Alert archive / Georgia / Dense Fog Advisories in 2021

Dense Fog Advisory 11, NWS Atlanta, GA

August 23, 202134 counties in Georgia

NWS Atlanta, GA issued this dense fog advisory at Aug 23, 2021, 7:49 AM EDT for 34 counties in Georgia. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: Aug 23, 2021, 7:49 AM EDT (11:49 UTC)
Expired: Aug 23, 2021, 10:00 AM EDT
In force: 2 hr
Issued by: NWS Atlanta, GA

All 34 counties

Baldwin County, GA, Bibb County, GA, Butts County, GA, Clayton County, GA, Cobb County, GA, Crawford County, GA, DeKalb County, GA, Fayette County, GA, Fulton County, GA, Glascock County, GA, Greene County, GA, Hancock County, GA, Henry County, GA, Houston County, GA, Jasper County, GA, Jefferson County, GA, Jones County, GA, Lamar County, GA, Monroe County, GA, Morgan County, GA, Newton County, GA, Oglethorpe County, GA, Peach County, GA, Pike County, GA, Putnam County, GA, Rockdale County, GA, Spalding County, GA, Taliaferro County, GA, Twiggs County, GA, Upson County, GA, Warren County, GA, Washington County, GA, Wilkes County, GA, Wilkinson County, GA

The radar

The Robins AFB radar (KJGX), 70 km from the middle of the area, began a volume at 11:46 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 11.8 hours before the alert went out and 81 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: 48 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 992 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 23, 7:40 AM EDT, 9 minutes earlier.

Area forecast discussion, Aug 23, 7:40 AM EDT, 9 minutes before

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Hazardous weather outlook, Aug 23, 5:27 AM EDT, 2 hours 22 minutes before

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In the hours before

Special weather statement, Aug 23, 4:08 AM EDT, 3 hours 41 minutes before

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Special weather statement, Aug 23, 5:20 AM EDT, 2 hours 29 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
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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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The office that day

Everything else NWS Atlanta, GA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 22, 8:56 PM EDT	Special Weather Statement	FFC	Emanuel, Treutlen	34 min
Aug 22, 8:59 PM EDT	Special Weather Statement	FFC	Bleckley, Dodge, Laurens	31 min
Aug 22, 10:05 PM EDT	Special Weather Statement	FFC	Laurens, Treutlen	25 min
Aug 23, 7:54 PM EDT	Special Weather Statement	FFC	Webster	21 min

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.