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Avalanche Forecast

Archived

Nov 25th, 2022–Nov 26th, 2022

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

Regions

Glacier.

Fresh storm slabs may remain reactive to snow sliders on Saturday, a cautious approach to steep smooth slopes is recommended.

There are still many early season hazards, like rocks and stumps, just below the snow surface. Don't let those boards run just yet.

Confidence

Moderate

Avalanche Summary

Debris from several large avalanches was observed in the runouts of the MacDonald gullies on Friday. Poor visibility likely hid an avalanche cycle at upper elevations from view.

On Thursday, a size 1.5 slab was observed from just lookers left of the Grizzly couloir.

Snowpack Summary

Up to 20cm and counting has fallen today, Friday, and has built fresh storm slabs in smooth terrain.

As storm snow continues to pile up, it may overload the weak November 17th layer of surface hoar (5-30mm), facets, and crust. This buried surface hoar is largest at and below treeline, and will likely become a persistent avalanche problem as it gets more deeply buried over the weekend.

The early season snowpack is thin and variable, with an average depth of 50cm at the parking lots, just over a meter at treeline, and up to 130cm in the alpine. These values are below threshold for burying hazards, covering creeks, and bridging crevasses.

Weather Summary

There will be a brief break between systems Friday night into Saturday morning.

A cold front from the NW will bring more snowfall starting Saturday evening, with an additional 15-25cm of accumulation by Sunday evening.

An Arctic high will bring clearing skies and plummeting temps into next week.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Don't be too cavalier with decision making, storm slabs may remain sensitive to human triggering.
  • Early season avalanches at any elevation have the potential to be particularly dangerous due to obstacles that are exposed or just below the surface.

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.