Avalanche Canada dsaly, Avalanche Canada

Kootenay Boundary Avalanche Forecast

Apr 13th, 2019 3:39PM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Storm Slabs.

Snowfall Saturday accumulated at upper elevations. Use caution around ridge crests and lee terrain features, where deposits will be most reactive.

Summary

Confidence

Moderate -

Weather Forecast

SATURDAY NIGHT: Flurries continuing into the evening, up to 10 cm snow / west wind, 20-40 km/h / alpine low -6 C / freezing level 700 mSUNDAY: Mix of sun and cloud with flurries, trace to 5 cm accumulation / west wind, 20-40 km/h / alpine high -5 C / freezing level 1600 mMONDAY: Mix of sun and cloud and isolated flurries / southwest wind, 10-20 km/h / alpine high -2 C / freezing level 1600 mTUESDAY: Clear with cloudy periods / southwest wind, 10-25 km/h / alpine high +1 C / freezing level 2000 m

Avalanche Summary

On Wednesday, wind slabs in lee features were reactive to explosives.On Tuesday, wind and storm slabs up to size 1 were reactive to skier traffic on sun affected slopes in the alpine.

Snowpack Summary

Up to 15 cm new snow covers a melt-freeze crust on most aspects except for north facing slopes above 2000 m, where new snow overlies dry, settled snow. At these sheltered upper elevations, the recent 10-35 cm snow over the past week is bonding well to the underlying layers.Below treeline snow is disappearing rapidly.

Problems

Storm Slabs

An icon showing Storm Slabs

Likelihood

Likely - Possible

Expected Size

1 - 1.5
Around 15 cm fresh snow has accumulated at upper elevations. The new snow may hide older wind slabs and wind may build new ones through the day. Be cautious around ridge crests and in wind loaded terrain where deposits will be deepest.
Be careful with wind loaded pockets, especially near ridge crests and roll-overs.Be alert to conditions that change with elevation.

Aspects:

North, North East, East, South East, West, North West.

Elevations:

Alpine, Treeline.

Valid until: Apr 14th, 2019 2:00PM