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Avalanche Forecast

Archived

Dec 22nd, 2016–Dec 23rd, 2016

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 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.

Avalanche Control planned for Kootenay Park on Friday. Please no skiing on Mt Whymper or on the Simpson avalanche paths.

Weather Forecast

Mainly cloudy with isolated flurries for Friday. The strong winds that we have been experiencing over the last few days should decrease on Friday becoming light to moderate from the west. Light flurries forecast for Saturday and the sun should come out for Christmas Day.

Snowpack Summary

The storm has brought us 15 to 30 cm of new snow, with more falling on the West side of the Divide. Moderate to strong winds have created a windslab that overlays a very loose faceted snowpack. The windslab/facet interface was touchy in avalanche control work on Wednesday. The Nov crust is 30-80cm deep, and is not currently reactive.

Avalanche Summary

Explosive control on Wednesday resulted in several avalanches up to Class 3 on Mt. Bosworth. One slope failed when the explosive bag hit the slope. The failure layer is the windslabs on the facets. Not many naturals reported or seen, except for a size 2 over Pilsner climb area on Mt Dennis also on Wednesday.

Confidence

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.