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Avalanche Forecast

Archived

Jan 27th, 2025–Jan 28th, 2025

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

Regions

Kitimat, Nass, Rupert, Seven Sisters, Shames, Howson.

Cooler temperatures are expected to lower the danger.

Watch for small wind slabs building with new snow and wind.

Confidence

Moderate

Avalanche Summary

On Sunday, numerous small wet loose avalanches occurred during warm temperatures and sunshine. A few of them triggered wind slabs.

Snowpack Summary

Large surface hoar crystals have been reported growing in sheltered spots at treeline and below. A surface crust is likely to form on solar slopes as the temperatures cool off.

15 to 30 cm of settling snow sits on either old wind-affected layers or possibly surface hoar in sheltered spots. In exposed areas, soft snow has been redistributed into wind slabs.

100 to 200 cm deep in the snowpack are layers of crust, facets, and possibly surface hoar that were buried in December.

The lower snowpack is generally well-settled and unconcerning.

Weather Summary

Monday Night

Cloudy. 20 to 40 km/h west ridgetop wind. Treeline temperature -4 °C.

Tuesday

Cloudy with 0 to 10 cm of snow. 20 to 40 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 700 m.

Wednesday

Cloudy with 10 to 20 cm of snow overnight and 5 to 10 cm during the day. 30 to 50 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Thursday

Mostly cloudy with 5 to 10 cm of snow. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -7 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
  • Be careful as you transition into wind-affected terrain.

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.