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Avalanche Forecast

Archived

Jan 23rd, 2017–Jan 24th, 2017

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

Regions

Glacier.

Weather Forecast

Today mainly cloudy, no precipitation, an alpine high of -8 deg, freezing level to 900m and light winds. No significant precipitation for the for seeable future. A High pressure is building which will block aleutian storm systems to the north coast.

Snowpack Summary

Storm snow is settling and bonding to the mid january interface. Previous cool night time temps have aided in extracting slab properties out of the new snow, leaving it right side up. Storm snow stability tests produced mod-hard results with resistant to broken characteristics. Dec 18th interface is buried 1m and unreactive to stability tests.

Avalanche Summary

5 new avalanches observed in the highway corridor to size 2.5 on solar aspects yesterday. No NEW avalanches reported from the back country. Large destructive avalanches ran full path last week in the Highway corridor up to size 3.5, and reports from the back country observed natural slab avalanches to size 2.5 during the storm.

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.