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Avalanche Forecast

Archived

Dec 22nd, 2019–Dec 23rd, 2019

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

Regions

South Coast.

The recent snow is likely stabilizing but may need a bit longer at higher elevations.

Confidence

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

Weather Forecast

SUNDAY NIGHT: Clear skies, light northwest wind, treeline temperature -1 C, freezing level 1100 m.

MONDAY: Clear skies, light west wind, treeline temperature -3 C, freezing level 700 m.

TUESDAY: Cloudy with light snowfall, accumulation 1 to 3 cm, light southwest wind, treeline temperature -3 C, freezing level 600 m.

WEDNESDAY: Cloudy with light snowfall, accumulation 2 to 5 cm, light west wind, treeline temperature -3 C, freezing level 600 m.

Avalanche Summary

A widespread avalanche cycle occurred on Friday during the peak of the storm. Avalanche activity is expected to decrease as the weather cools.

Snowpack Summary

Around 50 to 100 cm of snow fell in the past few days. Above around 1200 m, all of this likely fell as snow and rests on a hard melt-freeze crust. Below around 1200 m, rain soaked the snow which has now produced a crunchy melt-freeze crust on the surface.

Terrain and Travel

  • Be careful as you transition into wind affected terrain.
  • Avoid exposure to overhead hazards when solar radiation is strong.

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.