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Archived

Avalanche Forecast

Feb 16th, 2024–Feb 17th, 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, Kootenay Boundary, Kootenay Pass, Moyie, Norns, Rossland, South Okanagan, St. Mary, Ymir.

Utilize small-scale features to assess how the new snow is bonding, before progressing to larger terrain.

Confidence

Moderate

Avalanche Summary

On Thursday explosive testing triggered wind slab avalanches on south aspect terrain. This produced large (size 2) wind slab avalanches that subsequently remotely trigged another large (size 2) avalanche.

On Wednesday near the Nelson area, a large (size 2) skier-triggered avalanche on a southwest aspect occurred following a period of moderate north east winds.

Snowpack Summary

10 to 20 cm of recent snow combined with winds from all directions has transported this snow and formed wind slabs that have been reactive to skier triggering. 10 to 20 cm of recent storm snow sits on a layer of small surface hoar which may lurk in sheltered areas. In some places, the new snow and surface hoar sits on a thin sun crust.

A thick rain crust from early February is now buried 30 to 40 cm deep and seems well-bonded at lower elevations.

Crusts and facets in the mid and lower snowpack can still be found in isolated pockets.

Weather Summary

Friday Night

Mostly clear skies. 10 to 20 km/h north ridgetop wind. Treeline temperature -16 °C.

Saturday

Mostly clear skies. 10 to 20 km/h southeast ridgetop wind. Treeline temperature -3 °C.

Sunday

Mostly clear skies. 20 to 50 km/h southeast ridgetop wind. Treeline temperature -3°C.

Monday

Clear skies becoming cloudy in the afternoon. 15 to 30 km/h southwest ridgetop wind. Treeline temperature -3 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks or recent avalanches.
  • Investigate the bond of the recent snow
  • Start with conservative lines and watch for clues of instability.

Avalanche Problems

Wind Slabs

Expect recently formed wind slab avalanches to be found just below ridge tops and at the bottom of steep features.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2