Avalanche Forecast

Archived

Dec 23rd, 2019–Dec 24th, 2019

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.

Regions

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Expect quiet weather through Tuesday as the snowpack continues to adjust to the significant load of recent storm snow. You can still trigger a large avalanche on slopes steeper than 35 degrees at upper elevations. Bring a conservative approach, and evaluate the snowpack carefully before venturing into steeper terrain.

Discussion

We are only 48hrs removed from the most impressive storm so far this winter and a widespread avalanche cycle. Numerous natural and triggered avalanches to size D3 occurred Friday and Saturday. Since Sunday, precipitation ended, the storm snow settled significantly, and natural avalanche activity tapered off. However, the snowpack is still adjusting to the 3-4ft+ of snow (7.5in water) we received December 18-21.

In addition, there are many areas of deep, unconsolidated snow. With these conditions, snow immersion and treewell accidents are common. Travel with a partner and keep them in sight. Find out more information here.

Snowpack Discussion

New Regional Synopsis coming soon. We update the Regional Synopsis every Thursday at 6 pm.

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.