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Avalanche Forecast

Archived

Jan 4th, 2025–Jan 5th, 2025

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

Regions

Sasquatch, Sasquatch, Coquihalla, Harrison-Fraser, Manning, Skagit.

Fresh wind slabs will likely be triggerable by riders on Sunday.

Confidence

Moderate

Avalanche Summary

A couple of MINs from the Coquihalla area on Friday reported blowing snow, shooting cracks and a small skier-triggered wind slab at wind exposed elevations.

If you go out in the mountains, please consider sharing any observations on the Mountain Information Network (MIN).

Snowpack Summary

New snow accumulates over soft, faceted and/or moderately wind affected snow. Good snow quality has been reported in wind-sheltered terrain.

A substantial crust up to 30 cm thick sits 50 to 100 cm deep, well-bonded to surrounding snow. The mid and lower snowpack is generally well consolidated, with several well-bonded crusts scattered throughout.

Treeline snow depths range from roughly 150 to 220 cm around the Coquihalla and 100 to 150 cm around Manning Park.

Weather Summary

Saturday night

Cloudy with 5 to 10 cm of snow. 20 to 40 km/h southwest ridgetop wind. Treeline temperature -4 °C.

Sunday

Cloudy with 5 to 10 cm of snow. Southwest wind easing 40 to 20 km/h. Treeline temperature -2 °C.

Monday

Sunny. 20 to 40 km/h northeast ridgetop wind. Treeline temperature -1 °C.

Tuesday

Sunny. Southwest ridgetop wind increasing 10 to 40 km/h. Treeline temperature 0 °C. Freezing level rising to 3000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Expect slab conditions to change drastically as you move into wind-exposed terrain.
  • Avoid freshly wind-loaded terrain features.
  • Seek out sheltered terrain where new snow hasn't been affected by wind.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.