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Avalanche Forecast

Archived

Apr 10th, 2019–Apr 11th, 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.

As soon as the sun comes out the surface snow will quickly become moist and increase the likelihood of loose wet avalanches.

Confidence

High -

Weather Forecast

WEDNESDAY NIGHT: Cloudy with clear periods / up to 10 cm snow accumulation / moderate northwest wind / freezing level 1100 mTHURSDAY: Mix of sun and cloud / light northwest wind / alpine high temperature -5 C / freezing level 1800 mFRIDAY: Mix of sun and cloud / light north wind / alpine high temperature -4 C / freezing level 1900 mSATURDAY: Cloudy / up to 10 cm snow accumulation / moderate southwest wind / alpine high temperature -4 C / freezing level 1700 m

Avalanche Summary

On Tuesday, a few human triggered wind/storm slabs up to size 1 were observed on sun affected slopes in the alpine. On Monday, only a few human triggered loose wet avalanches to size 1 were reported.On Sunday, there were reports of numerous natural, human and explosive triggered storm slab avalanches up to size 2.5 at treeline and in the alpine on all aspects (see this MIN report).

Snowpack Summary

10-35 cm of recent storm snow that fell over the weekend sits on a melt-freeze crust on all aspects, but on north facing slopes above 2000 m, where the recent new snow sits on dry snow and surface hoar (feathery crystals). The recent snow is bonding well with the underlying layers. Wind slabs can still be found in immediate lee features along ridge crests. Recent snowfall amounts taper quickly below treeline.

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

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.