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Avalanche Forecast

Archived

Dec 19th, 2019–Dec 20th, 2019

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

Regions

South Coast.

Substantial snowfall is forecast Thursday night, which may trigger a natural avalanche cycle. Best to avoid all avalanche terrain on Friday until this snow stabilizes.

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

THURSDAY NIGHT: Cloudy with heavy snowfall, accumulation 40 to 50 cm, strong southwest wind, treeline temperature 0 C, freezing level 1000 m rising to 1500 m.

FRIDAY: Cloudy with light snowfall, accumulation 2 to 5 cm, moderate southwest wind, treeline temperature -1 C, freezing level 1200 m.

SATURDAY: Cloudy with snowfall, accumulation 10 to 20 cm, light to moderate southwest wind, treeline temperature -2 C, freezing level 1000 m.

SUNDAY: Cloudy with snowfall and afternoon clearing, accumulation 10 to cm, light southeast wind, treeline temperature -1 C, freezing level 1200 m.

Avalanche Summary

A natural avalanche cycle is likely to occur on Thursday night. Natural and human-triggered avalanches are likely to occur on Friday and into the weekend until all this new snow bonds to underlying layers.

Snowpack Summary

Upwards of 50 cm of more new snow is expected to fall Thursday night, adding to the 40 to 50 cm that fell on Wednesday night. A natural avalanche cycle is likely underway.

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.