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Avalanche Forecast

Archived

Jan 27th, 2025–Jan 28th, 2025

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

Regions

Northwest Coastal, Northwest Inland, Boundary, Stewart, Kispiox, Ningunsaw, Ningunsaw, Ningunsaw.

Deeply buried weak layers are slow to heal and require patience.

Choose low angle slopes free from overhead hazards.

Confidence

Moderate

Avalanche Summary

On Sunday, there were a few large to very large (size 2 to 3) persistent slab avalanches that failed during the warm weather on southeast and northeast aspects.

As well as numerous small wet loose avalanches from steep slopes facing the sun.

Snowpack Summary

20 to 40 cm of soft snow has been redistributed by southwest wind. Scouring exposed areas and loading lee features. In sheltered areas, this snow may sit on a layer of weak surface hoar crystals.

Around 100 to 200 cm deep are buried weak layers from December. Consisting of crusts, facets, and/or surface hoar. These layers continue to produce large avalanches.

The lower snowpack is strong, with no layers of concern.

Weather Summary

Monday Night

Cloudy. 30 to 50 km/h west ridgetop wind. Treeline temperature -6 °C.

Tuesday

Cloudy with 5 to 10 cm of snow. 10 to 20 km/h west ridgetop wind. Treeline temperature -6 °C.

Wednesday

Mostly cloudy with 20 to 30 cm of snow overnight and 10 cm during the day. 20 to 40 km/h west ridgetop wind. Treeline temperature -8 °C.

Thursday

Mostly cloudy with 5 cm of snow. 15 km/h south ridgetop wind. Treeline temperature -11 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid steep terrain that is rocky and thin.
  • Avoid areas where the snow feels stiff and/or slabby.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.

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.

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.