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Avalanche Forecast

Archived

Dec 25th, 2025–Dec 26th, 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.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

Monitor storm snow depth and reactivity as you travel and plan to dial back terrain choices over the day. Sheltered terrain away from overhead hazards will offer the best, safest conditions.

Confidence

Moderate

  • Uncertainty is due to the limited number of field observations.
  • Forecast snowfall amounts are uncertain.

Avalanche Summary

No new avalanches were reported in the region on Wednesday.

On Tuesday, riders near Chilliwack triggered many size 1 storm slabs on all aspects and elevations. In the Coquihalla, four size 2 glide slabs were observed. Glide slabs may release without warning. Always avoid travelling near them.

Another round of moderate to heavy snowfall through Friday should maintain active avalanche conditions, although Allison Pass may get missed.

Snowpack Summary

25 - 30 cm of new snow should fall by end of day Friday, but only a trace is expected in Allison Pass.

This will add to about 120 cm of settling storm snow since December 16. Strong southerly winds over this period have left behind wind slabs of varying age and reactivity, and exposed rock or December crust in open terrain.

In more sheltered terrain, the December 16 crust with wet snow below it should be present a short distance above the ground and all the way to mountaintop. This tapers to storm snow on bare ground below about 1500 m.

Snow depths at the treeline range widely, from 100 - 300 cm, as a result of wind redistribution.

Weather Summary

Thursday Night
Cloudy with flurries bringing 5 to 10 cm of new snow. 40 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1200 m.

Friday
Cloudy with continuing flurries bringing 15 to 20 cm of new snow. 20 to 40 km/h southwest ridgetop wind, easing. Treeline temperature falling to -6 °C. Freezing level falling from 1200 m to valley bottom.

Saturday
Mainly sunny with 5 to 10 cm of new snow from overnight. 20 km/h northwest ridgetop wind. Treeline temperature -12 °C.

Sunday
A mix of sun and clouds. 30 km/h west ridgetop wind. Treeline temperature around -9 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Don't let storm day fever lure you into consequential terrain.
  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.

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.