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Avalanche Forecast

Archived

Dec 7th, 2024–Dec 8th, 2024

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

Regions

Sea To Sky, South Coast Inland, Brandywine, Garibaldi, Homathko, Spearhead, Birkenhead, Duffey, Harrison-Fraser, South Chilcotin, Stein, Taseko.

Ease into terrain cautiously and tune into any signs of instability. Fresh storm slabs may be triggerable by riders.

Confidence

Moderate

Avalanche Summary

We are still awaiting reports from the storm. We suspect a natural storm slab avalanche cycle to have run during the storm. On Sunday, we can expect storm slabs to remain triggerable by riders.

If you are going out in the backcountry, please consider sharing your observations on the Mountain Information Network (MIN).

Snowpack Summary

Storm totals of 30 to 70 cm are expected by Sunday morning. Any old surface layers such as facets, surface hoar or thin crusts have likely been neutralized by the rainy start to the storm. The cooling trend through the storm is also favorable for bonding.

The mid and lower snowpack is generally well settled and bonded.

Snow depths at treeline are around 100 cm near Whistler, and 70 cm in the Duffy.

Weather Summary

Saturday Night

5 to 15 cm of snow. 20 to 40 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1000 m.

Sunday

Snowfall ending, clearing to a mix of sun and cloud. 10 to 20 km/h northwest ridgetop wind. Treeline temperature -2°C. Freezing level 1200 m.

Monday

Sunny. 10 to 20 km/h northwest ridgetop wind. Treeline temperature -2°C. Freezing level 800 m.

Tuesday

A mix of sun and cloud. 10 to 20 km/h west ridgetop wind. Treeline temperature +2°C. Freezing level 3000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Start with conservative terrain and watch for signs of instability.
  • Keep your guard up as storm slabs may remain sensitive to human triggering.
  • Be especially cautious as you transition into wind-affected terrain.
  • Make observations and continually assess conditions as you travel.

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.