Alert archive / Georgia / Dense Fog Advisories in 2021

Dense Fog Advisory 18, NWS Atlanta, GA

December 10, 202172 counties in Georgia

NWS Atlanta, GA issued this dense fog advisory at Dec 10, 2021, 4:44 PM EST for 72 counties in Georgia. It took effect at Dec 10, 2021, 5:00 PM EST. It was in force for 17 hr.

The area

The counties it named.

The facts

Issued: Dec 10, 2021, 4:44 PM EST (21:44 UTC)
In effect from: Dec 10, 2021, 5:00 PM EST
Expired: Dec 11, 2021, 10:00 AM EST
In force: 17 hr
Issued by: NWS Atlanta, GA

All 72 counties

Baldwin County, GA, Banks County, GA, Barrow County, GA, Bartow County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Carroll County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Crawford County, GA, Crisp County, GA, Dawson County, GA, DeKalb County, GA, Dodge County, GA, Dooly County, GA, Douglas County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Glascock County, GA, Greene County, GA, Gwinnett County, GA, Hall County, GA, Hancock County, GA, Haralson County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Jackson County, GA, Jasper County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Laurens County, GA, Lumpkin County, GA, Macon County, GA, Madison County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Peach County, GA, Pickens County, GA, Pike County, GA, Polk County, GA, Pulaski County, GA, Putnam County, GA, Rockdale County, GA, Spalding County, GA, Sumter County, GA, Taliaferro County, GA, Telfair County, GA, Troup County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Wheeler County, GA, White County, GA, Wilcox County, GA, Wilkes County, GA, Wilkinson County, GA

The radar

The Atlanta radar (KFFC), 68 km from the middle of the area, began a volume at 21:49 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.7 hours before the alert went out and 274 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 39 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 463 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 254 m²/s²
0-3 km storm-relative helicity: 238 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this dense fog advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Atlanta, GA wrote its last area forecast discussion before this dense fog advisory went out at Dec 10, 2:30 PM EST, 2 hours 14 minutes earlier.

Area forecast discussion, Dec 10, 2:30 PM EST, 2 hours 14 minutes before

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Hazardous weather outlook, Dec 10, 5:17 AM EST, 11 hours 27 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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Nearby

Dense Fog Advisories in Georgia, 2021 Every dense fog advisory in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.