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Avalanche Forecast

Archived

Feb 22nd, 2024–Feb 23rd, 2024

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

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

New snow and wind will create fresh slabs that likely sit atop various weak grains combined with crusts in the upper snowpack.

Confidence

Moderate

Avalanche Summary

A couple of skier-triggered size 1 and 1.5 slab avalanches have been reported this week in the Terrace area. These avalanches occurred on north-facing terrain at treeline and above, failing on a facet/crust combination down roughly 20 to 30 cm from the surface.

Snowpack Summary

Snowfall is burying predominantly faceted and wind-affected surfaces. New snow may have buried surface hoar in wind-sheltered terrain and a sun crust on south-facing slopes.

A couple of crusts exist in the upper snowpack that have proven to be problematic sliding surfaces over the last couple of weeks.

Below, the mid and lower snowpack is generally well-bonded and strong.

Weather Summary

Thursday Night

Cloudy with 5 to 15 cm of snow. 60 to 80 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Friday

Cloudy with 5 to 20 cm of snow. 60 to 80 km/h west ridgetop wind. Treeline temperature -7 °C.

Saturday

Cloudy with 5 to 10 cm of snow. 50 to 70 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Sunday

Cloudy with 0 to 10 cm of snow. 20 to 40 km/h northwest ridgetop wind. Treeline temperature -10 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Closely monitor how the new snow is bonding to the old surface.
  • Wind slabs are most reactive during their formation.
  • Fresh snow rests on a problematic persistent slab, don't let good riding lure you into complacency.

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.