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Archived

Avalanche Forecast

Apr 12th, 2025–Apr 13th, 2025
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
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
3: Considerable
The avalanche danger rating in the alpine will be considerable
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Howson, Kitimat, Nass, Rupert, Seven Sisters, Shames.

Increasing wind and forecast heavy snowfall amounts have raised the avalanche danger.

Before venturing into challenging and complex terrain, give the new snow time to settle and bond.

Confidence

Moderate

Avalanche Summary

On Friday north of the sleeping beauty provincial park. Ski cutting produced a few small (size 1) wind slab avalanches with one large (size 2) remotely triggered persistent slab avalanche reported.

If you do head out in the mountains, please share your observations on the Mountain Information Network.

Snowpack Summary

Up to 35 cm of new snow is present on the surface above 1500 m and has buried a melt freeze crust. Past strong southerly winds has likely transported available snow, promoting wind slab development.

Dry snow exists on northerly aspects at upper elevations.

Below 1100 m the snowpack is wet and unconsolidated.

Three persistent weak layers remain notable in the snowpack.

  • Surface hoar that formed in mid-March can be found 50 to 100 cm below the snow surface.

  • A layer of surface hoar that formed in early March can be found at a depth of 100 to 150 cm.

  • A layer of facets, surface hoar, and/or a crust from mid-February is buried 100 to 200 cm deep.

At elevations below treeline, the snow pack is rain saturated and isothermal.

Weather Summary

Saturday Night

Mostly cloudy with 5 to 10 cm of snow. 30 to 60 km/h southwest ridgetop wind. Treeline temperature -1°C. Freezing level 1000 m.

Sunday

Cloudy with up to 15 cm snow. 50 to 70 km/h southwest ridgetop wind. Treeline temperature 0°C. Freezing level 1600 m.

Monday

Cloudy with up to 15 cm snow. 50 to 70 km/h southwest ridgetop wind. Treeline temperature 0°C. Freezing level 1600 m.

Tuesday

Cloudy with flurries. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -3°C. Freezing level 700 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be careful as you transition into wind-affected terrain.
  • Be aware of the potential for large avalanches due to buried weak layers.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.

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

Weak layers of surface hoar and facets in the upper snowpack have recently produced large avalanches. Surface instabilities or large triggers may step down to these deeper layers.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 3.5