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Avalanche Forecast

Archived

Mar 1st, 2024–Mar 2nd, 2024

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.
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.

Reactive wind slabs may exist on all aspects

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

Confidence

Moderate

Avalanche Summary

No new avalanches have been reported, but field observations have been very limited.On Tuesday a large (size 2) avalanche was reported at Hankin, full details in this MIN.

On Monday several large (size 2) naturally triggered avalanches were reported in the Babines in wind-affected terrain in the alpine.

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

Snowpack Summary

In alpine and open treeline areas, 15 to 30 cm of potentially wind-affected snow sits over a variety of surfaces including facets, surface hoar, old hard wind slabs, or a crust. The buried surface hoar is most likely to be found in sheltered areas at treeline and below.

Another layer of weak, faceted crystals and a crust may be found buried 30 to 60 cm deep.

The lower snowpack is generally well-bonded and strong.

Weather Summary

Friday Night

Cloudy, with 0 to 1 cm of snow. 30 to 40 km/h east ridgetop wind. Treeline temperature around -16 °C.

Saturday

Cloudy, with 0 to 1 cm of snow. 40 km/h southeast ridgetop wind. Treeline temperature around -18 °C.

Sunday

Mostly cloudy, no new snow. 30 km/h southeast ridgetop wind. Treeline temperature around -20 °C.

Monday

Mostly sunny, no new snow. 30 km/h southeast ridgetop wind. Treeline temperature around -12 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

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

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.