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Avalanche Forecast

Archived

Dec 28th, 2024–Dec 29th, 2024

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

Regions

Coquihalla, Manning, Skagit.

Wind slabs will be reactive human triggers, especially at upper elevations.

Confidence

Moderate

Avalanche Summary

Friday, two large (size 2) natural glide slab avalanches were reported on rock slabs above the Coquihalla.

No other recent avalanches have been reported, although observations have been limited in this region. Please consider sharing your observations to the Mountain Information Network (MIN).

Snowpack Summary

Moderate south winds have redistributed 40 to 60 cm of recent snow. Rapid settlement has been observed at treeline and below. Expect to find deeper deposits on lee slopes, and windward slopes scoured.

This snow overlies a melt-freeze crust and a well-settled mid and lower snowpack to ground.

Snow height ranges from 100 to 150 cm at treeline in the Coquihalla, to 85 to 100 cm near Manning Park.

Check out this MIN for conditions.

Weather Summary

Saturday Night

Cloudy with up to 10 cm. 20 to 40 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1000 m.

Sunday

Partly cloudy. 10 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Monday

Cloudy with up to 10 cm. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -3 °C.

Tuesday

Partly cloudy. 10 to 20 km/h southwest ridgetop wind. Treeline temperature -4 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • 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.