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Avalanche Forecast

Archived

Jan 4th, 2020–Jan 5th, 2020

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

Regions

South Coast.

An intense storm will load the mountains with snow, making very dangerous avalanche conditions. Travel in avalache terrain is not recommended on Sunday.

Confidence

High -

Weather Forecast

SATURDAY NIGHT: Cloudy with snowfall, accumulation 25 to 35 cm, moderate to strong southwest wind, treeline temperature -2 C, freezing level 800 m.

SUNDAY: Cloudy with snowfall, accumulation 15 to 25 cm, strong southwest wind, treeline temperature -2 C, freezing level 800 m.

MONDAY: Cloudy with snowfall, accumulation 10 cm, light southwest wind, treeline temperature -4 C, freezing level 500 m.

TUESDAY: Cloudy with rain, accumulation 70 to 80 mm, strong southwest wind, treeline temperature 2 C, freezing level 1700 m.

Avalanche Summary

There have not been many observations due to the stormy weather, but it is expected that many loose wet avalanches occurred at lower elevations on Friday and storm slab avalanches released at higher elevations. Storm slab avalanches are expected to be very likely to occur on Saturday night and Sunday.

Snowpack Summary

Around 40 to 60 cm of snow is forecast to fall above 800 m Saturday night and Sunday. This snow may not bond well to underlying layers of wet snow at lower elevations and either a melt-freeze crust or hard wind-affected surfaces at higher elevations.

Terrain and Travel

  • Avoid all avalanche terrain during periods of heavy loading from new snow and wind.
  • Avoid the runout zones of avalanche paths. Avalanches could run full path.

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.