The mid and lower snowpack is generally well settled.

Check out this MIN report from the eastern side of this region.

Weather Summary

Tuesday Night

Clear periods. 10 to 20 km/h north ridgetop wind. Treeline temperature -17 °C.

Wednesday

A mix of sun and cloud. 10 to 20 km/h northeast ridgetop wind. Treeline temperature -12 °C.

Thursday

A mix of sun and cloud. 10 to 20 km/h northeast ridgetop wind. Treeline temperature -17 °C.

Friday

Cloudy with new snow up to 5 cm. 10 km/h southwest ridgetop wind. Treeline temperature -10 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for remote triggering and large avalanches due to buried surface hoar.
  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.
  • Be careful as you transition into wind-affected terrain.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.