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Avalanche Forecast

Archived

Apr 20th, 2025–Apr 21st, 2025

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

Regions

Lizard-Flathead, South Rockies, Akamina, Flathead, Lizard, Crawford, Moyie, St. Mary, Bull, Crowsnest North, Crowsnest South, Elkford East, Elkford West.

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

Confidence

Moderate

Avalanche Summary

No new avalanches were reported on Saturday.

NOTE: Observations are currently very limited in this region.

Snowpack Summary

Up to 15 cm of recent snow and moderate variable wind may have formed wind slabs on lee slopes at upper elevations.

This snow overlies a robust crust everywhere except northerly aspects at upper elevations, where previous snow surfaces may have remained dry.

The mid/lower snowpack is well settled and strong.

Lower elevations are melting out rapidly.

Weather Summary

Sunday Night

Coudy with flurries, 3 to 15 cm snow. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1500 m.

Monday

Mostly cloudy with isolated flurries, 0 to 5 cm snow. 20 to 30 km/h west ridgetop wind. Treeline temperature -2 °C. Freezing level 1800 m.

Tuesday

Mostly sunny. 10 to 20 km/h west ridgetop wind. Treeline temperature 0 °C. Freezing level 2000 m.

Wednesday

Mix of sun and cloud. 5 to 10 km/h west ridgetop wind. Treeline temperature 1 °C. Freezing level 2100 m.

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-affected areas where triggering slabs is more likely.
  • Recent wind has varied in direction, so watch for wind slabs on all aspects.

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.