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Avalanche Forecast

Archived

Nov 27th, 2022–Nov 28th, 2022

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

Regions

South Coast Inland, Birkenhead, Coquihalla, Duffey, Harrison-Fraser, Manning, Skagit, South Chilcotin, Stein, Taseko.

Assess conditions as you travel - snow may hide reactive slabs or, more likely, early-season hazards.

Confidence

Low

Avalanche Summary

No new avalanches have been observed or reported in the region. Observations are limited at this time of year, if you head into the backcountry consider submitting a MIN report.

Snowpack Summary

Weekend snowfall accumulation ranged from 10-15 cm near the Duffy and upwards of 35 cm around the Coquihalla and south. While the snowfall totals vary around the region, southwest wind has impacted fresh snow equally. This snow mostly covered a crust at upper elevations and moist snow and dirt at treeline and below.

Where the snowpack is growing, a weak drought layer is down 20-50 cm. This layer consists of hard, wind-affected snow in the alpine, surface hoar or facetted snow in sheltered areas, and a crust on solar aspects and low elevations. Below this layer, several other facet-crust interfaces exist in the snowpack.

Terrain features poke through a building snowpack that ranges from 50-100 cm in the alpine and 40-60 cm at treeline. Most solar slopes and below treeline are below the threshold for avalanches.

Weather Summary

Sunday night

Cloudy with isolated flurries, trace accumulation and clearing overnight. Light to moderate north wind, treeline low temperatures -20 C, and freezing level valley bottom.

Monday

Sunny and cold with patchy clouds. Light north wind, treeline high temperatures -12 C.

Tuesday

Cold with a mix of sun and cloud and isolated flurries. Light northeast wind, treeline temperature -16 C.

Wednesday

Incoming precipitation and wind, 10-20 mm, strong southwest wind, treeline temperatures rising to -8 C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for areas of hard wind slab on alpine features.
  • Seek out sheltered terrain where new snow hasn't been wind-affected.
  • Approach lee and cross-loaded slopes with caution.

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.