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Avalanche Forecast

Archived

Dec 20th, 2025–Dec 21st, 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 unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Glacier.

Strong winds and steady amounts of new snow are refreshing the storm slab problem.

Approach lee and cross-loaded slopes with caution and stick to sheltered spots to find the best snow!

Confidence

Moderate

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

Avalanche Summary

It was been another active week of natural and artillery controlled avalanches.

Skiers in the Asulkan drainage had a close call while travelling on ridgeline and triggered a size 2 avalanche.

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

Snowpack Summary

This week's 60-90 cm of settling storm snow has been redistributed by strong to extreme southerly winds. Beneath this recent storm snow a thin crust exists up to 2300m. This crust is a solid bed surface for avalanches to run on.

This December alone, 355 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, 8cm. Low -10°C. Winds SW 30-60km/hr. FZL (freezing level) at valley bottom

Sun Flurries, 11cm. High -7°C. Wind South 30-50km/hr. FZL 1100m

Mon Flurries, 8cm. High -8°C. Wind SW 30-45km/hr. FZL 900m

Tues Flurries, 4cm. High -9°C. Wind SW 30-60km/h. FZL 800m

Terrain and Travel Advice

  • 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.
  • Approach lee and cross-loaded slopes with caution.

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.