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Avalanche Forecast

Archived

Dec 21st, 2022–Dec 22nd, 2022

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

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

Assess for drifts and stiff wind slabs in exposed terrain. Cohesive slabs formed on the surface may take some time to bond to the underlying layers.

Check out the most recent Forecasters Blog, explaining how to manage extreme cold conditions.

Confidence

High

Avalanche Summary

No new avalanches have been reported in the past few days.

If you head out into the mountains, please share your photos or observations on the Mountain Information Network. Your information helps us understand local conditions!

Snowpack Summary

Roughly 50 cm of recent low-density snow continues to be redistributed by northerly winds at upper elevations.

The new snow is poorly bonded in areas to the underlying snowpack, which consists of a variety of firm, previously wind-affected surfaces and crusts. In sheltered terrain at lower elevations, the new snow sits on large surface hoar and a sun crust on solar aspects.

The lower snowpack is generally well settled and bonding well.

At treeline the snowpack depth is roughly 200 cm.

Weather Summary

Cold arctic air continues to blanket Southwest BC until Friday when a warm and wet storm begins to move inland.

Wednesday night

Clear. temperatures -20 to -30 C and light to moderate easterly winds in the alpine.

Thursday

Sunny with periods of cloud. No Precipitation. Temperatures -20 to -30 C and light to moderate easterly winds in the alpine.

Friday

Cloudy with snow, 10 to 20 cm. Temperatures of -5 to -15 C and moderate to strong southwest winds. Freezing levels rise to around 1000 m.

Saturday

Cloudy with a mix of snow and rain, roughly 20 cm. Temperatures around 0 C, strong winds in the alpine. Freezing levels rise to around 1600 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Wind slabs are most reactive during their formation.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Wind slabs may be poorly bonded to the underlying crust.

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.