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Avalanche Forecast

Archived

Dec 7th, 2024–Dec 8th, 2024

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

Regions

Coquihalla, Manning, Skagit.

Stick to conservative terrain on Sunday. New snow is building fresh storm slabs which may be triggered by riders.

Confidence

Low

Avalanche Summary

We are still awaiting reports from the storm. We suspect the likelihood of natural and human triggered storm slab avalanches to continue into Sunday.

If you are going out in the backcountry, please consider sharing your observations on the Mountain Information Network (MIN).

Snowpack Summary

Storm totals of 20 to 50 cm are expected by the end of the day Sunday. The new snow is expected to bond well.

The mid and lower snowpack is generally well-settled and bonded.

Snow depths at treeline vary across the region. Around 90 cm is reported in the Coquihalla and 50 cm near Manning Park.

Weather Summary

Saturday Night

10 to 20 cm of snow. 40 to 60 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1000 m.

Sunday

5 to 15 cm of snow. 20 to 40 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1000 m.

Monday

Mostly sunny. <10 km/h northwest ridgetop wind. Treeline temperature -1 °C. Freezing level 1000 m.

Tuesday

Mostly sunny. <10 km/h northwest ridgetop wind. Treeline temperature 0 °C. Freezing level 3000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for fresh storm slabs building throughout the day.
  • Don't let storm day fever lure you into consequential terrain.
  • Stick to simple terrain features and be certain your location isn't threatened by overhead hazard.
  • Avoid freshly wind-loaded terrain features.

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.