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Avalanche Forecast

Archived

Jan 12th, 2024–Jan 13th, 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, 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

Kootenay Boundary, Bonnington, Grohman, Kootenay Pass, Norns, Rossland, South Okanagan, Ymir, Crawford, Moyie, St. Mary, Kokanee, Retallack, Valhalla.

New snow falling earlier in the week is being redistributed into lee terrain.

Extreme cold significantly increases the consequences of an incident in the backcountry.

Confidence

Moderate

Avalanche Summary

On Thursday there was a report of a remotely triggered (from a distance)size 1 persistent slab avalanche in the Rossland Range. On Wednesday in the Bonnington range there was a report of a naturally triggered size 3 avalanche on an east aspect in the alpine. This was suspected to have run on a layer of surface hoar buried in early January.

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

Snowpack Summary

In the past week, as much as 70 cm of snow has accumulated in some areas. This new snow has buried a variety of old surfaces, including surface hoar on sheltered, north-facing terrain and a sun crust on south-facing slopes.

The middle of the snowpack contains a series of old melt freeze-crusts.

A thick crust deep in the snowpack largely protects any weak layers further down in the snowpack from being triggered.

Weather Summary

Friday Night

Mostly clear, north alpine wind 10 to 30 km/h, treeline temperature -28 °C.

Saturday

Sunny with no precipitation, northwest alpine wind 15 to 30 km/h, treeline temperature -24 °C.

Sunday

Sunny with no precipitation, northwest alpine wind 20 to 40 km/h, treeline temperature -18 °C.

Monday

Sunny with no precipitation, northeast alpine wind 20 to 40 km/h, treeline temperature -16 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Give the new snow several days to settle and stabilize before pushing into bigger terrain.
  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
  • Recent wind has varied in direction so watch for wind slabs on all aspects.

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.