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Avalanche Forecast

Archived

Dec 7th, 2024–Dec 8th, 2024

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
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 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.

Regions

Glacier.

A significant amount (60cms!) of new snow has fallen on a mix of surface hoar and sun-crust in the past 24-48 hours.

Human triggered avalanches are very likely.

Confidence

Moderate

Avalanche Summary

A natural avalanche cycle is currently underway with highway avalanche control occurring at the time of writing this bulletin.

Earlier in the week we saw multiple loose wet avalanches up to size 1.5 from the warming temps.

Snowpack Summary

60cm of new snow sits on a layer of surface hoar. In the alpine & tree-line elevation bands, this new snow sits on a sun crust on steep solar aspects.

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

The Storm continues through Saturday night bringing more new snow and a spike in the wind.

Tonight: 15cms. Alp low -9°C, Strong to Extreme West winds, Freezing Level (FZL) valley bottom.

Sun: Trace precip, Alp high -8°C, Moderate SW winds, , FZL 1000m

Mon: Cloudy with flurries, Alp high -6°C, light W winds. FZL valley bottom.

Tues: Cloudy with sunny periods, Alp high -10°C, Light SW winds, FZL valley bottom.

Terrain and Travel Advice

  • Avoid avalanche terrain during periods of heavy snowfall.
  • Make conservative terrain choices and avoid overhead hazard.
  • 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.