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Avalanche Forecast

Archived

Nov 23rd, 2012–Nov 24th, 2012

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

Regions

Glacier.

Weather Forecast

A pacific frontal system will move over the area today.  Cloudy moderate SW winds with moderate snow fall easing later today.  Unstable air in the wake of the front will result in snow showers with locally moderate winds this afternoon and overnight. 

Snowpack Summary

Now over 90mm of load on the Nov 6 crust, down 60-100cm.� Sudden planar and sudden collapse results have been reported above this layer recently. A cohesive storm slab has formed and is reactive where it overlies the Nov 16 sun crust.

Avalanche Summary

2 size 2 natural observed above the highway corridor yesterday one a result of a cornice fall in the alpine.  Loose point releases observed.  2 reports of skier accidental slab avalanches on steep wind loaded features in the alpine yesterday size 1.5

Confidence

Problems

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.

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.