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Avalanche Forecast

Archived

Nov 27th, 2024–Nov 28th, 2024

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

Regions

Northwest Coastal, Boundary, Kitimat, Nass, Rupert, Seven Sisters, Shames, Stewart, Howson, Microwave-Sinclair.

Avoid avalanche terrain.

Storm slab size and sensitivity to triggering will increase throughout the day.

Confidence

Moderate

Avalanche Summary

Only sluffing in steep terrain has been reported in the past couple days.

No other new avalanches have been reported since the weekend, but reports have been limited, especially in areas near Terrace. Please consider submitting your observations to the Mountain Information Network.

Snowpack Summary

By the morning of November 28th up to 50 cm could overlie variable snow surfaces, including small facets and/or surface hoar in sheltered areas and heavily wind-affected snow in exposed terrain.

In sheltered terrain in the northern part of the forecast region, a surface hoar layer may be found down around 80 cm.

A crust from early November can be found down 80 to 120 cm. Below this prominent crust are several other crust layers from October.

Snow depths vary across the region, but generally range from 100 to 230 cm in the alpine and about 50 to 100 cm at 1000 m.

Weather Summary

Wednesday Night

Cloudy with up to 20 cm of snow expected. 25 to 50 km/h southwest ridgetop wind. Treeline temperature -4°C.

Thursday

Cloudy with 15 to 30 cm of snow expected. 25 to 50 km/h southwest ridgetop wind. Treeline temperature -4 °C.

Friday

Cloudy  with up to 40 cm of snow expected by early morning. 40 to 60 km/h southwest ridgetop wind. Treeline temperature -5°C.

Saturday

Cloudy with up to 80 cm of snow possible. 30 to 60 km/h southwest ridgetop wind. Treeline temperature -1°C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid avalanche terrain during periods of heavy snowfall.
  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • As the storm slab problem worsens, the easy solution is to choose more conservative 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.