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Avalanche Forecast

Archived

Dec 13th, 2015–Dec 14th, 2015

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

Regions

Glacier.

Given the right terrain feature the Dec 2 surface hoar layer may still be reactive to skier triggering below treeline.

Weather Forecast

The forecast is calling for light winds shifting from SW to NW and continued light precipitation with 5-10cm possible by Monday morning.

Snowpack Summary

The last storm dumped 100cm of snow which is now settling into a slab. The Dec 2nd persistent weak layer resides under the slab and consists of a surface hoar layer at and below TL and suncrust on alpine solar aspects. The weak layer remains reactive to stability tests in the hard range. 15cm recent snow now covers a supportive crust below 1700m.

Avalanche Summary

No new observations in the last 24 hours.

Confidence

Forecast snowfall amounts are uncertain

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.