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Avalanche Forecast

Archived

Dec 1st, 2021–Dec 2nd, 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 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

North Columbia.

As the storm passes hazard is slowly decreasing. Pay close attention to new snow fall amounts, if more then 25cm overnight consider the hazard in the alpine to be high.

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

Wednesday night: Freezing levels will fall slightly to 1800m. Winds will continue to be strong from the Southwest. 10 to 20mm of precipitation throughout the region.

Thursday: Freezing levels will fall to 1200m with some lingering flurries in the wake of the storm. winds will be moderate from the West.

Friday: A ridge of high pressure will mean clear skies and light alpine winds. Freezing level will be at or near valley bottom.

Saturday: Temperature at 1500m -10. light to moderate winds from the Northwest. some light flurries expected.

Avalanche Summary

We suspect a large natural cycle took place on all aspects on Wednesday due to strong winds, freezing levels up too 2200m and moderate precipitation.

Snowpack Summary

The recent storm has formed reactive storm and wind slabs in the alpine and treeline. As the freezing level falls a new crust will form likely up to 1900m.

 

The average snowpack depth at treeline is 250 cm. The mid-November rain crust can be found down 70 to 130 cm and exists around 1900 m and below. 

Terrain and Travel

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.

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.