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Avalanche Forecast

Archived

Dec 29th, 2024–Dec 30th, 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.
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 may remain reactive human triggers

Approach ridgelines and convex rolls with caution.

Confidence

Moderate

Avalanche Summary

Last reported avalanche activity is limited to natural glide slab avalanches, that are typical of the steep, smooth rock slabs in the Coquihalla.

While nearly a week ago, on Wednesday an avalanche was triggered on a rocky north face slope (see photo below). Reactivity may continue in wind loaded ridgeline features like this.

Observations have been limited in this region. Please share any observations or photos to the Mountain Information Network (MIN).

Snowpack Summary

Up to 60 cm of wind affected snow sits above hard crust. The mid and lower snowpack are well consolidated with no deeper concerns.

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

Check out this MIN for recent conditions in Manning.

Weather Summary

Sunday Night

Cloudy with up to 10 cm of snow. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Monday

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

Tuesday

Mostly clear skies. 10 to 20 km/h southwest ridgetop wind. Treeline temperature -3 °C.

Wednesday

A mix of sun and cloud. 10 km/h southwest ridgetop wind. Treeline temperature -3 °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.