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Avalanche Forecast

Archived

Dec 28th, 2024–Dec 29th, 2024

Alpine
Natural avalanches possible, human triggered probable.
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, 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.

Regions

Glacier.

So much unconsolidated snow!

Expect small loose dry and soft storm slab avalanches in steep terrain, and be extra cautious in any areas where the wind has stiffened the upper snowpack

Confidence

Moderate

Avalanche Summary

Reports continue to trickle in of wind effect, shooting cracks, and isolated avalanches in steep open terrain at upper elevations.

There was a size 2 skier triggered wind slab below the Asulkan hut on Thursday afternoon. The slab was 30-50cms deep and 40m wide.

The operations around us are also reporting a mix of wind slab and stormslabs as well as sluffing in steep terrain.

Snowpack Summary

Recent stormy weather has deposited a meter of new snow over the last week. New snow and Light to Moderate SW winds continue to build fresh slabs in specific features (ridge lee areas, open cross-loaded slopes, convex rolls).

A notable layer is down 90-120cm. This interface has been dormant for weeks, but consists of surface hoar in sheltered locations, and a sun crust on solar aspects. The snowpack's base is comprised of several early-season melt-freeze rain crusts

Weather Summary

A weakened front will continue to produce light snowfall through this evening.

Tonight Flurries (up to 10cm). Alpine low -7°C. Light Southwest ridgetop wind.

Sun Isolated flurries, trace snowfall. Alpine High -7°C. Light West winds. Freezing level (FZL) 1200m.

Mon Isolated flurries, trace snow. Alpine Low -11 °C, High -9 °C. Light West wind.

Tues Sunny periods. Alpine Low -13 °C, High -11 °C. Light SW wind.

Terrain and Travel Advice

  • Loose avalanches may start small, but they can grow and push you into dangerous terrain.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Wind slabs are most reactive during their formation.

Problems

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.

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.