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Avalanche Forecast

Archived

Dec 23rd, 2024–Dec 24th, 2024

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

Regions

Vancouver Island, East Island, North Island, South Island, West Island.

Carefully assess conditions

Storm slabs will be largest and most reactive where precipitation has predominantly fallen as snow

There is uncertainty in the freezing level during the storm

Confidence

Low

Avalanche Summary

No new avalanches have been reported in several days.

Observations have been limited. Please consider sharing your observations through the Mountain Information Network.

Snowpack Summary

By mid day on the 24th  up to 50 mm of precipitation may have fallen. In the alpine much of this precipitation will fall as snow and be accompanied by strong southerly winds. At treeline precipitation will initially fall as rain and switch to snow in the early morning. Below treeline most of this precipitation will likely fall as rain further melting the snowpack.

Snowpack depths at treeline vary from 200 to 250 cm.

Weather Summary

Monday Night

Cloudy with 15 to 30 mm of mixed precipitation. 40 to 70 km/h southeast ridgetop wind. Freezing level rising to 1700 m.

Tuesday

Cloudy with 10 to 20 mm of mixed precipitation. 30 to 60 km/h southwest ridgetop wind. Freezing level around 1200 m.

Wednesday

Cloudy with 10 to 100 mm of mixed precipitation  with the greatest values on the west side of the island. 40 to 70 km/h southeast ridgetop wind. Freezing level around 1400 m.

Thursday

Mostly cloudy with 10 to 50 mm of mixed precipitation with the greatest values on the west of the island. 20 to 40 km/h west ridgetop wind. Freezing level rising to 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Keep your guard up as storm slabs may remain sensitive to human triggering.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • 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.