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Avalanche Forecast

Archived

Dec 8th, 2024–Dec 9th, 2024

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

Regions

Glacier.

60-80cm of new snow in the last 2 days has changed the landscape significantly. This new snow overlies surface hoar or a sun crust; both problematic layers that promote poor bonding and easy sliding.

Human triggered avalanches are possible to likely on slopes that did not previously avalanche during the storm.

Confidence

Moderate

Avalanche Summary

The natural cycle has tapered off with the passage of the storm, revealing numerous sz 2-3 avalanches from all aspects failing at the base of the storm snow interface.

Artillery control produced excellent results on Tupper and Macdonald Sat night, with most shots producing sz 2 to sz 3 avalanches from steep start zones, running out onto valley bottom fans. Debris moved fast, likely picking up speed and mass on the buried surface hoar.

Snowpack Summary

Up to 65cm of new snow sits on a sun crust on steep solar aspects. In sheltered locations, this new snow sits atop large surface hoar. Strong winds Sat PM will have promoted surface slab conditions on exposed Treeline and Alpine slopes.

There is a dense, well-settled mid-pack without any significant weak layers.

The Nov 9 crust is down 1-1.5m. The base of the snowpack is comprised of several dense, melt-freeze rain crusts formed in October.

Weather Summary

A ridge of high pressure will bring calmer conditions.

Tonight: Cloudy, isolated flurries. Alp low -10°C, light W winds, Freezing Level (FZL) valley bottom.

Mon: Cloudy with sun and flurries, Alp high -10°C, light W winds, FZL 600m.

Tues: Cloudy with sunny periods, Alp high -4°C, light W winds, FZL 800m.

Wed: Clouds, isolated flurries, Alp high -4°C, light SW winds, FZL 1300m.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Make conservative terrain choices and avoid overhead hazard.

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.