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Avalanche Forecast

Archived

Dec 7th, 2012–Dec 8th, 2012

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

Little Yoho.

The recent storm snow has helped create very good conditions. Some hidden hazards remain. JBW

Weather Forecast

A short lived ridge on Saturday will be followed by a weak system Sunday. In the wake of Sunday's storm, the Arctic Front will descend southwards bringing colder temperatures

Snowpack Summary

Some wind slabs in open areas at and above treeline. Lower snowpack is well settled with some shears that are producing moderate resistant planar results. Major concerns are stubborn to touchy windslabs on north and east aspects with avalanche potential to size 2 and deep persistent slabs stubborn, isolated to size three failing on November crust.

Avalanche Summary

No new avalanches in the past 24 hrs. Storm related avalanches from the last week to size two in wind effected areas. Explosive control to size 3 stepping down to Nov. Crust.

Confidence

Wind speed and direction is uncertain on Sunday

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.

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.