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Archived

Avalanche Forecast

Mar 22nd, 2024–Mar 23rd, 2024
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Bonnington, Crawford, Grohman, Kokanee, Kootenay Boundary, Kootenay Pass, Moyie, Norns, Rossland, St. Mary, Valhalla, Ymir.

Cooling temperatures are reducing the likelihood of triggering large persistent slab avalanches.

Avoid steep or convex terrain features with a shallow or thin-to-thick snowpack.

Confidence

Moderate

Avalanche Summary

A skier triggered size 1 persistent slab avalanche was reported on a north aspect at treeline near Nelson on Thursday. It failed on a weak layer of surface hoar down 25 cm.

Snowpack Summary

0 to 5 cm of recent snow overlies predominantly crusty surfaces.

A weak layer of surface hoar is down 30-60 cm in isolated, sheltered areas at treeline.

A widespread crust with sugary facets above is buried 80-180 cm deep. Steep or convex terrain features with a shallow or thin to thick snowpack at treeline and above are the most likely places to trigger this layer. However, when a thick surface crust is present, human triggering this layer is unlikely.

Weather Summary

Friday night

Cloudy. 5 to 10 km/h south ridgetop wind. Treeline temperature -3 °C. Freezing level 1400 m.

Saturday

Cloudy with isolated flurries, 0 to 10 cm snow. 5 to 10 km/h east ridgetop wind. Treeline temperature -2 °C. Freezing level 1600 m.

Sunday

Mix of sun and cloud. 10 to 20 km/h northeast ridgetop wind. Treeline temperature -5 °C. Freezing level 1500 m.

Monday

Mix of sun and cloud. 5 to 10 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1600 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
  • Avalanche hazard may have improved, but be mindful that deep instabilities are still present.
  • Cornice failure may trigger large avalanches.

Avalanche Problems

Persistent Slabs

A crust with weak 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 most likely places to trigger this layer.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3