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Avalanche Forecast

Archived

Apr 10th, 2025–Apr 11th, 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.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

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

If there is a thick surface crust, avalanches are unlikely. Storm slabs may still be rider-triggered on high, shaded aspects.

Confidence

Low

Avalanche Summary

On Thursday, there were two large wet loose avalanches (size 3) north of Kaslo on a west aspect in the alpine and at treeline. As well as several small wet loose avalanches.

On Wednesday, a few large storm slabs were reported near Fernie (size 1.5 and 2).

Avalanche activity is expected to subside on Friday as temperatures cool off.

Snowpack Summary

A surface crust is expected to form Thursday night. The thicker it is, the less likely avalanches are. Alpine slopes that didn't see the sun may not have a crust and still hold around 20 cm of soft snow from earlier in the week. Low elevations are melting out and becoming wet. There are layers of weak crystals buried in January, February, and March that can be found in the mid and lower snowpack, but there hasn't been recent avalanche activity on these layers.

Weather Summary

Thursday Night

Cloudy with 1 to 2 mm of rain. 40 to 60 km/h southwest ridgetop wind. Treeline temperature 3 °C. Freezing level falling to 2000 m.

Friday

Mostly cloudy. 20 to 40 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 2100 m.

Saturday

Mostly cloudy with 5 to 10 cm of snow. 20 to 30 km/h northwest ridgetop winds. Treeline temperature -3 °C. Freezing level 1700 m.

Sunday

Sunny. 10 km/h west ridgetop winds. Treeline temperature -4 °C. Freezing level 2000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Keep your guard up as storm slabs may remain sensitive to human triggering.
  • Back off slopes as the surface becomes moist or wet with rising temperatures.

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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.