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Avalanche Forecast

Archived

Dec 9th, 2025–Dec 10th, 2025

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

Regions

Glacier.

An additional 30-40 cm of snow on Wednesday will revitalize the storm slab hazard.

Confidence

High

Avalanche Summary

Avalanche control using explosives in the highway corridor produced size 2-3 avalanches on Monday evening.

There was also evidence of a widespread natural avalanche cycle (also size 2-3 ) on all aspects in the Rogers Pass backcountry.

Snowpack Summary

Approximately 50-70 cm has fallen over the past week with periods of heavy loading and strong wind on Monday evening. An additional 30-40 cm is forecast for Wednesday. All this new snow needs time to settle.

Areas sheltered from the wind may have a layer of surface hoar buried around 80cm deep.

Weather Summary

Storming with heavy snowfall on Wed and gusty winds.

Tonight Snow, 16cm. Wind SW 40 km/h, FZL (freezing level) 900m..

Wed Heavy snow 36cm, Wind west 20 gusting to 60km/h, alpine high -2°C FZL 1700m.

Thurs Flurries, 9cm. Winds 20 gusting 60, FZL 1500m.

Fri Flurries, 7cm. Wind W 20 gusting 45. FZL 1000m.

Terrain and Travel Advice

  • Give the new snow several days to settle and stabilize before pushing into bigger 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.