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Avalanche Forecast

Archived

Apr 7th, 2025–Apr 8th, 2025

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

Regions

Kootenay Boundary, Bonnington, Grohman, Kootenay Pass, Norns, Rossland, Ymir, Kokanee.

Storm slabs will continue to build over the day.

Step back into conservative terrain in areas that have seen more than 30 cm of new snow.

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 30 cm in higher terrain, sitting over a crust or moist snow. Surface snow at lower elevations is expected to remain wet.

The upper snowpack is wet with several softening crusts. Several weak layers from early March, mid-February, and late January can be found in the mid and lower snowpack.

The remainder of the snowpack is generally well settled.

Weather Summary

Monday Night

Cloudy with 10 to 20 cm of wet snow or rain. Freezing level lowers from 2000 m to 1500 m overnight. 30 to 40 km/h southwest ridgetop wind.

Tuesday

Cloudy with 5 to 15 cm of snow above 1500 m. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -1 °C. Freezing level around 1800 m.

Wednesday

Mostly cloudy with flurries. 10 to 20 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level around 2000 m.

Thursday

Clearing skies with 30 to 40 km/h southerly ridgetop winds. Freezing level reaches 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.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Be alert to conditions that change with elevation, aspect, and exposure to wind.
  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.

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.