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Avalanche Forecast

Archived

Dec 12th, 2019–Dec 13th, 2019

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

Regions

Kootenay Boundary.

Fresh storm slabs may be reactive to human triggering, especially in wind loaded areas.

Confidence

Moderate - Uncertainty is due to the limited number of field observations.

Weather Forecast

THURSDAY NIGHT - Flurries, 5 cm / southwest winds, 20-40 km/h / alpine low temperature near -5

FRIDAY - Mainly cloudy with isolated flurries / west winds 20-30 km/h / alpine high temperature near -6

SATURDAY - Cloudy with sunny periods and isolated flurries / light northwest winds / alpine high temperature near -7

SUNDAY - A mix of sun and cloud / light northwest winds / alpine high temperature near -10

Avalanche Summary

There were a few human and explosives triggered avalanches size 1-2 reported on Thursday. Check out this MIN report of an avalanche in the Big White Backcountry on Thursday.

Snowpack Summary

10-20 cm of new snow sits on a weak layer of feathery surface hoar in many areas, and on a crust on steep south facing slopes. Recent strong winds have likely formed storm slabs that may be reactive to human triggers. There is a weak layer down approximately 50-60 cm that consists of a crust with sugary faceted snow on top of it. Recent test results indicate that this layer could react to human triggers.

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.