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Avalanche Forecast

Archived

Jan 27th, 2013–Jan 28th, 2013

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

Regions

Glacier.

Weather Forecast

Light amounts of precipitation are forecast today as a northwest flow sets up. On Monday a low pressure system will bring light to moderate amounts into Tuesday.

Snowpack Summary

30cm of settling low density snow in the upper snowpack. Jan 23 layer is down 50 to 60cm over a well settled mid pack.  Below 1800m surface hoar is buried at the Jan 23 interface. The Nov 6 crust is down around 200cm.

Avalanche Summary

4 natural loose size 2.0 to 2.5 avalanches and 1 natural  slab size 2.5 avalanche were observed within the highway corridor.

Confidence

Intensity of incoming weather systems is uncertain on Monday

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.