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Avalanche Forecast

Archived

Dec 11th, 2019–Dec 12th, 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.

Snow is expected to continue to fall all day, with strong winds. Storm slabs may become more reactive throughout the day, watch for changing conditions.

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

WEDNESDAY NIGHT - Flurries, 5-10 cm / southwest winds, 30-50 km/h / alpine low temperature near -5

THURSDAY - Flurries, 5-10 cm / west winds 40-60 km/h / alpine high temperature near -3

FRIDAY - Mainly cloudy with scattered flurries / southwest winds, 10-20 km/h / alpine high temperature near -5

SATURDAY - Cloudy with sunny periods and isolated flurries / light northwest winds / alpine high temperature near -6

Avalanche Summary

Strong winds and up to 20 cm of new snow by the end of the day on Thursday could mean that storm slabs form and become more reactive throughout the day.

On Tuesday, there were a reports of natural and human triggered avalanches to size 1.

On Monday, there were reports of explosives triggered avalanches up to size 2.5 on south facing slopes.

Last weekend, there were reports of human and explosives triggered avalanches up to size 2.

Snowpack Summary

5-10 cm of new snow sits on feathery surface hoar in many areas, and on a crust on steep south facing slopes. Another 5-10 cm is forecast to fall throughout the day on Thursday, which could bring total new snow amounts to 20 cm. Forecast strong winds will likely form storm slabs throughout the day, particularly in areas that see upwards of 20 cm of new snow. The bottom half of the snowpack consists of several crusts mixed with sugary facets.

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.