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Avalanche Forecast

Archived

Nov 30th, 2022–Dec 1st, 2022

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

Regions

Lizard-Flathead, Akamina, Flathead, Lizard, Bull.

The storm continues! Avoid avalanche terrain, natural slab avalanches are expected on all aspects at all elevations.

Confidence

High

Avalanche Summary

On Thursday a widespread natural avalanche cycle is expected.

Leading up to Thursday human triggered avalanches using explosives were reported up to size 2.

Snowpack Summary

Upper Snowpack: Heavy snowfall amounts are forecast through Thursday afternoon building widespread fresh and reactive storm slabs. This brings over 60 cm+ of snow over a layer of surface hoar.

Lower Snowpack: Sugary faceted snow with a rain crust just above the ground.

Snowpack depths at treeline are 45 to 75 cm, and in the alpine 65 to 125 cm.

Matt and Connie's video paints a better picture of the snowpack than I can with words. Check it out! And here's their MIN report with a graphed profile.

Weather Summary

Wednesday NightPossible enhanced snowfall amounts 20-35 cm new snow, strong southwest wind, temperatures near -15. Freezing level valley bottom.

Thursday5-15 cm through the day, strong southwest wind and temperatures near -12.

Friday

A mix of sun and clouds, moderate southwest wind and colder temperatures persist -15 to -20.

Saturday

Cloudy with light snow amounts, moderate southwest wind and temperatures warming slightly to -8.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid all avalanche terrain during periods of heavy snowfall.
  • Be aware of the potential for larger than expected storm slabs due to the presence of buried surface hoar.

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.