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Avalanche Forecast

Archived

Dec 22nd, 2023–Dec 23rd, 2023

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
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, Harrison-Fraser, Manning, Skagit.

Avalanches are possible in wind loaded terrain.

Anticipate variable snow conditions and travel carefully due to early season hazards.

Confidence

Moderate

Avalanche Summary

Small, naturally triggered wet loose avalanches were observed in steep, rocky terrain on Wednesday.

If you do head into the backcountry please consider submitting observations and/or photos on the Mountain Information Network.

Snowpack Summary

Following the warm storm, a shift to colder conditions occurred upon its departure. The expected new snow is likely to adhere well to the cold warm surface. Avalanches are anticipated primarily in upper treeline locations where strong southwest winds have built up deeper layers of snow over existing, smooth, and firm surfaces. Below the treeline, expect to encounter dirt or shallow, dense, moist, or wet snow.

The mid and lower snowpack is made up of a series of crusts and rounded grains. The snowpack is generally well consolidated.

Overall, the snow depth remains shallow, especially on south facing slopes. Early season hazards are just below the surface.

Weather Summary

Friday Night

Mostly cloudy. 5cm of new snow expected above 500 m. Treeline low around -5°C. Freezing level 500 m. Moderate west ridgetop wind.

Saturday

Partly cloudy. A trace of snow expected. . Treeline temperature around -5 °C. Freezing level 500 m. Light southwest ridgetop wind

Sunday

Mostly clear. No new snow expected. Treeline temperature around -1 °C. Freezing level rising to 1200 m, possible temperature inversion. Strong south ridgetop wind.

Monday

Partly cloudy. No new snow expected. Treeline temperature around 0 °C. Freezing level around 1500 m. Strong south ridgetop wind.

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.
  • Even a small avalanche can be harmful if it pushes you into an obstacle or a terrain trap.
  • Travelling on skis is hazardous due to a very shallow mountain snowpack.

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.