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Avalanche Forecast

Archived

Dec 8th, 2024–Dec 9th, 2024

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 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, Manning, Skagit.

Ease into terrain on Monday. Verify conditions as you travel and tune into any signs of instability.

Confidence

Low

Avalanche Summary

There have been no recent reports in the region. We suspect the likelihood of avalanches has decreased substantially since the storm on the weekend, but rider-triggered storm slabs may still be possible at upper elevations on Monday.

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

Snowpack Summary

At upper elevations, 20 to 40 cm of snow from the weekend is expected to bond well. At lower elevations, a crust develops over a rain-soaked snowpack.

Snow depths at treeline vary across the region. Around 90 cm is reported in the Coquihalla and 60 cm near Manning Park.

Weather Summary

Sunday Night

Cloudy. 10 to 20 km/h northwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1000 m.

Monday

Mostly sunny. <10 km/h northwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1000 m.

Tuesday

A mix of sun and cloud. <10 km/h northwest ridgetop wind switching southwest increasing to 30 km/h. Treeline temperature 0 °C. Freezing level rising to 2700 m.

Wednesday

Mostly cloudy. 30 to 50 km/h northwest ridgetop wind. Treeline temperature 0 °C. Freezing level 2300 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • If you are increasing your exposure to avalanche terrain, do it gradually as you gather information.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks, or recent avalanches.
  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.
  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.

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.