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Archived

Avalanche Forecast

Jan 18th, 2025–Jan 19th, 2025
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold

It's possible to remote-trigger very large avalanches from long distances away. Stick to simple terrain and avoid overhead slopes.

Check out this MIN report showcasing a recent avalanche.

 

Confidence

Moderate

Avalanche Summary

On Friday, skiers triggered a slab with a 1 m crown depth in the Big Y. Get more details here.

On Wednesday, a snowmobile remotely triggered a large (size 3) persistent slab avalanche from 100 m away near Bryant Lake. It was triggered from flat terrain at the col on an ENE aspect at 1500 m. The crown depth was 1 to 2 m, the width was 400 m and it ran 400 m down slope. It slid on the December facet/crust weak layer.

Heads up through the weekend, human-triggered avalanches remain likely.

Snowpack Summary

The last storm cycle on Thursday brought up to 40 cm of new snow with strong southwest winds. Northwest through southwest winds continue redistributing the storm snow, building thicker wind slabs on leeward slopes.

A persistent weak layer composed of facets overlying a crust is buried 50 to 100 cm deep and continues to be reactive with the new load from snow and wind.

Total snow depths are around 160 to 190 cm at treeline.

Weather Summary

Saturday Night

Mostly cloudy. 10 to 40 km/h southwest ridgetop wind. Treeline temperature -12 °C.

Sunday

Cloudy. 40 to 65 km/h southwest ridgetop wind. Treeline temperature -10°C.

Monday

Cloudy with up to 5 cm of snow. 80 gusting to 100 km/h southwest ridgetop wind. Treeline temperature -6.

Tuesday

Mostly cloudy. 20 to 40 km/h northwest ridgetop wind. Treeline temperature -10 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Remote triggering is a concern; avoid terrain where triggering overhead slopes is possible.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
  • In times of uncertainty, conservative terrain choices are our best defense.
  • Choose low-angled, sheltered terrain where new snow hasn't been wind-affected.

Avalanche Problems

Persistent Slabs

A reactive weak layer of facets over a crust is buried 60 to 100 cm deep. Remote triggering from afar is possible and it will produce large and destructive avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 3.5

Wind Slabs

Reactive wind slabs may exist. North-and east-facing slopes are very loaded with deep deposits of snow. Northwest winds could also load south-facing slopes this weekend.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1.5 - 2.5