Avalanche Forecast

Issued: Nov 22nd, 2024 4:00PM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Wind Slabs.

Avalanche Canada Avalanche Canada, Avalanche Canada

Avalanches are most likely to fail on steep, wind-loaded slopes, especially near ridgetops.

Summary

Confidence

Moderate

Avalanche Summary

Wednesday: North of Stewart, recent extreme winds resulted in a natural cycle of size 1.5 to 2.5 wind slab avalanches. They occurred on leeward north through east faces. Shooting cracks, which are a sign of instability, were also reported in wind slabs by snowmobilers. These slabs may stay reactive to human triggering for several days.

Early season reports have been extremely limited. Please consider submitting your observations to the Mountain Information Network.

Snowpack Summary

Expect to find sastrugi and hard wind-scoured surfaces in all open wind-exposed areas at upper elevations. Thick wind slabs have formed on many lee slopes.
A rain crust from early November is buried 50 to 100 cm deep in the alpine. In isolated, sheltered areas, a layer of surface hoar may be found 60 cm+ deep.
Snow depths vary across the region but generally range from 100 to 200 cm in the alpine and about 50 cm at 1000 m.

Weather Summary

Friday Night

Mostly cloudy with 0 to 2 cm of snow. 60 to 80 km/h southeast wind. Treeline temperature -8°C.

Saturday

Cloudy with 0 to 2 cm of snow. 40 to 50 km/h southeast wind. Treeline temperature -9 °C.

Sunday

Partly cloudy. 30 to 40 km/h east wind. Treeline temperature high -8 °C.

Monday

Mostly sunny. 10 to 20 km/h variable wind. Treeline temperature high -10 °C

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Keep your guard up at all elevations. Wind slab formation has been extensive and could extend into openings below treeline.
  • Avoid freshly wind-loaded features, especially near ridge crests, rollovers, and in steep terrain.
  • Seek out sheltered terrain where new snow hasn't been affected by wind.

Problems

Wind Slabs

An icon showing Wind Slabs

Recent strong to extreme easterly winds have created thick wind slabs on leeward slopes. It's a good idea to investigate before entering committing terrain. If in doubt, give these slabs a few days to bond.

Aspects: North, South East, South, South West, West, North West.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

1 - 2.5

Valid until: Nov 23rd, 2024 4:00PM

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