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Avalanche Forecast

Archived

Dec 30th, 2022–Dec 31st, 2022

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

Regions

West Island.

Continue to choose simple terrain and avoid avalanche terrain. Storm snow will likely need more time to bond to the underlying crust.

Confidence

High

Avalanche Summary

Observations in this region are limited but we are confident that a natural avalanche cycle has been taking place during the storm. Natural avalanche activity could continue on Saturday.

Snowpack Summary

By mid day Saturday up to 120mm of new precipitation will have formed storm and wind slab at treeline and above as well as isolated features below treeline. The largest and most reactive slabs will be found on northerly aspects. A new crust likely extends from 1000m up to 1600m. Below 1000m the snow surface is still moist.

Once again terrain below treeline has limited or no coverage.

Weather Summary

Friday Night

cloudy with around 15cm of new snow expected at higher elevations. Moderate to strong southwest winds and freezing levels around 1300m.

Saturday

Cloudy with flurries bringing around 5cm of new snow to higher elevations. Moderate to strong westerly winds and freezing level around 1300m.

Sunday

Mostly cloudy with the possibility of light flurries bringing trace amounts of new snow. Light to moderate southeast winds and freezing levels around 900m.

Monday

cloudy with light flurries bringing trace amounts of new snow.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid all avalanche terrain during periods of heavy snowfall.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Be alert to conditions that change with aspect and elevation.

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.