Avalanche Forecast

Issued: Apr 15th, 2018 3:23PM

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

Avalanche Canada mconlan, Avalanche Canada

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South Coast.

Forecasted snow Sunday night into Monday will build new storm slabs at all elevation bands. Treat the hazard as High if you find more than 30 cm of snow accumulation.

Summary

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

MONDAY: Cloudy with snowfall, accumulation 20 to 30 cm, light to moderate southeast winds, treeline temperature -2 C, freezing level 1000 m.TUESDAY: Mostly cloudy with light snowfall, accumulation 2 to 5 cm, light west winds, treeline temperature -2 C, freezing level 1100 m.WEDNESDAY: Mostly cloudy, light southwest winds, treeline temperature -2 C, freezing level 1100 m.

Avalanche Summary

We have received very little information on avalanche activity for this region.  From the little we have heard, skiers could easily trigger small loose wet avalanches on Saturday.  Forecasted snow should mean that the likelihood of triggering avalanches is on the rise.We would very much appreciate it if you spend a moment to submit any observations you have to the Mountain Information Network here, even if it is just a photo. Thanks!

Snowpack Summary

Snowfall forecasted Sunday night into Monday will form new storm slabs.  The new snow will fall on a sun crust on southerly aspects formed by Sunday’s sunshine.   Elsewhere, the snow will overlie storm slabs formed on Friday or wind slabs formed from strong south winds.  A thick melt-freeze crust exists below this, and is about 40 to 60 cm deep.Below about 1000 m, a spring snowpack exists.

Problems

Storm Slabs

An icon showing Storm Slabs
20 to 30 cm of snow is forecasted. This will form new slabs that may not bond well to varying underlying surfaces. Be cautious entering into immediate lee terrain features, as the snow will likely fall with southeast winds.
Pay attention to overhead hazards like cornices, which could trigger slabs on slopes below.Observe for the bond of new snow with the old surface before committing into avalanche terrain.Be cautious as you transition into wind-affected terrain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible - Likely

Expected Size

1 - 2.5

Valid until: Apr 16th, 2018 2:00PM

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