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

Regions

South Coast Inland.

With continued snow and wind expected throughout the day on Thursday, storm slabs may become more reactive throughout the day.  

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

WEDNESDAY NIGHT - Snow, 5-10 cm / southwest winds, 30-50 km/h / alpine low temperature near -2 / freezing level 1100 m

THURSDAY - Snow, 5-15 cm / southwest winds 30-50 km/h / alpine high temperature near -3 / freezing level 1200 m

FRIDAY - Cloudy with scattered flurries, 5 cm / southwest winds, 10-20 km/h / alpine high temperature near -4 / freezing level 1000 m

SATURDAY - Cloudy with sunny periods and isolated flurries / light southwest winds / alpine high temperature near -5 / freezing level 800 m

Avalanche Summary

New snow and wind will mean that storm slabs are likely forming and chances are good that they will become more reactive throughout the day on Thursday.

Snowpack Summary

5-10 cm of new snow from Wednesday right likely sits on a weak layer of feather surface hoar. Another 5-15 cm is expected throughout the day, bringing total new snow amounts to 10-25 cm. The middle of the snowpack contains a mix of hard crusts and facet/crust layers. Snowpack depths remain very shallow throughout the region with about 75-100 cm at upper treeline elevations. Below treeline terrain is below the threshold for avalanches.

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.