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Avalanche Forecast

Archived

Feb 24th, 2014–Feb 25th, 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

Glacier.

http://www.pc.gc.ca/apps/links/goto_e.asp?destination=http://bit.ly/1fj0THPWe are still at a heightened hazard rating due to buried crusts and surface hoar reactive to a humans weight as well as strong solar radiation today.  Be diligent i you terrain selection until this layer has had a chance to heal.

Weather Forecast

An upper ridge of high pressure over the area will keep conditions clear and cold for the next few days

Snowpack Summary

1-1.5m of storm snow is settling into a cohesive slab over the Jan 28/22 facet/surface hoar/crust interface. Snowpack tests suggests this weak layer is difficult to trigger, but if failed has high propagation propensity. In addition, layers in the top 60cm of the storm slab are reactive and if triggered will likely step down to the Jan 28/22.

Avalanche Summary

One size 2.0 natural slab avalanche in the highway corridor east of the Rogers Pass summit yesterday . From Saturday a size 2.5 slab avalanche was observed around noon behind the Asulkan Hut.

Confidence

Problems

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.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.