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Avalanche Forecast

Archived

Apr 7th, 2025–Apr 8th, 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 possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Lizard-Flathead, Flathead, Lizard, Crawford, Moyie, St. Mary.

Small but reactive storm slabs may build over the day. The best conditions will be found at high elevations, well above the freezing line.

Carefully assess your line before committing.

Confidence

Moderate

Avalanche Summary

Over the weekend, small wet loose avalanches were reported to size 1.

Looking forward, we expect small avalanches to continue to be possible in rain saturated terrain, but likely at elevations that receive new snow.

Snowpack Summary

Snowfall totals may reach 15 cm in higher terrain, sitting over a crust or moist snow. Surface snow at lower elevations is expected to remain wet.

The remainder of the snowpack is generally well settled.

Weather Summary

Monday Night

Cloudy with 5 cm of snow possible above 2000 m. 30 to 50 km/h southwest ridgetop wind. Freezing level lowers to 1500 m by morning.

Tuesday

Cloudy with 5 to 10 cm of snow. 20 to 30 km/h southwest ridgetop wind. Freezing level around 1800 m. Treeline temperature -2 °C.

Wednesday

Partly cloudy. 20 to 30 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 2000 m.

Thursday

Clear skies with 20 to 30 km/h southwest ridgetop winds. Freezing levels rise towards 2500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for fresh storm slabs building throughout the day.
  • Cornices often break further back than expected; give them a wide berth when traveling on ridgetops.

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.