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Avalanche Forecast

Archived

Dec 8th, 2024–Dec 9th, 2024

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

Regions

Kootenay Boundary, Bonnington, Grohman, Kootenay Pass, Norns, Rossland, South Okanagan, Ymir, Shuswap, Crawford, Kokanee, North Okanagan, Valhalla.

Watch for signs of instability as you travel, storm snow may remain triggerable as it sits over a new rain crust.

Greatest reactivity is expected in wind affected terrain.

Confidence

Moderate

Avalanche Summary

Reports from Saturday indicated sluffing of the new snow on the rain crust. With further snowfall on Saturday night, we expect avalanche activity to have increased and slabs likely remain reactive to human triggers.

Snowpack Summary

Up to 20 cm of new snow has fallen in the last 2 days. This sits over a hard rain crust in most areas (see below). Surface hoar may remain below the storm snow in areas that did not receive much rain early in the storm.

Below the new storm snow, the snowpack is well-settled, dense, and generally strong. Treeline snow depths range from 100 to 150 cm.

Weather Summary

Sunday Night

Mostly clear skies. 20 to 40 km/h northwest ridgetop wind. Treeline temperatures drop to -8 °C.

Monday

Sunny. 20 to 40 km/h northwest ridgetop wind. Treeline temperatures around -4 °C.

Tuesday

Sunny with increasing afternoon cloud. 10 to 20 km/h northwest ridgetop wind. Treeline temperature -4 °C.

Wednesday

Partly cloudy. 30 to 40 km/h west ridgetop wind. Treeline temperature -4 °C.

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.
  • Use small, low consequence slopes to test the bond of the new snow.
  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.

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.