UDOT PLANNED AVALANCHE CLOSURES!!

Forecast for the Ogden Area Mountains

Drew Hardesty
Issued by Drew Hardesty on
Sunday morning, December 3, 2023
AVALANCHES ARE OCCURRING NOW.
The avalanche danger is HIGH on many slopes of the upper elevations. The danger is CONSIDERABLE on many slopes at the mid-elevations.
Avalanches can be triggered at a distance and trigger other avalanches in adjacent terrain.
The TRAVEL ADVICE is easy today: Travel in avalanche terrain is not recommended. This includes below avalanche terrain. Remember that traumatic injury is likely with any avalanche involvement this early season.
Low
Moderate
Considerable
High
Extreme
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Special Announcements
Please be aware of uphill travel policies at the ski areas and respect their closures to keep you and their workers safe.
The 5th Annual Avalanche Awareness Week is December 3-10. The week's goal is to save lives through activities that promote avalanche awareness, education, and safety. We have a variety of events around the state. Find an event near you.
Weather and Snow
The Winter Storm Warning continues through Monday morning.

Could a decaying atmospheric river be denied?
It's been a powerhouse: strong wind, heavy dense snowfall, blowing and drifting snow, rising temperatures. And the storm rages on.
Overnight snow and water numbers are 8-12" (1.40" snow water equivalent) with storm totals of roughly 14-20" and 2.50-4.0" of snow water equivalent. Aside from all the snow, winds from the west-northwest have been moderate to strong with anemometers are spinning 25mph gusting 45mph. Mountain temperatures have climbed into the mid to upper 20s.

For today, we'll see continued, albeit diminished, snowfall rates with moderate to strong winds from the west-northwest. Temperatures will be in the mid to upper 20s. I expect an additional 8-14" of snow through tomorrow morning, where the winds, finally, start to lose steam. We start to clear by Monday afternoon with a warming trend pushing mountain temperatures into the upper 30s to upper 40s (mid-elevations) by Tuesday. A weak system follows for Thursday.
Recent Avalanches
Ski area control work along the Ogden skyline produced many soft slab avalanches breaking into the old snow from October/November. Many of these avalanches were triggered at a distance with collapsing and cracking the rule and not the exception.
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Avalanche Problem #1
Persistent Weak Layer
Type
Location
Likelihood
Size
Description
If traveling to the upper elevations, you will be able to trigger large avalanches at a distance today that fracture down into the old weak snow from October/November. This weak basal stack of cards exists primarily on westerly to northerly to easterly aspects These avalanches may be 2-3' deep and hundreds of feet wide. They are not to be messed with. Cracking and collapsing state the obvious, as it were, but the only prudent terrain choices are on low angle terrain today.
Avalanche Problem #2
Wind Drifted Snow
Type
Location
Likelihood
Size
Description
You'll find an endless supply of soft slabs of wind drifted snow in a variety of encatchment areas, both along the ridgelines and well below. These large smooth pillows may be up to 3' deep or more in exposed terrain and will also be sensitive to the weight of a backcountry traveler. Be aware that the cornices are growing and becoming unstable - any cornice fall is likely to trigger an avalanche below.
Avalanche Problem #3
New Snow
Type
Location
Likelihood
Size
Description
Heavy dense snowfall is coming in on a warming trend and is "upside-down"; that is - higher density snow falling on lower density snow - and it's a recipe for trouble. Similarly, rain on snow at the lowest elevations will lead to unstable wet snow conditions. Shooting cracks are a clear sign of instability (Brackelsberg photo)
Additional Information

Forecaster's Corner:
Matsuo Bashō lived in Japan from 1644-1694 and is often viewed as the the avalanche hunter's favorite poet. His most famous haiku, below.
❄️
Come, let's go
Snow-viewing
Til we're buried.
General Announcements
This information does not apply to developed ski areas or highways where avalanche control is normally done. This forecast is from the U.S.D.A. Forest Service, which is solely responsible for its content. This forecast describes general avalanche conditions and local variations always occur.