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Avalanche Forecast

Archived

Dec 6th, 2014–Dec 7th, 2014

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.

Keep an eye on the temperatures and type of precipitation that falls today and manage the terrain you are on or exposed to accordingly. Above 0 temperatures and rain falling will deteriorate the integrity of the upper snowpack.

Weather Forecast

Pacific frontal system moves in over the interior today bringing light to moderate snow with milder temperatures. A band of warm air aloft moving across the interior has created a temperature inversion nearing 0 degrees at 2000m. There is the possibility of freezing rain today. Winds are forecast to be light to moderate from the SW.

Snowpack Summary

5-10cm of light snow has buried the latest surface hoar layer. On steep solar aspects this layer formed a sun crust. The Nov 21 and Nov 9 persistent weak layers are buried down ~100 and ~130cm and are less reactive. The failure character of these layers is still sudden planer in snowpack tests. Breakable crust below ~1600m.

Avalanche Summary

No new avalanches were observed yesterday.

Confidence

Intensity of incoming weather systems is 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.