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Avalanche Forecast

Archived

Nov 15th, 2015–Nov 16th, 2015

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

Regions

Little Yoho.

A natural cycle is tapering off as of Sunday. Remain vigilant on Monday as human triggering will remain likely on Monday. Ice Climbers: Be wary of steep gully features.

Weather Forecast

Another small storm will give the region about 20cm of snow on Tuesday. Likely, this will keep danger ratings elevated. Wednesday an arctic high pressure will start to develop bringing very cold temperatures to the region. We expect the cold temps to slow down any natural avalanche cycle that may develop as a result of Tuesday's storm.

Snowpack Summary

85cm of snow on the ground at tree line near Bow Summit today. 10-15cm of that fell overnight. The snowpack in this area lacks cohesion, and forecasters were routinely breaking through to the ground. Snowpack tests produced moderate results, the failure being right on the ground. Nov 5 and 11 layers found 15cm and 30cm from ground respectively.

Avalanche Summary

Observations near Bow Summit today indicate a widespread loose/dry avalanche cycle. They ran from steep gullies and poured out onto the fans below (up to size 2). Additionally two substantial avalanches to ground were reported near the Lake Louise ski area. The Lipalian slide path produced a size 2.5 and West Bowl avalanched size 2.

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.