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Avalanche Forecast

Archived

Feb 12th, 2025–Feb 13th, 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

On Tuesday, a few isolated wind slabs up to size 1 were human triggered from steep northeast facing terrain at treeline.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.

Weather Summary

Wednesday Night

Clear periods. 15 km/h northwest ridgetop wind. Treeline temperature -18 °C.

Thursday

A mix of sun and cloud with a trace of new snow. 10 to 20 km/h southeast ridgetop wind. Treeline temperature -9 °C.

Friday

Cloudy with new snow 2 to 8 cm. 10 to 20 km/h southeast ridgetop wind. Treeline temperature -9 °C.

Saturday

Cloudy with sunny periods and isolated flurries. 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 careful as you transition into wind-affected terrain.
  • Approach steep and open slopes at and below treeline cautiously, as buried surface hoar may exist.
  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.

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.