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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 unlikely, human triggered possible.

Regions

Northwest Coastal, Northwest Inland, Boundary, Stewart, Kispiox, Ningunsaw, Ningunsaw, Ningunsaw.

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

40 to 80 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.

A couple of layers of surface hoar buried in January exist in the top meter of the snowpack at treeline and below.

Deeper in the snowpack, a weak layer of facets and a crust from early December varies in depth from 100 to 300 cm. This layer remains a concern in this region.

Weather Summary

Monday night

Mostly cloudy with a trace of snow. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -4 °C.

Tuesday

Mostly cloudy with 2 to 5 cm of snow. 25 to 35 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1000 m.

Wednesday

Cloudy with 10 to 20 cm of snow. 50 to 60 km/h south ridgetop wind. Treeline temperature 0 °C. Freeing level 1400 m.

Thursday

Cloudy with 5 to 10 cm of snow. 40 to 60 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freeing 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.
  • Choose low-angled, sheltered terrain where new snow hasn't been wind-affected.

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.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.