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Avalanche Forecast

Archived

Dec 5th, 2024–Dec 6th, 2024

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

Dangerous avalanche conditions persist as new snow and wind form fresh, reactive storm slabs.

Confidence

Moderate

Avalanche Summary

Our limited field data suggests a natural avalanche cycle occurred in the past few days as rain and warm temperatures infiltrated the region.

Please consider submitting your observations to the Mountain Information Network.

Snowpack Summary

New snow accumulates atop a moist upper snowpack from rain in the past few days. Strong winds will redistribute new snow and create heavily wind-affected surfaces.

The remainder of the snowpack is strong, with various hard layers and crusts.

Weather Summary

Thursday Night

Cloudy with 5 to 15 mm of precipitation. 40 to 60 km/h southwest ridge top wind. Freezing level drops to 1600 m. Treeline temperature 0 °C.

Friday

Cloudy with rain transitioning to snow, 10 to 30 cm of new snow. 40 to 60 km/h southwest ridgetop wind. Freezing level drops to 1000 m. Treeline temperature -1 °C.

Saturday

Cloudy with up to 10 cm of new snow. 20 to 40 km/h southwest ridge top wind. Treeline temperature -3 °C.

Sunday

A mix of sun and cloud with isolated flurries. 20 to 50 km/h northwest ridgetop wind. Treeline temperature -6 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Use conservative route selection. Choose simple, low angle terrain with no overhead hazard.
  • Be alert to conditions that change with elevation, aspect, and exposure to wind.
  • Avoid freshly wind-loaded features, especially near ridge crests, rollovers, and in steep terrain.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.