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Avalanche Forecast

Archived

Feb 1st, 2025–Feb 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.
Below Treeline
Natural avalanches unlikely.

Regions

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

Recent snow will be reverse loaded.

Avoid areas where the wind is actively depositing snow.

Confidence

Moderate

Avalanche Summary

No avalanches have been reported since Tuesday.

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

Snowpack Summary

10 to 30 cm of new snow is now above previous highly variable surfaces. Strong winds from all directions continue forming pockets of wind slabs.

This snow has fallen on a crusts on south-facing slopes, and in places, surface hoar at lower elevations.

A weak layer of facets and crust from early December is buried approximately 50 to 100 cm deep. This layer likely contributed to avalanches last weekend but should be less reactive under current conditions, primarily posing a concern on steep rocky slopes.

Weather Summary

Saturday Night

Partly cloudy with flurries. 20 to 40 km/h east ridgetop wind. Treeline temperature -21 °C.

Sunday

Mostly sunny. 30 to 50 km/h northeast ridgetop wind. Treeline temperature -22 °C.

Monday

Sunny. 40 to 60 km/h northeast ridgetop wind. Treeline temperature -21 °C.

Tuesday

Sunny. 40 to 60 km/h east ridgetop wind. Treeline temperature -18 °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.