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Avalanche Forecast

Archived

Apr 15th, 2025–Apr 16th, 2025

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Kootenay Boundary, Lizard-Flathead, Bonnington, Grohman, Kootenay Pass, Norns, Rossland, Ymir, Flathead, Lizard, Crawford, Moyie, St. Mary, Kokanee, Valhalla.

Give cornices a wide margin when travelling beneath them and when on ridgelines.

Confidence

High

Avalanche Summary

A few wet loose avalanches (size 1 to 2) occurred during the warm, sunny weather on Sunday and Monday. With cooler temperatures now in place, cornices are the main concern for the next few days.

Snowpack Summary

Northerly alpine slopes may still hold 10 to 15 cm of soft, dry snow. Elsewhere, a thick, hard crust covers the surface and may soften with daytime warming.

Weak layers deeper in the snowpack are considered dormant, with no recent avalanche activity.

The snowpack is melting rapidly at lower elevations.

Weather Summary

Tuesday Night

Partly cloudy with 0 to 2 cm of snow. 20 km/h northwest ridgetop wind. Treeline temperature +2 °C. Freezing level 2000 m.

Wednesday

Mostly cloudy with 0 to 1 cm of snow in the Monashees and Selkirks, 2 to 5 cm in the Purcells and 5 to 10 cm in the Rockies. 40 km/h northeast ridgetop wind. Treeline temperature -2 °C. Freezing level 1600 m.

Thursday

Mostly sunny. 10 km/h north ridgetop wind. Treeline temperature -1 °C. Freezing level 1800 m.

Friday

Sunny. 10 km/h northwest ridgetop wind. Treeline temperature +1 °C. Freezing level 2100 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.
  • Carefully evaluate big and steep terrain features before committing to them.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Problems

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.