Forecast for the Ogden Area Mountains

Issued by Drew Hardesty for Wednesday, December 12, 2018 - 6:58am
It'll be a day of rising avalanche danger. Many areas will start off with a LOW danger this morning. By late morning, the danger will trend toward MODERATE for new and developing wind drifts and new snow avalanches. Wind drifts will be more prominent on steep north to east to southeast facing slopes but also cross-loaded into gullies and couloirs...as well as other aspects.
Low
Moderate
Considerable
High
Extreme
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Weather and Snow
A sharp cold front is on the doorstep. I'll get right to the point. We can expect to see 4-8"+ in the mountains and finally get rid of the junk in the valleys. It's too much.
This morning, skies are overcast, temps are in the mid to upper 20s, and pre-frontal southwest winds are blowing 20-25mph with gusts to 30. The most exposed anemometers have wind speeds in the 30s, gusting to near 50.
Post-frontal, however, the winds veer back to the northwest and remain moderate to strong for much of the day...finally losing steam by late afternoon. It'll be a day of rising hazard.
Recent Avalanches
There were no reports of avalanche activity or other obvious signs of instability from the backcountry yesterday. Only along the Ogden skyline were avalanche control teams able to pry out some stiff and stubborn hard slabs with explosives.
I suspect there'll be more in this department for tomorrow's forecast.
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Avalanche Problem #1
Wind Drifted Snow
Type
Location
Likelihood
Size
Description
Expect to find developing wind drifts on a variety of aspects at the mid and upper elevations. The gusty northwest winds will wreak havoc with the low density snow. These drifts will get larger as the day grows on and will be sensitive to human weight. Look for rounded drifts to the lee of ridgelines and cross-loaded into gullies and around rocky outcrops. By early evening, drifts may be up to a foot deep or more.
Avalanche Problem #2
New Snow
Type
Location
Likelihood
Size
Description
New snow avalanches are particularly prone during times of higher precipitation intensity..which may be by mid to late morning today. Natural sluffing may be possible at these times.
Additional Information
Help us verify our forecasts and let us know what you see out and about in the backcountry. Trigger an avalanche? Hear a whumph? Submitting observations is easy. Click on Observations and Avalanches in the menu bar at the top or from the convenience of your smartphone. I'll run you through the smartphone observation in the video below.
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.

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