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Avalanche Forecast

Archived

Dec 11th, 2025–Dec 12th, 2025

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

Regions

Glacier.

Over 70 cm of snow has fallen in the past 72 hours, accompanied by strong southwest winds. Human-triggered avalanches remain a concern as the storm snow continues to settle.

Use caution near ridgetop, on leeward slopes and on cross-loaded features.

Confidence

Moderate

Avalanche Summary

A natural sz 3 avalanche from Mt. Tupper was observed in motion as the sun poked out Thursday. This large avalanche ran right to valley bottom and the powder cloud crossed the valley.

On Wednesday evening a widespread natural avalanche cycle occurred with size 2-3 avalanches running to valley bottom.

Avalanche control using explosives in the highway corridor produced numerous size 2-3.5 avalanches. These avalanches were running fast and travelled further then expected

Snowpack Summary

Up to 135cm 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

An increase in wind and temps as the next wave of snow arrives this weekend.

Tonight Trace precip. Low -8°C. West winds 15-35km/hr. FZL (freezing level) 1200m.

Fri 10cm. High -6°C. West winds 15-45km/hr. FZL (freezing level) 1300m.

Sat 6cm. High 0°C. SW winds 25-55km/hr. FZL (freezing level) 1700m.

Sun 18cm. High -1°C. SW winds 30-60km/hr. FZL (freezing level) 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.