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Archived

Avalanche Forecast

Mar 20th, 2025–Mar 21st, 2025
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate

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

Natural avalanches are expected as new snow and wind stress the snowpack.

Avoid any terrain with overhead hazard, persistent weak layers are capable of producing very large avalanches.

Confidence

Moderate

Avalanche Summary

Several natural persistent slab avalanches were reported on Monday, failing on the March surface hoar. Several stepped down to deeper weak layers producing avalanches up to size 3.

Snowpack Summary

20 cm or more of recent snow has accumulated over previously wind-affected surfaces and crusts on steep south-facing terrain.

Two layers of concern currently exist in the upper-mid snowpack. Surface hoar that formed in early March can be found 80 to 110 cm deep. Additionally, a layer of facets, surface hoar, and/or a crust from mid-February is buried 80 to 180 cm deep.

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

Weather Summary

Thursday Night

Cloudy with 0 to 5 cm of snow. 20 to 40 km/h southeast ridgetop wind. Treeline temperature -4 °C.

Friday

Cloudy with 0 to 5 cm of snow. 20 to 40 km/h south ridgetop wind. Treeline temperature -4 °C.

Saturday

Cloudy with up to 5 cm of snow. 30 to 50 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Sunday

Cloudy with flurries. 10 to 20 km/h southwest ridgetop wind. Treeline temperature -2 °C as freezing levels rise to 1200 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Minimize exposure during periods of heavy loading from new snow and wind.
  • Be aware of the potential for large avalanches due to buried weak layers.

Avalanche Problems

Persistent Slabs

New snow and wind will stress weak layers. Surface hoar and facets buried in the upper snowpack have produced recent avalanches. Large loads or step-downs could trigger the more deeply buried weak layers.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1.5 - 3

Storm Slabs

Expect deeper and more reactive deposits on north-facing slopes. Storm slabs may step down to wind-affected snow below or buried weak layers.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 1.5 - 2.5