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Avalanche Forecast

Archived

Dec 10th, 2025–Dec 11th, 2025

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

Regions

Glacier.

Heavy snowfall with strong- extreme wind over the past week has created a 40-90cm thick storm slab.

Storm snow needs time to settle. Don't let the improving weather influence your decision making.

Human triggered avalanches remain likely especially near ridgetop in the alpine.

Confidence

Moderate

Avalanche Summary

Avalanche control using explosives in the highway corridor has produced size 2-3.5 avalanches. These observed avalanches are running fast and traveling father then expected.

Another widespread natural avalanche cycle is expected in the Rogers Pass backcountry on Wednesday evening.

Snowpack Summary

Up to 90cm of snow has fallen over the last week with periods of strong to extreme southwesterly wind. This has created a thick storm slab which will need time to settle.

Areas sheltered from the wind may have a layer of surface hoar buried around 100cm deep.

Weather Summary

Storm intensity tapering off towards the weekend.

Tonight Snow, 13cm. Wind W 40 km/h gusting 70, FZL (freezing level) 1200m.

Thurs Cloudy with Sunny periods. Trace snow. Winds W 25-45, FZL 1100m.

Fri Cloudy, scattered flurries. 5cm. Wind W 20-40 FZL 1000m.

Sat Isolated flurries. Trace precipitation. SW 35 gusting 65. FZL 1600m.

Terrain and Travel Advice

  • Give the new snow several days to settle and stabilize before pushing into bigger terrain.
  • Avoid freshly wind-loaded features, especially near ridge crests, rollovers, and in steep terrain.
  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.

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.

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.