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Avalanche Forecast

Archived

Dec 6th, 2024–Dec 7th, 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 possible, human triggered probable.
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 possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Dogtooth, West Purcell, Badshot-Battle, Central Selkirk, Goat, Retallack, Valhalla, Whatshan.

Choose small, low consequence slopes.

New storm and wind slabs will likely form throughout the day that will be reactive to rider traffic.

Confidence

Moderate

Avalanche Summary

A few wet loose avalanches up to size 2 have been reported throughout the region over the last 3 days, all on south-facing terrain. These likely occurred during periods of strong solar and/or above-freezing alpine temperatures.

Snowpack Summary

By the end of the day on December 7th up to 30 cm of new snow may have fallen. This new snow will overlie a variety of surfaces including a sun crust on steep south aspects to Surface hoar on northerly aspects.

The mid snowpack is generally well settled, with an early November crust buried 50 to 100 cm deep.

Snow depths at treeline are roughly 80 to 150 cm, and decreases rapidly at lower elevations.

Weather Summary

Friday Night

Cloudy with up to 10 cm of snow expected.  40 to 70 km/h southwest ridgetop wind. Treeline temperature -4°C.

Saturday

Cloudy with 10 to 20 cm of snow. 40 to 60 km/h south ridgetop wind. Treeline temperature -3 °C.

Sunday

Mostly cloudy with up to 10 cm of snow expected. 20 to 40 km/h west ridgetop wind. Treeline temperature -6 °C.

Monday

Mostly cloudy with trace amounts of snow possible. 15 to 30 km/h northwest ridgetop wind. Treeline temperature -8°C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Don't let storm day fever lure you into consequential terrain.
  • Be careful as you transition into wind-affected terrain.
  • Be aware of the potential for large avalanches due to buried surface hoar.

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.