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Avalanche Forecast

Archived

Nov 24th, 2019–Nov 25th, 2019

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

Regions

Kootenay Boundary.

Little change expected over the week as cold air pushes through BC. The most likely spots for avalanches is wind affected terrain near ridges.

Confidence

Moderate - Uncertainty is due to the limited number of field observations.

Weather Forecast

SUNDAY NIGHT: Partly cloudy with some isolated flurries, 30 km/h wind from the northwest, alpine temperatures drop to -10 C.

MONDAY: Partly cloudy, 20-30 km/h wind from the northwest, alpine temperatures around -10 C.

TUESDAY: Mostly sunny, light wind, alpine temperatures around -12 C.

WEDNESDAY: Mix of sun and cloud, 40-60 km/h wind from the northeast, alpine temperatures around -12 C.

Avalanche Summary

No recent avalanche activity has been reported.

Snowpack Summary

Winter weather has arrived, but the snowpack is still shallow with lots or rocks and logs poking out (see these recent MIN reports here and here for some pictures). Total snowpack depth ranges from 80 to 100 cm on north-facing alpine terrain, while south-facing terrain only has 30 to 80 cm. There is 5-20 cm of low density snow on the surface sitting above widespread crusts. The most likely place for avalanches right now is on slopes where the wind has blown the recent snow into wind slabs.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.