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Avalanche Forecast

Archived

Dec 18th, 2015–Dec 19th, 2015

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

Regions

Little Yoho.

People have started testing the waters in steeper terrain below treeline, but trust should come slowly as the Dec 3 layer is very prominent. Be curious about seeing if its there, and be conservative in your terrain choices. SH

Weather Forecast

Expect mainly cloudy conditions and a few cm every day through the forecast period . There will be light to moderate West winds and alpine temperatures in the -12 to -16C range for Saturday.

Snowpack Summary

In sheltered terrain between 1500m and 1850m, a 40-50cm soft slab sits over the large December 3rd surface hoar. No other significant layers have been observed. There is approximately 130-140cm at treeline.

Avalanche Summary

No new avalanches observed in past few days.

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.