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Avalanche Forecast

Archived

Apr 1st, 2025–Apr 2nd, 2025

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

Regions

Microwave-Sinclair, North Bulkley, South Bulkley, South Bulkley, South Bulkley, Telkwa.

Avoid slopes that have corniced ridgelines. Cornice failure may trigger large, persistent slab avalanches on the slope below.

Confidence

Moderate

Avalanche Summary

On Monday, a 2.5 persistent slab avalanche was observed at Hudson Bay Mountain on a northeast alpine slope, likely triggered by a cornice fall. Evidence of last week's avalanche cycle continues to be reported.

Higher north-facing slopes remain suspect for triggering persistent slabs, especially with heavy loads or in areas with variable snowpack depth. Where a thick, supportive surface crust is found, triggering avalanches on buried weak layers is unlikely.

Weather Summary

Tuesday Night

Partly cloudy. 15 to 30 km/h northwest ridgetop wind. Treeline temperature -6 °C. Freezing level at valley bottom.

Wednesday

Mix of sun and cloud. 20 to 40 km/h northwest ridgetop wind. Treeline temperature -2°C. Freezing level 1500 m.

Thursday

Mix of sun and cloud. 10 to 25 km/h west ridgetop wind. Treeline temperature -1 °C. Freezing level 1500 m.

Friday

Mix of sun and cloud. 20 to 40 km/h southwest ridgetop wind. Treeline temperature +2 °C. Freezing level 2000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.
  • Seek out sheltered terrain where new snow hasn't been affected by wind.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.
  • Avoid sun-exposed slopes, especially if the snow surface is moist or wet.

Problems

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.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.