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Avalanche Forecast

Archived

Feb 28th, 2024–Feb 29th, 2024

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 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, Boundary, Kispiox, Microwave-Sinclair, Ningunsaw, Ningunsaw, Ningunsaw, North Bulkley, South Bulkley, South Bulkley, South Bulkley, Telkwa.

Reactive wind slabs can be found on all aspects

Small avalanches may step down to weak layers, producing larger avalanches than you may expect.

Confidence

Moderate

Avalanche Summary

Natural wind slab activity continues to be reported, along with natural persistent slabs to size 1.5 in below treeline areas near Ningunsaw.

We expect natural activity to taper off, but human triggering still remains possible.

Snowpack Summary

20-50 cm of recent, wind-affected snow sits over a variety of weak surfaces including facets, or surface hoar over a crust in sheltered areas - all of which will be slow to bond.

Another layer of weak, faceted crystals and a crust are buried 40-70 cm deep. Check out this MIN for a great snowpack summary from Hankin on Tuesday.

The lower snowpack is generally well-bonded and strong.

Weather Summary

Wednesday Night

Partly cloudy. 20-30 km/h southwest ridgetop wind. Treeline temperature -18 °C. Isolated flurries possible.

Thursday

Partly cloudy with possible flurries. 30-40 km/h southeast ridgetop wind. Treeline temperatures vary from -8 °C in the south, to -12 °C in the north.

Friday

Partly cloudy with possible flurries. 30-50 km/h southeast ridgetop wind. Treeline temperatures around -10 °C.

Saturday

Partly cloudy with possible flurries. 30 km/h southeast ridgetop wind. Treeline temperatures around -15 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Keep in mind that human triggering potential persists as natural avalanching tapers off.
  • Potential for wide propagation exists, fresh slabs may rest on surface hoar, facets and/or crust.

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.