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Avalanche Forecast

Archived

Nov 22nd, 2022–Nov 23rd, 2022

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

Regions

Glacier.

The new snow has buried surface hoar, facets, crust and early season hazards. Expect the new snow to be sensitive to human triggering in steeper terrain.

Knee tweaking and bone-breaking hazards remain shallow in the snowpack, travel with caution, and be prepared to deal with any emergency within your group.

Confidence

Moderate

Avalanche Summary

Expect sluffing in steep terrain where new snow buries surface hoar, facets and crust.

Size 2 avalanche in MacD Gully 10, running to 1/4 fan. Suspect more activity is occurring but have limited visibility.

Snowpack Summary

15-25cm of new snow buries surface hoar (5-30mm), facets, and crust on solar aspects. The surface hoar is largest at and below treeline.

The snowpack is thin and faceted, with an average depth of 50cm below treeline, 80cm at treeline, and up to 120cm in the alpine in loaded areas. These values are below threshold for burying hazards, covering creeks, and bridging crevasses.

Weather Summary

Sandwiched between two weather systems, we will see mainly cloudy skies and no snow on Wednesday. Temps will range from -10 to -5 with 20km/hr SW winds.

Gradually increasing temps and winds into Thursday with more snow (~10cm) arriving early Friday morning.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Potential for wide propagation exists, fresh slabs may rest on surface hoar, facets and/or crust.
  • Carefully assess open slopes and convex rolls where buried surface hoar may be preserved.

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.