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Avalanche Forecast

Archived

Dec 22nd, 2021–Dec 23rd, 2021

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

Regions

Glacier.

Avalanche control is planned for Wednesday night into Thursday. See Drive BC for more info.

A wise guide once said, "with great powder comes great responsibility". Currently, we have great powder, please recreate responsibly.

Weather Forecast

December is delivering with another 30cm's of storm snow to fall by Thursday morning! Temperatures will rise slightly to near -8c and the winds should be moderate gusting strong overnight Wednesday into Thursday. Flurries, very cold temperatures, and light to moderate winds are forecasted for the rest of the week.

Snowpack Summary

30cm of new snow is forecast to fall by Thursday morning, plus we received another 30cm last Saturday, bringing our total new snow in December to nearly 200cm! The December 1st crust is buried approximately 80cm-150cm, with weaker sugary snow directly above and below. Beneath the Dec 1st crust facet combo, the snowpack is dense and strong.

Avalanche Summary

Strong winds, new snow, and warming temperatures triggered a Natural Avalanche Cycle on Wednesday morning. Natural Avalanche activity is expected to decline slightly Wednesday afternoon, then pickup again Wednesday night into Thursday afternoon. Human triggered avalanches are likely in steep unsupported terrain.

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.

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.