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Avalanche Forecast

Archived

Apr 19th, 2025–Apr 20th, 2025

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
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.

Regions

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

15 to 30 cm of forecast snow may form slabs reactive to human triggers on Sunday.

Treat hazard as Considerable in localized areas that receive more than 20 cm of new snow.

Confidence

Moderate

Avalanche Summary

No new avalanches were reported on Friday.

NOTE: Observations are currently very limited in this region.

Snowpack Summary

15 to 30 cm of forecast snow may form storm slabs sitting on a crust.

The mid/lower snowpack is well settled and strong.

Lower elevations are melting out rapidly.

Weather Summary

Saturday Night

Snow, 10 to 20 cm(above 1300 m). 10 to 20 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1700 m.

Sunday

Snow, 15 to 30 cm(above 1300 m). 10 to 20 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1700 m.

Monday

Cloudy with isolated flurries, 0 to 5 cm snow. 20 to 30 km/h west ridgetop wind. Treeline temperature -4 °C. Freezing level 1600 m.

Tuesday

Mix of sun and cloud. 5 to 10 km/h west ridgetop wind. Treeline temperature 0 °C. Freezing level 2000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • Dial back your terrain choices if you are seeing more than 20 cm of new snow.
  • Use small, low consequence slopes to test the bond of the new snow.
  • The best and safest riding will be on slopes that have soft snow without any slab properties.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.

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.