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Avalanche Forecast

Archived

Mar 12th, 2020–Mar 13th, 2020

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

Regions

Glacier.

Be conservative in your terrain selection and give the snowpack time to adjust to the recent storm snow load.

Weather Forecast

Cloudy with sunny periods, isolated flurries with a trace of precipitation. Alpine temperature a high -11 °C with W ridge wind at 10-25km/h and an 800m freezing level.  Friday calls for mainly cloudy sky with isolated flurries, a trace of snow ridge wind E at 30km/h and a high of -18C, brrrrrr!

Snowpack Summary

25-30cm of snow and mod/strong SW winds in the last 48hrs has created a reactive storm slab. The new snow sits on a thin suncrust on solar aspects and small surface hoar on N'ly aspects. Below this slab, the Feb 22nd persistent weak layer is down 80-120cm, and consists of 3-7mm surface hoar on all aspects up to 2450m, and a crust on solar aspects.

Avalanche Summary

Yesterday's avalanche cycle produced natural avalanches to size 3 and controlled avalanches to size 3.5 in the highway corridor. The slides from avalanche control were mainly confined to the storm snow with Camp West path possibly digging deeper.

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.

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.