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Avalanche Forecast

Archived

Dec 20th, 2021–Dec 21st, 2021

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

Regions

Northwest Coastal.

Use extra caution near ridge crests and steep roll overs. New storm and wind slab will form throughout the day as a result of the incoming weather.

Confidence

Moderate -

Weather Forecast

Monday night: No new snow expected. Low of -19 at 900m. Moderate to strong Northwest winds.

Tuesday: 15cm of new snow with strong Southwest winds. High of -12 at 900m.

Wednesday: some flurries with light North winds. High of -10 at 900m.

Thursday: no new snow expected. Light to moderate North wind and a high of -14 at 900m.

Avalanche Summary

Several Loose dry avalanches to size 2 were observed on Westerly aspects.

Explosives triggered several size 2.5 avalanches on lee and cross loaded features on Southerly aspects at 1700m.

Snowpack Summary

Variable winds over the last week mean wind slab could be found on all aspects in exposed terrain. 

The December 18th surface hoar/facet layer is down 15cm.

The December 7 persistent weak layer is now typically down 50-70 cm, though some professional operations are saying that it is getting harder to find. This interface may include a crust, facets, or surface hoar.

Snowpack depths vary greatly across the region, expect to find anywhere from 100-300 cm of snow around treeline.

Terrain and Travel

  • Carefully assess open slopes and convex rolls where buried surface hoar may be preserved.
  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Watch for fresh storm slabs building throughout the day.

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.