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Avalanche Forecast

Archived

Feb 24th, 2013–Feb 25th, 2013

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

Regions

South Coast.

Confidence

Fair - Due to variable weather conditions

Weather Forecast

Sunday night and Monday: In the south of the region -Heavy snowfall becoming moderate on Monday  In the north of the region - Moderate snowfall becoming light on Monday / Moderate to strong west winds becoming light northwesterly on Monday / Freezing level at 1000mTuesday: Light snowfall / Light to moderate south winds / Freezing level at 900mWednesday: Light snowfall (Moderate in the south) / Moderate southwest winds / Freezing level at 1000m

Avalanche Summary

Size 2.5 natural cornice falls triggered slabs on north and southeast alpine features in the Duffey area.  In the same part of the region a size 1 and a size 2 skier-triggered avalanche were reported having failed on the February 12th surface hoar. For more information, go to our Incident Report database.Avalanche activity is expected to ramp up again with weather forecast for Sunday night.

Snowpack Summary

Moderate snowfall in the north and locally heavy snowfall on the Coquihalla has been redistributed into wind slabs at treeline and above and may overlie weak surface hoar buried on February 20th. Where it exists, the surface hoar will likely prolong the reactivity of the recently developed storm slab.On shaded slopes up to 50cm of snow may overlie surface hoar which was buried on February 12th. Most reports of this layer are coming from the Duffey Lake area where observations include whumfing and easy, sudden planar test results. On solar aspects and at lower elevations recent accumulations overlie a melt freeze crust.The mid and lower snowpack pack layers are generally well settled.

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.