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Avalanche Forecast

Archived

Jan 16th, 2018–Jan 17th, 2018

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.

The persistent weak layers in the snowpack remain susceptible to human triggering.

Weather Forecast

Mainly cloudy with scattered flurries and around 4cm of snow today. A pending storm system will bring snowfall with upwards of 30cm expected by Friday afternoon. The avalanche danger will increase with this new snow load on the persistent weak layers.

Snowpack Summary

70cm of storm snow has settled into a slab over a series of persistent weak layers. The Jan 4th & Dec 15 surface hoar layers are down around 60cm and 90cm. The combination of load and a temperature inversion made these layers reactive over the last several days. These layers remain reactive with sudden planar results and potential for propagation.

Avalanche Summary

Seven new natural avalanches to size 2.5 recorded in the highway corridor yesterday off of steep south facing terrain. No new slides observed or recorded in the back country yesterday.

Confidence

Due to the number of field observations

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.