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Avalanche Forecast

Archived

Nov 30th, 2022–Dec 1st, 2022

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

Northwest Coastal, Kitimat, Nass, Rupert, Seven Sisters, Shames, Stewart, Howson, Ningunsaw.

Continue to assess for wind slab as you move through terrain. Wind slabs could be found on all exposed terrain at treeline and above. As the cold temps settle in be sure to increase your margin for safety.

Confidence

Moderate

Avalanche Summary

Over the past couple days small wind slab avalanches have been reported in the region as a result of the strong outflow winds. These avalanches have been on exposed treeline and alpine slopes including cross loaded slopes.

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Snowpack and avalanche observation data are currently very limited in this region. If you head out in the backcountry, please consider posting your observations to the MIN. (Mountain Information Network)

Snowpack Summary

Over the past few days strong outflow winds have scoured easterly slopes and created wind slab on west and south slopes.

A layer buried in mid November can be found down around 70cm. This layer consists of a crust below ~1200m and a layer of surface hoar above this elevation.

The depth of the snowpack at treeline varies widely from 100-200 cm and tapers rapidly below treeline. Many early-season hazards such as rocks, stumps, and open creeks exist below treeline.

Weather Summary

Wednesday night

Moderate to strong outflow winds continue with temperatures at 1500m around -17. No new snow expected.

Thursday

Mostly cloudy with no new snow expected. Strong outflow winds in the morning and easing to light in the afternoon. Temperatures at 1500m around -14.

Friday

Strong outflow winds returning to the region mid day. Mostly sunny with temperatures at 1500m around -18.

Saturday

Mostly sunny with no new snow expected. Moderate northeast winds and the possibility of a temperature inversion.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Stay off recently wind loaded slopes until they have had a chance to stabilize.
  • Use ridges or ribs to avoid areas of wind loaded snow.

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.