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Avalanche Forecast

Archived

Feb 3rd, 2025–Feb 4th, 2025

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

Regions

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

Seek areas where the wind is not actively depositing snow.

The best riding will be in zones protected from the wind with no overhead hazard.

Confidence

Moderate

Avalanche Summary

On Sunday, in the Hankin area, a natural wind slab avalanche was observed above the cabin. Review this MIN for further details.

During last weeks avalanche cycle, wind slabs were able to step down to weak layers from December.

Snowpack Summary

30 to 50 cm of storm snow from last week overlies a variety of surfaces. This snow has fallen on a crust on south-facing slopes, and in places protected from the wind surface hoar.

Wind slab exist on all aspects. Currently strong northly winds are forming pockets of wind slabs on south aspect terrain and past southerly winds developed wind slab on north aspect terrain.

A weak layer of facets and crust from early December is buried approximately 50 to 100 cm deep.

Weather Summary

Monday Night

Clear. 50 to 60 km/h east ridgetop wind. Treeline temperature -22 °C.

Tuesday

Sunny. 50 to 60 km/h east ridgetop wind. Treeline temperature -18 °C.

Wednesday

Sunny. 10 to 25 km/h east ridgetop wind. Treeline temperature -12 °C.

Thursday

Sunny. 10 to 15 km/h variable ridgetop wind. Treeline temperature -10 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.

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.