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Avalanche Forecast

Archived

Dec 7th, 2022–Dec 8th, 2022

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 unlikely, human triggered possible.
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

Northwest Coastal, Kitimat, Nass, Rupert, Seven Sisters, Shames, Stewart, Howson, Ningunsaw.

As new snow and strong southerly winds build a slab above a weak layer avalanche activity will increase.

Confidence

Moderate

Avalanche Summary

No recent avalanches have been reported. Backcountry users should expect to see evidence of a natural avalanche cycle from strong winds within the storm at higher elevations. If you head out in the backcountry please support your community by submitting a MIN report!

Snowpack Summary

New snow has buried a layer of surface hoar, size 5-10 mm, and facets. Surface hoar overlies wind-hammered surfaces including scoured easterly slopes and hard slabs on west and south slopes.

A layer that formed in mid-November can be found down 70 to 100 cm deep at treeline and above. This layer consists of a crust below 1200 m and a layer of surface hoar above this elevation. This layer has not shown recent signs of instability.

The depth of the snowpack at treeline varies widely from 100 to 200 cm and tapers rapidly below treeline. Many early-season hazards such as rocks, stumps, and open creeks exist below treeline.

Weather Summary

Wednesday Night

Cloudy with flurries, 10 - 15 cm accumulation. Ridge winds southerly 40 to 60 km/h. Temperature -7 at 1500 m. Freezing levels 500 m.

Thursday

Cloudy with flurries, 5 - 10 cm accumulation. Valley bottom winds remain light but at ridgetop winds will be southerly 40 - 60 km/h. Temperature -6 at 1500 m. Freezing levels valley bottom.

Friday

Cloudy with sunny periods and isolated flurries, trace accumulation. Ridge winds southerly 25 to 40 km/h. Temperature -8 at 1500 m. Freezing levels valley bottom.

Saturday

Cloudy with sunny periods and isolated flurries, trace accumulation. Ridge winds south 20 to 35 km/h, Temperature -10 at 1500m. Freezing levels valley bottom.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Fresh wind slabs will likely form throughout the day, diligently watch for changing conditions.
  • The best and safest riding will be on slopes that have soft snow without any slab properties.

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.