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Avalanche Forecast

Archived

Jan 9th, 2021–Jan 10th, 2021

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

The weather pattern is set to change on Sunday, with warm temperatures and precipitation in the forecast.

Confidence

Moderate - Forecast precipitation (either snow or rain) amounts are uncertain.

Weather Forecast

Saturday Night: Wet flurries, accumulation 5-10 cm, moderate to strong southwest wind, treeline high temperature -2, freezing level 800 m.

Sunday: Flurries or rain showers, moderate southwest wind, treeline high temperature near 1 C, freezing level 1200 m.

Monday: Snow or rain, accumulation 15-20 cm, moderate to strong southwest wind, treeline high temperature 3 C, freezing level 1500 m.

Tuesday: Heavy rain or snow, strong west wind, treeline high temperature 5 C freezing level 1600 m.

Avalanche Summary

On Friday there were reports of loose dry and wet avalanches running to to size 1. This MIN post outlines the conditions nicely on Friday.

Snowpack Summary

Up to 10 cm of new snow falling on Friday at uppermost elevations has likely been wind affected. this snow snow sits on a crust. Below the 1200 m elevation band the snow surface is likely moist, wet or refrozen as a surface crust. 

The remainder of the snowpack is well consolidated.

Terrain and Travel

  • Be careful as you transition into wind affected terrain.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.