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Avalanche Forecast

Archived

Feb 26th, 2025–Feb 27th, 2025

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
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.
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.

Dangerous avalanche conditions continue.Avoid large slopes, overhead hazards and steep terrain.

Confidence

Moderate

Avalanche Summary

On Tuesday, reports saw numerous wet loose avalanches (up to size 2.5) primarily from south facing slopes and all aspects below treeline. Explosive control produced one persistent slab (size 1.5) at treeline on a southeast aspect and several wind slabs (size 1 to 1.5) which were remotely triggered from 400 m away.

Natural and human triggered slab avalanches are very likely on Thursday.

Snowpack Summary

15 to 30 cm of new snow and strong southerly wind is expected by Thursday morning.

The upper metre of the snowpack is complicated. This snow sits above several significant weak layers that formed during the January and February dry spells. These include facets, surface hoar (in sheltered terrain), and crust on solar aspects. These layers are currently reactive.

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 also remains a concern in this region.

Weather Summary

Wednesday Night

New snow 10 to 20 cm. 15 gusting to 65 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1100 m.

Thursday

Mix of sun and cloud with snow 5 to 10 cm. 20 to 55 km/h southeast ridgetop wind. Treeline temperature -3 °C. Freezing level 1000 m.

Friday

Snow 5 to 10 cm. 10 to 50 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 900 m.

Saturday

Mix of sun and cloud. 10 km southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1100 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Keep in mind that human triggering may persist as natural avalanches taper off.

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.