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Avalanche Forecast

Archived

Dec 1st, 2023–Dec 2nd, 2023

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

Regions

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

Winter has returned! Be patient and avoid avalanche terrain while the storm snow settles. Early season hazards are still lurking below the surface.

Confidence

Moderate

Avalanche Summary

Expect avalanche activity to be widespread as this new storm dumps a large amount of snow over a thin, early season snowpack.

So far this season no avalanches have been reported on the Island.

Please consider filling out a MIN report if you are out in the backcountry.

Snowpack Summary

Up to 50 cm of new snow has introduced rapid change to the thin, early season snowpack. In the alpine and upper treeline the new snow could form rider triggerable storm slabs on specific slopes that are above threshold.

The new snow is falling on a variety of early season surfaces, including crusts and 5-15 cm of recent snow. Previously, snowpack height at treeline currently ranged from less than 30 cm at Mt Arrowsmith to around 50 cm in Strathcona Park to 30 cm at Mt Cain. Snowpack depths are deeper in areas that have been wind loaded like gullies and sheltered pockets below ridgelines. Below treeline was mostly snow free before this storm.

Weather Summary

Friday Night

Cloudy. 30-50 cm of new snow expected, possibly more on the west side of the island. Strong to Extreme southwest ridgetop wind. Freezing level rising to 1200 m.

Saturday

A mix of sun and cloud, trace of new snow expected. Strong northwest ridgetop wind, freezing level around 1000 m.

Sunday

Mostly cloudy, 10 cm of snow at high elevations, moderate rain up to 1750 m. Strong southwest ridgetop wind. freezing level rising to 2000 m in the morning during the heaviest precipitation, and falling back down to 1200 m in the afternoon.

Monday

Cloudy. Light to moderate rain, possibly heavy on the west side of the island. Strong to Extreme south or southwest ridgetop wind. Freezing level rising to 3000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be careful to keep storm day fever from luring you out into bigger terrain features.
  • Avoid terrain traps where the consequence of any avalanche could be serious.
  • Avoid areas with overhead hazard.

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.