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Avalanche Forecast

Archived

Apr 2nd, 2024–Apr 3rd, 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.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Kootenay Boundary, Bonnington, Grohman, Kootenay Pass, Norns, Rossland, South Okanagan, Ymir, Crawford, Moyie, St. Mary, Kokanee, Retallack, Valhalla.

Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.

Confidence

High

Avalanche Summary

A naturally triggered size 2 persistent slab that failed on the crust down 80 cm was reported on a northwest aspect at treeline on Monday, but was thought to have occurred on Sunday.

Additionally, several naturally triggered size 1.5 wind slab avalanches were reported on north and east aspects at treeline and above.

Numerous naturally triggered wet loose avalanches up to size 2 were reported on sunny aspects at all elevations.

Snowpack Summary

High freezing levels have formed a surface crust on all aspects and elevations.

30 to 50 cm of snow overlies a crust on all but north facing aspects at treeline and above where a weak layer of surface hoar may be present.

A persistent weak layer of facets are sitting on top of a second buried crust down 80 to 180 cm. This layer is unlikely to human trigger in areas where a thick crust below the recent snow is present.

Weather Summary

Tuesday Night

Mostly cloudy with flurries, 5 to 15 cm snow. 30 to 40 km/h southwest ridgetop wind. Treeline temperature 0° C. Freezing level 2000 m.

Wednesday

Mix of sun and cloud with isolated flurries, 0 to 5 cm snow. 10 to 20 km/h west ridgetop wind. Treeline temperature -1° C. Freezing level 1800 m.

Thursday

Cloudy with isolated flurries, 0 to 5 cm snow. 20 to 30 km/h east ridgetop wind. Treeline temperature -2° C. Freezing level 1700 m.

Friday

Mix of sun and cloud with isolated flurries, 0 to 5 cm snow. 10 to 20 km/h east ridgetop wind. Treeline temperature 1° C. Freezing level 2200 m.

Check out the Mountain Weather Forecast for additional weather information.

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.
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.

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.