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Avalanche Forecast

Archived

Jan 11th, 2024–Jan 12th, 2024

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.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Northwest Coastal, Boundary, Kitimat, Nass, Rupert, Seven Sisters, Shames, Stewart, Ningunsaw, Ningunsaw, Ningunsaw.

Seek out sheltered terrain where you can avoid wind slabs.

Cold and short days increase the consequences if caught in an avalanche; read this blog on managing cold weather.

Confidence

High

Avalanche Summary

Wind slabs that have formed due to north winds continue to be the main concern.

On Thursday skiers near Terrace triggered a wind slab avalanche up to 50 cm deep. Read the full report here.

On Wednesday several size 1 and 2 wind slab avalanches were reported throughout the region. They occurred on south- and east-facing slopes in the alpine.

On Tuesday a size 2 windslab avalanche was reported on a steep, southeast-facing, alpine feature in the Shames backcountry.

Snowpack Summary

Northerly winds are redistributing 20 to 50 cm of soft snow into wind slabs in exposed areas. These winds are opposite to regular loading patterns, so you could expect to find wind slabs on slopes you wouldn't normally.

This overlies previous hard surfaces or a melt-freeze crust that extends up to 1800 m.

Near Stewart and Ningunsaw, a weak layer in the form of a crust may exist up to 100 cm deep, particularly in the alpine with areas of shallow snowpack.

The remainder of the snowpack is reportedly strong with various hard crusts.

Snow depths vary throughout the region, ranging from 150 to 300 cm at treeline and tapering rapidly below.

Weather Summary

Thursday Night

Mostly clear with no new snow, alpine winds northeast 50 to 60 km/h, treeline temperature -30 ºC.

Friday

Sunny with no new snow, northwest alpine winds 20 to 50 km/h, treeline temperature -25 ºC.

Saturday

Partly cloudy with trace new snow, north alpine winds 30 to 50 km/h, treeline temperature -25 ºC.

Saturday

Mostly sunny with no new snow, north alpine winds 30 to 50 km/h, treeline temperature -25 ºC.

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.
  • Wind slabs may be poorly bonded to the underlying crust.
  • Seek out sheltered terrain where new snow hasn't been wind-affected.

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.