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Archived

Avalanche Forecast

Apr 21st, 2025–Apr 22nd, 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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low

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

Weak layers in the snowpack continue to be a concern. A cautious approach is recommended, especially in high-elevation, north terrain where the snowpack remains most complex.

Confidence

Moderate

Avalanche Summary

On Sunday, cornice failures triggered two very large (3-5) natural persistent slab avalanches. There were multiple step-downs visible in the crowns, and these avalanches likely failed on the weak layers formed in February and March.

Cornices continue to be a prime suspect for triggering large, destructive avalanches.

Snowpack Summary

A widespread surface crust formed following last week's warming event. At upper elevations, moderate to strong southwest winds will continue to redistribute new snow in exposed terrain.

Three layers of note currently exist in the mid-snowpack and still have the potential to cause large avalanches:

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

  • Another layer of surface hoar that formed in early March buried 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.

Weather Summary

Monday night

Cloudy with up to 5 cm of new snow. 30 to 50 km/h northwest ridgetop wind. Treeline temperature -4 °C. Freezing level 700 m.

Tuesday

Cloudy with up to 5 cm of new snow. 30 to 60 km/h southwest ridgetop wind. Treeline temperature -0 °C. Freezing level rises to 1300 m.

Wednesday

Cloudy with up to 5 cm of new snow. 20 to 50 km/h southwest ridgetop wind. Treeline temperature +1 °C. Freezing level rises to 1500 m.

Thrusday

A mix of sun and cloud. 30 to 50 km/h south ridgetop wind. Treeline temperature +2 °C. Freezing level rises to 1900 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for large, destructive avalanches due to deeply buried weak layers.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Limit exposure to steep, sun exposed slopes, especially when the solar radiation is strong.

Avalanche Problems

Persistent Slabs

Weak layers from February and March remain reactive in the snowpack, but likely need a heavy trigger to cause a failure. These layers are most likely to be triggered on high north-facing terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2.5 - 5

Wind Slabs

Recently formed wind slabs may be reactive to human triggers.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 1.5