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Avalanche Forecast

Archived

Dec 19th, 2025–Dec 20th, 2025

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 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.

It has been very snowy and WINDY!

Extreme winds may have created reactive slabs further down in paths than you might expect.

Stick to sheltered terrain for the best riding quality and be diligent with your group management.

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 another active week of natural and artillery controlled avalanches.

A widespread cycle of natural avalanches occurred on Tuesday night into Wednesday. These avalanches were up to sz 3.0, initiating in the storm snow and running on a crust bed surface.

Avalanche activity continued Thursday and avalanche control Thursday evening produced avalanches up to size 3.0, running into below treeline elevations.

Snowpack Summary

This week's 60-80 cm of settling storm snow has been redistributed by strong to extreme 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.

This December alone, 345 cm of snow has fallen at treeline. This has settled to ~140cm 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

Arctic air pushing southward is interacting with the Pacific moisture stream. Expect snow and gusty winds over the next several days.

Tonight Flurries, 5cm. Low -13°C. Winds SW 30-55km/hr. FZL (freezing level) at valley bottom

Sat Flurries, 13cm. High -10°C. Wind SW 40-70km/hr. FZL 700m

Sun Snow 15cm. High -9°C. Wind SW 35-55km/hr. FZL 1000m

Mon Flurries, 8cm. High -9°C. Wind SW 35-50km/h

Terrain and Travel Advice

  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
  • Keep in mind a buried crust offers an excellent bed surface for avalanches.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.

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.