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Archived

Avalanche Forecast

Jan 29th, 2025–Jan 30th, 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
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.

Conditions will remain dangerous after the storm. The new snow needs time to strengthen.

Confidence

Moderate

Avalanche Summary

Wednesday's storm likely caused a natural avalanche cycle, particularly in wind-affected alpine terrain. Moving forward, triggering storm slabs will be the primary concern, especially on slopes where they bond poorly to underlying surface hoar or crusts.

Snowpack Summary

20 to 40 cm of snow fell on Wednesday, with southwest winds depositing more in lee areas. This new snow may bond poorly to underlying layers, which could include:

  • Large surface hoar crystals in sheltered spots at treeline and below

  • Crusts on solar slopes

  • Old wind-affected snow

A layer of surface hoar from early January is buried 20 to 40 cm deep, though it's uncertain whether this layer will persist.

100 to 200 cm deep in the snowpack are layers of crust, facets, and possibly surface hoar that were buried in December.

Weather Summary

Wednesday Night

Cloudy with up to 5 cm of snow. 50 km/h west ridgetop wind. Treeline temperature -8 °C.

Thursday

Sunny. 10 km/h variable ridgetop wind. Treeline temperature -10 °C.

Friday

Cloudy with 5 to 10 cm of snow. 20 km/h southeast ridgetop wind. Treeline temperature -12 °C.

Saturday

Mix of sun and cloud. 30 km/h northeast ridgetop wind. Treeline temperature -15 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Use conservative route selection. Choose simple, low angle terrain with no overhead hazard.
  • Fresh snow rests on a problematic persistent slab, don't let good riding lure you into complacency.
  • Investigate the bond of the recent snow before committing to your line.

Avalanche Problems

Storm Slabs

20 to 40 cm of fresh snow may bond slowly to underlying layers. Storm slabs could be extra deep and reactive on wind-loaded features.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2.5

Persistent Slabs

The 100 to 200 cm deep weak layer from early December is becoming difficult to trigger.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely

Expected Size: 2 - 3