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Avalanche Forecast

Archived

Dec 10th, 2022–Dec 11th, 2022

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.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Coquihalla, Manning, Skagit.

For the best riding seek out sheltered slopes with the deepest snowpack that hasn't been wind-affected. Watch for sudden changes to the upper snowpack if the sun comes out!

Confidence

High

Avalanche Summary

No new reports since the weekend. Keep sharing your observations via the MIN; it helps strengthen our information gathering.

Snowpack Summary

In deeper zones near ridges the snowpack is around 120 to 170 cm, which is low for early December. Alpine terrain in windy areas is scoured and bare.

Surface: Boot top powder in deep areas. Same old crusts, facets, and rocks on wind scoured slopes.Upper-pack: In sheltered areas below the fresh snow is well developed surface hoar. Generally there's 40 to 70 cm of low density and faceting (aka weak) snow in the upper pack.Mid-pack: November crust, with a layer of soft facets above. This is the primary weak layer, found pretty much halfway down.Lower-pack: a mixture of old crusts and facets but some suggestions that these layers are a bit harder or stronger than what's found in other regions (e.g. Duffy or Hurley).

Weather Summary

Saturday NightCooling temperatures with freezing level falling from more than 1000m to around 500m. Dry. South or SW wind moderate but diminishing.

SundayDry. Temps between -5 and 0 C. Freezing level rising to around 1000m. Light wind. Mostly cloudy.

Monday

Dry. Cooler with temps between -5 to -10 C and freezing level to valley bottom. Northerly light wind with outflow from the interior through the passes and in the major valleys. Mix of sun and cloud.

Tuesday

Similar to Monday but more sun and less cloud.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Seek out sheltered terrain where new snow hasn't been wind-affected.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.
  • The best and safest riding will be on slopes that have soft snow without any slab properties.

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.