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Avalanche Forecast

Archived

Jan 8th, 2013–Jan 9th, 2013

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

Regions

Glacier.

A lull between storms today but be cautious in your terrain selection as conditions have not improved given yesterdays new snow and last nights winds.

Weather Forecast

A weak ridge of high pressure will keep things mainly dry today until a frontal system arrives this evening bringing moderate amounts into Wednesday. Some clearing skies can be expected in the eastern regions before clouding over this afternoon.

Snowpack Summary

60 cm of storm snow overlies a variety of surfaces ranging from sun crust on south and west aspects to surface hoar on north and east. The surface hoar buried is largest between 1500-2000m. The mid-pack is well settled and the Nov 6 crust is down 150 to 180cm.

Avalanche Summary

Four avalanches to size 2.0, two size 2.5 and one size 3.0 were down in the highway corridor yesterday. All natural slab avalanches.

Confidence

Intensity of incoming weather systems is uncertain

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.

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.