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Avalanche Forecast

Archived

Dec 23rd, 2019–Dec 24th, 2019

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

Regions

South Coast.

Keep your guard up at higher elevations. Observations since the storm are limited and recently wind loaded areas remain a concern.

Confidence

High -

Weather Forecast

Monday night: Cloudy. Light southwest winds.

Tuesday: Cloudy with isolated flurries and a trace to 5 cm of new snow, continuing overnight. Alpine high temperatures around -5 with freezing levels to 700 metres.

Wednesday: Becoming sunny. Light northeast winds. Alpine high temperatures around -4 with freezing levels rising to 1000 metres.

Thursday: Mainly sunny. Light to moderate southwest winds. Alpine high temperatures around -3 with freezing levels to 700 metres.

Avalanche Summary

A widespread avalanche cycle occurred on Friday during the peak of the storm. Although natural avalanche activity has now likely decreased, the potential for human triggered avalanches in wind loaded areas at higher elevations remains a concern.

Snowpack Summary

Around 50 to 100 mm of precipitation fell at the end of last week. Above around 1200 m, this precipitation fell as 50-100 cm of snow. All this recent snow may take a few days to form a solid bond with the hard melt-freeze crust it buried.

Below around 1200 metres, rainfall over the same period has now refrozen and produced a crunchy melt-freeze crust on the surface.

Terrain and Travel

  • Be careful as you transition into wind affected terrain.
  • Carefully evaluate steep lines for wind slabs.

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.