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Avalanche Forecast

Archived

Dec 23rd, 2024–Dec 24th, 2024

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

Regions

Northwest Coastal, Kitimat, Nass, Rupert, Seven Sisters, Shames, Stewart, Howson, Microwave-Sinclair.

Continually assess conditions as you move through terrain and be prepared to dial back objectives.

Whumphing, shooting cracks and avalanches are indicators of unstable conditions.

Confidence

Low

Avalanche Summary

On Sunday several natural wind slab avalanches were reported in the north of the region. These avalanches were up to size 3  and on northerly aspects in the alpine.

No new avalanches were reported in the south of the region where observations are limited.

Snowpack Summary

By 4 pm on the 24th  up to 20 cm of new snow may have fallen. This new snow will fall on an already heavily wind affected upper pack in the alpine and at treeline. Below treeline the snow surface is moist.

Two weak layers exist in the top meter of the snowpack from earlier in December. A layer of facets and/or surface hoar down 20 to 40 cm and a crust down 40 to 80 cm.

Treeline snow depth range from 200-280 cm. The lower snowpack has no layers of concern.

Weather Summary

Monday Night

Cloudy with around 5 cm of snow. 20 to 40 km/h east ridgetop wind. Treeline temperature -2 °C. Freezing level around 1000 m.

Tuesday

Mostly cloudy with 5 to 15 cm of snow. 20 to 50 km/h southeast ridgetop wind. Freezing level around 1200 m.

Wednesday

Cloudy with 5 to 15 cm of snow. 30 to 50 km/h southeast ridgetop wind. Freezing level rising to 1500 m.

Thursday

Mostly cloudy with around 15 cm of snow. 25 to 50 km/h southeast ridgetop wind. Freezing level around 1100 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Don't let storm day fever lure you into consequential terrain.
  • Be aware of the potential for large avalanches due to buried weak layers.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Recent wind has varied in direction, so watch for wind slabs on all aspects.

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.