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Archived

Avalanche Forecast

Apr 13th, 2025–Apr 14th, 2025
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Boundary, East Stikine, Kispiox, Ningunsaw, Northwest Coastal, Northwest Inland, Stewart, West Stikine.

Wind slabs are expected to remain reactive to human triggers, especially in lee features.

Avoid areas where the snow is wind effected.

Confidence

Moderate

Avalanche Summary

Over the past week, explosive-controlled avalanches up to size 3 have been reported daily, involving cornice failures, wind slabs, and wet loose.

Last Friday, a failing cornice triggered a size 3 avalanche on an eastern slope in the alpine. This avalanche is believed to have occurred on the March 5th surface hoar layer.

Where a thick, supportive surface crust is found, we expect that triggering avalanches on buried weak layers is unlikely.

Snowpack Summary

5 to 25 cm of new snow sits on variably wind affected snow in open terrain at upper elevations. A crust is found up to 1800 m and higher on solar slopes.

Three layers of note currently exist in the upper-mid snowpack.

  • A layer of surface hoar and a crust that formed in mid-March can be found 50 to 80 cm below the snow surface.

  • Another layer of surface hoar that formed in early March can be found at a depth of 70 to 120 cm.

  • A layer of facets, surface hoar, and/or a crust from mid-February is buried 120 to 200 cm deep.

The remainder of the snowpack is well consolidated, and there are no current concerns.

Weather Summary

Sunday Night

Cloudy with 0 to 5 cm of snow. 20 to 50 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 900 m.

Monday

Cloudy with up to 10 cm of snow. 30 to 50 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 1100 m.

Tuesday

Partly cloudy. 40 to 70 km/h southwest ridgetop wind. Treeline temperature -3°C. Freezing level 1000 m.

Wednesday

Mix of sun and cloud. 10 to 30 km/h southwest ridgetop wind. Treeline temperature -3°C. Freezing level 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Be aware of the potential for large, destructive avalanches due to deeply buried weak layers.
  • Cornice failures could trigger large and destructive avalanches.
  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.

Avalanche Problems

Wind Slabs

Expect wind slab development on north aspect terrain, near and below ridge crests.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2

Persistent Slabs

Several weak layers persist in the snowpack. These layers are most likely to be reactive at upper elevations where no surface crust has formed. Surface instabilities or large triggers may step-down to these deeper layers.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3.5