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Avalanche Forecast

Archived

Dec 18th, 2025–Dec 19th, 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 unlikely, human triggered possible.
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.

Human triggered avalanches are likely.

Storm slabs will be most reactive in exposed, wind effected terrain.

Confidence

Moderate

  • Uncertainty is due to the speed, direction, or duration of the wind and its effect on the snowpack.

Avalanche Summary

It has been an active week of natural and artillery controlled avalanches.

A large cycle of natural avalanches occurred on Tuesday night into Wednesday. These avalanches were up to sz 2.5, initiating in the storm snow and running on a crust bed surface.

Avalanche activity continued Thursday and avalanche control Thursday evening is anticipated to produce widespread results in the recent storm snow.

Snowpack Summary

40-60 cm of settling storm snow has been redistributed by strong southerly winds. Beneath this recent storm snow a thin crust in exists up to ~ 2300m. This crust is a solid bed surface for avalanches to run on.

~300 cm of snow has fallen at treeline in December. This has settled to ~120 cm of snow overlying the November rain crust. A spotty layer of surface hoar is just above the Nov Crust and exists at treeline in sheltered areas.

Weather Summary

A westerly flow brings continued snowfall Fri - Sun with cooler temperatures.

Tonight Flurries 10-15 cm. Low -11°C. Winds S 15 -gusts to 55km/hr. FZL (freezing level) 1100m.

Fri Snow, 2-4cm. High -11°C. Wind S 15km/hr gusting to 75km/hr. FZL valley bottom.

Sat Flurries, 15-20cm. High -10°C. Wind S 10km/hr gusting to 110km/hr. FZL 600m.

Sun Flurries, 5-10 cm. High -8°C. Wind S light gusting to 45km/hr. FZL 1000m.

Terrain and Travel Advice

  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
  • Be especially cautious as you transition into wind-affected 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.