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Avalanche Forecast

Archived

Nov 29th, 2022–Nov 30th, 2022

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
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, North Shore, Sasquatch, Sasquatch, Sky Pilot, Tetrahedron, Skagit.

Heavy snowfall is expected to bring with it increased avalanche activity.

Confidence

Moderate

Avalanche Summary

No new avalanches have been observed in our area. In the Whistler area, however, there was one skier accidental size 2 produced from triggering a wind slab. If you head into the backcountry consider submitting a MIN report.

Snowpack Summary

At around 1000 m our snowpack is sitting at 85 cm. Since Monday morning, there has been 5 cm of new snow. At the highest elevations, recent wind-affected snow covers a melt-freeze crust and moist upper snowpack.

Snow is beginning to cover the surface roughness. The snow-dirt line is found around 1000 m, and most solar slopes and below treeline are below the threshold for avalanches. This will begin to change with the incoming storm.

Weather Summary

Tuesday Night

Cloudy, 30 to 35 cm accumulation, winds south-southwest 25 km/h gusting to 50, temperatures -5 to -10 at 1500 m.

Wednesday

Cloudy with some sunny periods, 5 to 15 cm accumulation, winds southwest 20 km/h gusting to 50, temperatures around -7 C.

Thursday

Mostly sunny, trace accumulation, winds northwest 8 km/h, temperatures -5 C at 500 m.

Friday

Mix of sun and cloud, 0 to 5 cm accumulation, winds southeast 10 km/h, temperatures -7 C with freezing levels climbing to 400 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for fresh storm slabs building throughout the day.
  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • Dial back your terrain choices if you are seeing more than 30 cm of new snow.
  • Travel in alpine terrain is not recommended.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.