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Avalanche Forecast

Archived

Dec 7th, 2024–Dec 8th, 2024

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

Regions

South Coast, Powell River, Tantalus, North Shore, Sasquatch, Sasquatch, Sky Pilot, Tetrahedron.

Ease into terrain cautiously and tune into signs of instability.

Confidence

Moderate

Avalanche Summary

We are still awaiting reports from the storm. We suspect loose wet avalanches during the heavy rain on Saturday. On Sunday, rider-triggered storm slabs are possible.

If you are going out in the backcountry, please consider filling out a Mountain Information Network (MIN) report.

Snowpack Summary

Up to 30 cm of new snow sits over a rain-soaked snowpack.

Prior to Saturday's monsoon, a significant melt-freeze crust in the mid snowpack was reported as a failure plane in snowpack tests. This layer has likely run its course during the storm.

The remainder of the snowpack is generally well settled and bonded.

Snow depths at treeline vary across the region. Prior to the rain, 140 cm was reported at Knuckles, 95 cm on the North Shore and 175 cm near Sky Pilot.

Weather Summary

Saturday night

15 to 25 cm of snow. 40 to 60 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level between 1000 and 800 m.

Sunday

Snowfall ending in the morning, clearing to a mix of sun and cloud. 10 to 30 km/h northwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1000 m.

Monday

Mostly sunny. 10 to 20 km/h northwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1000 m.

Tuesday

A mix of sun and cloud. <10 km/h ridgetop wind. Treeline temperature +3 °C. Freezing level 3000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Keep your guard up as storm slabs may remain sensitive to human triggering.
  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks, or recent avalanches.

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.