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Avalanche Forecast

Archived

Mar 28th, 2024–Mar 29th, 2024

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

Regions

Bonnington, Grohman, Kootenay Pass, Norns, Ymir, Crawford, Moyie, St. Mary, Kokanee, Retallack, Valhalla.

Assess for slab properties in the new snow as you move through terrain.

Where the new snow feels stiff storm slabs are possible.

Confidence

Moderate

Avalanche Summary

Only small skier triggered dry loose avalanches were reported on Wednesday.

Snowpack Summary

10 to 20 cm of new snow may have been redistributed by southerly wind. This new snow overlies a crust  except on northerly aspects at upper elevation where surface hoar will likely be found. The snow surface will become moist at lower elevations.

A crust formed in mid March is down 20 to 50 cm. On north facing terrain this crust extends up to 1900 to 2200 m. Surface hoar may be found at this interface where a crust is not present.

A widespread crust with facets above is buried 80 to 180 cm deep. Steep or convex terrain features with a shallow or thin to thick snowpack at treeline and above are the places where it may still be possible to trigger this layer.

The snowpack has been melting out at low elevations. Check out this MIN.

Weather Summary

Thursday Night

Mostly cloudy with 5 to 10 cm of new snow. 10 to 20 km/h south alpine wind. Treeline temperature -4°C.

Friday

Mostly cloudy with up to 5 cm of new snow. 5 to 15 km/h southwest alpine wind. Freezing level rising to 1900 m.

Saturday

A mix of sun and cloud with trace amounts of new snow. 5 to 10 km/h west alpine wind. Freezing level rising to 2000 m.

Sunday

Sunny. 20 to 30 km/h north alpine wind. Freezing level rising to 2100 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Investigate the bond of the recent snow before committing to your line.
  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.

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.