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Avalanche Forecast

Archived

Jan 29th, 2016–Jan 30th, 2016

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

Regions

Jasper.

Highway 93 will be closed due to avalanche control from Sunwapta Warden Station to Saskatchewan Crossing. Expected time to open 4pm Saturday with moderate confidence. Check Alberta 511 for details.

Weather Forecast

Temperatures moderating around -10 for Saturday with only small inputs of new snow over the day. Increasing light to moderate winds through the day.

Snowpack Summary

Up to 30 cm in south, less in the north fell on Thursday with moderate SW winds building touchy storm slab on lee slopes at tree line and above. Moderate rain below tree line along with above freezing temperatures have created a moist snowpack made up of the large facet crystals.

Avalanche Summary

Skier accidental occurred at 1230 at Parkers Ridge. Size 3, 1 involvement, partially buried, no injuries, some loss of equipment. Depth 10-240cm x 400m x 400m. Road buried south of Parkers summer trail (100ms with average depth on road 1.5ms). Significant cycle on all aspects, most initiating from the alpine and tree line elevations. 

Confidence

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.

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.