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Avalanche Forecast

Archived

Dec 17th, 2025–Dec 18th, 2025

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

Regions

Glacier.

Natural avalanches are likely. Reactive storm slabs are present at all elevations.

Stick to simple terrain and limit your exposure to overhead hazard.

Confidence

Moderate

  • Forecast snowfall amounts are uncertain.

Avalanche Summary

Natural avalanche activity continued overnight and into the day on Wednesday. These avalanches were up to sz 2.5, initiating in the storm snow and running on a crust bed surface.

On Dec 15, 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

30-50 cm of low density storm snow buried a thin crust up to approximately 2300m, at lower elevations this crust is thicker (~3 cms) and has moist snow below. This crust is a solid bed surface for avalanches to run on.

The over 120 cm of storm snow in the past week is settling rapidly. 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

A westerly flow brings continued snowfall this week, with cooler temperatures.

Tonight Flurries 2-4 cm. Low -13°C. Winds SW 40km/hr. FZL (freezing level) 1600m.

Thurs Periods of snow, 15-20cm. Alp High -9°C. Wind SW 35-45. FZL 900m.

Fri Flurries, 5-10cm. Alp High -8°C. SW winds 30km/hr gusting to 70 km/hr. FZL 900m.

Sat Flurries, 5-10cm. High -10°C. Wind S 10km/hr gusting to 110km/hr. FZL valley bottom.

Terrain and Travel Advice

  • Use increased caution at all elevations. Storm snow is forming touchy slabs.
  • Keep in mind a buried crust offers an excellent bed surface for avalanches.
  • 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.