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Avalanche Forecast

Archived

Apr 21st, 2026–Apr 22nd, 2026

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

Regions

Northwest Inland, Seven Sisters, Howson, Kispiox, Microwave-Sinclair, Ningunsaw, North Bulkley, South Bulkley, Telkwa.

Avalanche danger rises with sun and warming—start and finish early.

Use extra caution in large alpine terrain; deeply buried weak layers may persist.

Confidence

Low

  • 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 a limited number of field observations.

Avalanche Summary

No new avalanches reported.

We suspect the current weather is driving the avalanche danger in the afternoons, producing wet loose avalanches up to size 2.

Large (up to size 3) persistent slab avalanches have been reported periodically over the past couple of weeks, likely during periods of warming, solar radiation, and/or wind loading. The most recent report occurred within the past few days on an east aspect at approximately 1700 m (see photo below for details).

Snowpack Summary

A melt freeze crust likely exists in terrain at treeline and above, except in high-alpine terrain, particularly on north aspects, where dry, wind-affected snow may persist. At lower elevations, limited overnight refreezing is likely to result in a moist or isothermal upper snowpack. With daytime warming and sun, the upper snowpack will weaken throughout the day.

A layer of weak, sugary snow over a thick crust is buried 100 to 200 cm and continues to produce large, surprising avalanches.

Weather Summary

Tuesday Night
Mostly clear skies. 30 km/h northwest ridgetop wind. Treeline temperature -3 °C.

Wednesday
Sunny. 40 km/h northwest ridgetop wind. Treeline temperature -2 °C.

Thursday
Sunny. 30 km/h northwest ridgetop wind. Treeline temperature -1 °C. Freezing level 1800 m.

Friday
Sunny. 20 km/h east ridgetop wind. Treeline temperature 3 °C. Freezing level 2000 m.




More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Think carefully about your exit plan from the backcountry because avalanche danger is expected to increase throughout the day.
  • Back off slopes as the surface becomes moist or wet with rising temperatures.
  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.
  • The likelihood of deep persistent slab avalanches will increase with each day of warm weather.

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

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.