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Avalanche Forecast

Archived

Dec 8th, 2016–Dec 9th, 2016

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

Regions

Little Yoho.

Evaluate November Crust carefully prior to committing to bigger slopes.

Weather Forecast

The cold weather is expected to continue with a few flurries over the weekend.

Snowpack Summary

There is 30-70 cm of settled snow overtop of the November 12 crust. Stability tests on this crust are mixed, ranging from no results to easy results. Recent avalanche activity suggest this crust is more reactive in the Lake Louise area on southerly aspects at tree-line and above elevations. Small wind slabs only found in isolated areas in alpine.

Avalanche Summary

Of note is a skier triggered avalanche in the Lake Louise side-country on Tuesday. This was on a southerly aspect and ran on the November crust. A fresh size 2 avalanche was also noted running on top of the raincrust, on south facing terrain north of Observation Peak.

Confidence

Due to the number of field observations

Problems

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.