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Avalanche Forecast

Archived

Apr 12th, 2026–Apr 13th, 2026

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

Regions

Northwest Coastal, Northwest Inland, Boundary, Kitimat, Nass, Rupert, Seven Sisters, Shames, Stewart, Howson, Kispiox, Ningunsaw.

The track and intensity of the incoming weather system are uncertain.

Hot spots up to 30 cm possible.

Where wind driven snow exceeds 20 cm, the avalanche danger is CONSIDERABLE.

Confidence

Moderate

  • We are confident that there are persistent slabs in the snowpack, but uncertain about how likely they are to trigger.
  • We are uncertain due to the track and intensity of the incoming weather system.

Avalanche Summary

While details are lacking, a large (~size 3) persistent slab avalanche was remotely triggered on a north-facing alpine slope on Friday. I appeared to occur on a steep, rocky slope with a thin-to-thick snowpack.

Wet loose avalanches continue to be reported daily with the recent warm temperatures and strong sun. With cooler, cloudy conditions this trend is expected to taper.

Snowpack Summary

Up to 20 cm is possible by end of day Monday. This new snow will bury crusty surfaces across most terrain, except in high alpine north-facing areas, where dry, wintry snow can still be found, and isolated wind slabs may linger. On solar aspects and lower elevations, surface crusts are less robust and possibly breakable and/or moist snow.

Several persistent weak layers are buried up to 250 cm deep. While triggering these layers is becoming unlikely, they present a low-probability, high-consequence problem. A cornice fall (large load) may be enough to trigger this slab.

Weather Summary

Sunday Night
Mostly cloudy. 2 to 5 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1000 m.

Monday
Cloudy. 5 to 10 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -4 °C.

Tuesday
Mostly cloudy. 10 to 15 cm of snow. 30 km/h south ridgetop wind. Treeline temperature -4 °C.

Wednesday
Mix of sun and clouds. 1 to 5 cm of snow. 20 km/h south ridgetop wind. Treeline temperature -4 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Be aware of the potential for large, destructive avalanches due to deeply buried weak layers.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.