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Avalanche Forecast

Archived

Dec 16th, 2025–Dec 17th, 2025

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

Regions

Glacier.

Continued snowfall and strong winds will continue to build reactive storm slabs.

Use caution as you approach wind affected areas and limit overhead exposure during times of rapid loading

Confidence

Low

Avalanche Summary

Wow, what an avalanche cycle! Heavy rainfall and warm temps triggered a widespread natural avalanche cycle up to size 3.5 in the highway corridor. Artillery avalanche control was very effective, with some avalanches showing wide propagation and running to the bottom of runouts.

Snowpack Summary

Warm temps and rain have significantly changed the snowpack at treeline & below.

New snow should bury a thin crust up to approximately 2300m, at lower elevations this crust is thicker (~3 cms) and has moist snow below

Approximately 150cms (or more!) of settled storm snow has fallen in the last couple of weeks. This sits on the on top of 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

The storms keep rolling in. Expect strong winds and continued snowfall.

Tonight Snow 25cm. Low -5°C. Winds SW 25km/hr-gusting 50. FZL (freezing level) 1300m.

Wed Flurries, 6cm. High -4°C. Wind SW 45km/hr gusting to 110km/hr. FZL 1300m.

Thurs Periods of snow, 14cm. Alp High -8°C. Wind SW 35-45. FZL 900m.

Fri Flurries, 6cm. SW winds 20km/hr gusting to 60 km/hr. FZL 900m.

Terrain and Travel Advice

  • Be alert to conditions that change with elevation, aspect, and exposure to wind.
  • 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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.