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Avalanche Forecast

Archived

Dec 21st, 2019–Dec 22nd, 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

SATURDAY NIGHT: Partly cloudy, light southwest wind, treeline temperature -2 C, freezing level 900 m.

SUNDAY: Mostly clear skies, light southeast wind, treeline temperature -1 C, freezing level 1000 m.

MONDAY: Mix of sun and cloud, light west wind, treeline temperature -4 C, freezing level 500 m.

TUESDAY: Cloudy with snowfall, accumulation 5 to 10 cm, moderate southwest wind, treeline temperature -3 C, freezing level 600 m.

Avalanche Summary

A widespread avalanche cycle occurred on Friday. 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 whereas rain has likely soaked the snow at lower elevations and stabilized it. This substantial amount of new snow will require a few days to stabilize at higher elevations.

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.