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Avalanche Forecast

Archived

Feb 23rd, 2021–Feb 24th, 2021

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

Regions

Little Yoho.

We are in the middle of an avalanche cycle and many large avalanches have been observed from control work. Climbers avoid overhead hazard! PLEASE NO SKIING OR CLIMBING ON MT FIELD and MT DENNIS on Wednesday due to avalanche control.

Weather Forecast

Wednesday looks like a beautiful day, with mostly clear skies and the temperature dropping overnight to reach -20 in the morning. Winds should be relatively light out of the NW. On Thursday, overcast skies and light snow returns with up to 5 cm per day for many days in a row. Looks like a long stretch of light snow and clouds coming our way.

Snowpack Summary

The recent storm deposited between 30-40 cm of new snow along with very strong winds and warming temperatures to create widespread storm slabs failing on the Fe 19 facets layer underlying. Expect this snowpack to remain very sensitive to human triggering for the next few days as the snowpack slowly begins settle.

Avalanche Summary

A widespread avalanche cycle is occurring this week, with avalanche control producing large avalanches from almost every target. We have buried the SSV road 200 cm deep x 50 long, hit the creek on Eagle 3, almost hit the road on Whymper South and observed big avalanches in Bosworth. Some natural activity but most avalanches require a trigger.

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.