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Avalanche Forecast

Archived

Mar 31st, 2024–Apr 1st, 2024

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

Regions

Kootenay Boundary, Bonnington, Grohman, Kootenay Pass, Norns, Rossland, South Okanagan, Ymir, Crawford, Moyie, St. Mary, Kokanee, Retallack, Valhalla.

Numerous large rider triggered avalanches have been reported in recent days.

Choose conservative terrain and avoid overhead hazards.

Confidence

High

Avalanche Summary

Numerous rider triggered storm slab avalanches up to size 2 were reported on primarily north and east aspects at treeline and above on Saturday. The Nelson area has been a hot spot for recent human triggered avalanches.

Numerous naturally triggered wet loose avalanches up to size 2 were also reported throughout the region.

Snowpack Summary

Strong solar radiation has formed a surface crust everywhere except north facing terrian at upper elevations.

30 to 50 cm of recent snow overlies a crust on all but north facing aspects at treeline and above where a weak layer of surface hoar may be present.

A persistent weak layer of facets are sitting on top of a second buried crust down 100 to 180 cm. This layer is unlikely to human trigger in areas where a thick crust below the recent snow is present. However, steep or convex terrain features with a shallow or thin to thick snowpack at treeline and above are the most likely places where it may be possible to trigger this layer with large loads.

Weather Summary

Sunday Night

Clear skies. 10 to 20 km/h northwest ridgetop wind. Treeline temperature 2° C. Freezing level 2300 m.

Monday

Sunny. 20 to 30 km/h northwest ridgetop wind. Treeline temperature 5° C. Freezing level 2600 m.

Tuesday

Sunny. 20 to 30 km/h southwest ridgetop wind. Treeline temperature 8° C. Freezing level 3000 m.

Wednesday

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

Check out the Mountain Weather Forecast for additional weather information.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
  • The more the snowpack warms-up and weakens, the more conservative you`ll want to be with your terrain selection.
  • If triggered loose wet avalanches may step down to deeper layers resulting in larger avalanches.
  • Cornice failure may trigger large avalanches.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

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.