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Avalanche Forecast

Archived

Mar 6th, 2014–Mar 7th, 2014

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

Regions

Kootenay Boundary.

Confidence

Fair

Weather Forecast

Synopsis: A ridge of high pressure over the coast should mean drier conditions Friday before the next front system slides down the BC coast on Saturday extending into southeastern BC by late Sunday. Tonight and Friday: Isolated flurries or showers possible / Light W winds / Freezing levels 2000m Saturday:  Isolated flurries or showers possible / Moderate SW winds / Freezing levels 2000m Sunday: Wet snow or rain overnight / Moderate to strong SW winds / Freezing levels 2100m

Avalanche Summary

The storm slab remains reactive, producing natural, accidental and controlled avalanches up to size 2.5 on all aspects and at a variety of elevations. Avalanche activity was greatest in areas where the recent precipitation fell as rain.Avalanche activity on the mid pack's persistent weak layer has decreased recently which indicating that it is has become harder to trigger.  However, the few avalanches that have released on this layer have been large and destructive.  Some of these have been triggered remotely.

Snowpack Summary

Up to 55cm of new storm snow sits on top of a variety of old surfaces.  A layer of facets can be found on north aspects with a sun crust on many shout facing slopes.  In sheltered and shaded features the storm buried surface hoar. Warm temperatures are causing the new snow to settle into a widespread soft slab.  Sustained SW winds have have formed winds labs in lee features. Below 1800m rain may have saturated the upper snowpack.The midpack is broken by a widespread persistent weak layer buried mid February and now found down 90 to 120cm. The form of this week layer varies from surface hoar  to a sun crust and/or facets but it can be found at all elevations, on all  aspects and is still a concern.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.