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Avalanche Forecast

Archived

Mar 1st, 2026–Mar 2nd, 2026

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

Regions

Northwest Inland, Nass, Seven Sisters, Howson, Kispiox, Ningunsaw.

Stick to conservative slopes free from overhead hazard during strong winds, or heavy snowfall.

Natural avalanches are possible during strong winds.

Confidence

Moderate

  • We are uncertain due to a limited number of field observations.
  • We are confident that there are persistent slabs in the snowpack, but uncertain about how likely they are to trigger.

Avalanche Summary

Explosive control work on Saturday produced slabs up to size 2.5 on all aspects, and a recent natural cycle was observed up to size 3.

With strong winds forecast to continue, another natural cycle may occur.

Snowpack Summary

Another 30 cm of snow is expected by Monday afternoon, bringing recent storm totals to 60–90 cm. Strong southwest winds are redistributing the new snow, building deeper slabs on north and east aspects while scouring windward slopes back to old crusts. In sheltered terrain, storm snow may be sitting on surface hoar or a sun crust.

Crust, facet, and spotty surface hoar layers exist in the upper 1.5 metres of the snowpack. These layers are most concerning at treeline and below, especially where the snowpack is shallow.

Below, the remaining snowpack is generally well settled and bonded.

Weather Summary

Sunday Night
Cloudy. 5 to 15 cm of snow. 60 km/h southwest ridgetop wind. Treeline temperature -6 °C.

Monday
Cloudy. 5 to 15 cm of snow. 60 km/h southwest ridgetop wind. Treeline temperature -4 °C.

Tuesday
Cloudy. 10 to 20 cm of snow. 50 km/h southwest ridgetop wind. Treeline temperature -2 °C.

Wednesday
Mostly cloudy. 5 to 20 cm of snow. 50 km/h southwest ridgetop wind. Treeline temperature -1 °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.
  • Stay off recently wind loaded slopes until they have had a chance to stabilize.
  • Be aware of the potential for large avalanches due to buried weak layers.

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.