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Avalanche Forecast

Archived

Nov 16th, 2020–Nov 17th, 2020

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

Regions

Glacier.

The storm slab over the Nov crust (a slick sliding layer) continues to stiffen. Watch for cracking around your skis/board; this is an indication that the slab may be failing.

And do look out for the rocks/stumps/open creeks in this young snowpack!

Weather Forecast

Flurries today, followed by rapid warming Tues, then cooler, unsettled weather Wed

Today: flurries with trace amounts, FZL near 1400m, light/mod S winds in alpine

Tonight: flurries, 7cm, FZL dropping to 1100m, light/mod S winds

Tues: flurries with FZL rising to 2700m, strong gusty S winds

Wed: snow, 20cm, FZL dropping to 1500m, strong SW winds

Snowpack Summary

Moderate to strong southerly winds have redistributed the 30-60cm that now overlays the Nov 5th crust. At treeline, the snowpack consists of a series of crusts with weaker snow surrounding the crusts. The strong Nov 5th crust reaches as high as 2500m, and potentially higher on steep solar aspects.

Avalanche Summary

Natural avalanche activity died down Sunday, with a few isolated storm slabs noted from the N side of Macdonald. However, a skier accidental with a full burial occurred Saturday up Connaught Creek, where the storm slab was initiated on the Nov 5th crust. If you observe an avalanche or concerning conditions, consider sharing on the AvCan MIN site.

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.