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Avalanche Forecast

Archived

Mar 30th, 2018–Mar 31st, 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 possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Cariboos.

Human triggered avalanches are likely this weekend, especially on slopes getting hit by the sun.

Confidence

Moderate -

Weather Forecast

SATURDAY: Mostly sunny with light west wind, freezing level up to 700 m, and alpine high temperatures near -10 C.SUNDAY: Cloudy with light flurries (4-8 cm of snow), light wind, freezing level up to 800 m, and alpine high temperatures near -8 C.MONDAY: Mix of sun and cloud with light wind, freezing level up to 600 m, and alpine high temperatures near -10 C.

Avalanche Summary

Heavy snowfall resulted in a widespread natural avalanche cycle on Tuesday and Wednesday. Storm slabs in the size 2-3 range were reported on all aspects between 1700 and 2500 m. Southerly aspects were the most reactive with numerous large and very large (size 2.5-3.5) avalanches running on a recently buried sun crust. Avalanche activity continued following the storm, with a few size 2 natural storm slab avalanches reported on north and east aspects on Thursday. A cornice fall triggered a large slab avalanche with a 100 cm crown on a north aspect at 2600 m. A skier also remotely triggered a size 1 wind slab on a southeast aspect at 1900 m.While the natural cycle is tapering off, human triggered avalanches remain likely at treeline and above where the touchy late-March crust/surface hoar layer exists.

Snowpack Summary

Another 10-20 cm of snow on Friday brings the weekly total to 60-100 cm. Storm snow was accompanied with moderate to strong winds from the southwest.The storm snow sits on an interface buried in late-March that consist of crusts at low elevations and on south aspects, and surface hoar on shaded aspects at higher elevations.Persistent weak layers from early January and mid-December are still being reported by local operators, but are generally considered dormant.

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.