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Avalanche Forecast

Archived

Feb 24th, 2025–Feb 25th, 2025

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

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

Recent storm slabs are likely to remain reactive. Stick to conservative terrain and avoid overhead hazard.

Confidence

Moderate

Avalanche Summary

Observations have been limited by poor visibility through the storm. Natural and explosive triggered avalanches up to size 2 have been reported over the weekend; storm and wind slabs at upper elevations and loose wet below treeline.

Looking forward, human-triggered avalanches will remain likely as natural activity subsides.

Snowpack Summary

30 to 60 cm of recent storm snow overlies hard surfaces in wind exposed areas, facets and surface hoar in sheltered terrain, and crust on low elevation solar aspects.

Two layers of surface hoar from January can be found in the top meter of the snowpack.

A layer of facets on top of a crust from early December is buried 100 to 200 cm deep. This layer is generally not a concern in this region.

Weather Summary

Monday night

Partly cloudy. 20 to 30 km/h southeast ridgetop wind. Treeline temperature -2 °C. Freezing level 1200 m.

Tuesday

Mostly cloudy with 2 to 5 cm of snow above 1000 m, light rain below. 20 to 40 km/h southwest ridgetop wind. Treeline temperature -1 °C. Freezing level 1200 m.

Wednesday

Mostly cloudy with 10 to 15 cm of snow above 1300 m, light rain below. 80 to 90 km/h south ridgetop wind. Treeline temperature +1 °C. Freezing level 1500 m.

Thursday

Mostly cloudy with 10 to 15 cm of snow above 1000 m, light rain below. 60 to 80 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 1200 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Keep in mind that human triggering may persist as natural avalanches taper off.
  • Be aware of the potential for large avalanches due to buried surface hoar.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.