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Avalanche Forecast

Archived

Apr 15th, 2018–Apr 16th, 2018

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

Regions

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.

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

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.