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Avalanche Forecast

Archived

Dec 29th, 2022–Dec 30th, 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 possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

West Island.

New storm and wind slabs will build throughout the day. These new slabs likely won't bond well to the underlying crust. Avalanche terrain should be avoided.

Confidence

High

Avalanche Summary

Observations are limited in this region. We suspect that natural storm slab activity will occur on Friday.

Snowpack Summary

Up to 40cm of new snow has likely 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 could still be moist.

Once again terrain below treeline has limited or no coverage.

Weather Summary

Thursday Night

Stormy with around 30mm of new precipitation . Moderate southeast winds and Freezing levels rising to 1400m.

Friday

Stormy with up to 70mm of new precipitation expected. Moderate to strong southwest winds and freezing levels around 1400m.

Saturday

Cloudy with light flurries bringing up to 5mm of new precipitation. Light to moderate westerly winds and freezing level around 1200m.

Sunday

Mostly cloudy with the possibility of light flurries bringing trace amounts of new snow. Light southerly winds and freezing levels around 1100m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid all avalanche terrain during periods of heavy snowfall.
  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • 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.