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Avalanche Forecast

Archived

Apr 6th, 2019–Apr 7th, 2019

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.

Sunday is forecast to be windy with a bit more snow. Watch out for freshly formed wind slabs at higher elevations.

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

SATURDAY NIGHT: Mostly cloudy with isolated snowfall, accumulation 2 to 5 cm, moderate to strong southwest wind, alpine temperature -4 C, freezing level 1500 m.SUNDAY: Cloudy with snowfall, accumulation 5 to 10 cm, strong to extreme southwest wind, alpine temperature -2 C, freezing level 1700 m.MONDAY: Cloudy with snowfall, accumulation 5 cm, light southwest wind, alpine temperature -1 C, freezing level 1800 m.TUESDAY: Cloudy with snowfall, accumulation 10 cm, light west wind, alpine temperature -2 C, freezing level 1700 m.

Avalanche Summary

Numerous small loose wet avalanches were observed on Friday during daytime warming. They released within the recent storm snow.

Snowpack Summary

Around 20 cm of recent snow fell above 1500 m. Another 10 cm of snow is expected on Sunday above 1700 m, with associated strong to extreme southwest wind. This will likely form new wind slabs. All this recent snow overlies a melt-freeze crust or wet snow. Below 1500 m, the snowpack is wet and rapidly melting.

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.