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Avalanche Forecast

Archived

Dec 14th, 2015–Dec 15th, 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.

Conditions are generally excellent right now! The one thing to watch out for is the buried Dec. 3rd surface hoar between 1500 and 1850m. This is a strange situation for most backcountry skiiers as the danger is highest below treeline.

Weather Forecast

We are under the influence of a ridge of high pressure for the next few days. Expect to see clearing skies through the week, minimal snow and light NW winds. Temperatures will remain cool in the -10 to -20 range. No inputs to significantly change the danger rating or ski conditions are expected.

Snowpack Summary

In sheltered terrain between 1500m and 1850m, a 40-50cm soft slab sits over the large December 3rd surface hoar. This layer continues to produce whumphs and easy shears where it is present. No other significant shears have been observed. In the high alpine isolated wind slabs may exist, but will settle out over the next few days.

Avalanche Summary

No new avalanches observed today in our forecast area.

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.