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Avalanche Forecast

Archived

Dec 9th, 2016–Dec 10th, 2016

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

Regions

Jasper.

Weather Forecast

Cold temps continuing but, the inversion is helping inspire you to get up high where it's more bearable (-15 to -20).

Snowpack Summary

Shallow snowpack areas facetting out to ground and losing cohesion quickly. The upper snowpack is a mixed bag of surface hoar, surface facetting, or layered rotting windslab above the Nov 12 crust (down 45-90cm). The crust is maintaining support for travel above 2100ms. Below 2100ms expect to be walking on the ground.

Avalanche Summary

Road patrols on the Maligne Road and Icefields Parkway observed 3 significant slab releases up to size 2. These were likely triggered from a combination of weak solar input, triggering a point release from the exposed rocks and hitting the shallow slope below. Several of these point releases in similar features noted on steep S aspects. 

Confidence

Problems

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.

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.