Alert archive / Georgia / Dense Fog Advisories in 2021
Dense Fog Advisory 21, NWS Atlanta, GA
NWS Atlanta, GA issued this dense fog advisory at Dec 17, 2021, 9:27 PM EST for 62 counties in Georgia. It took effect at Dec 17, 2021, 10:00 PM EST. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Dec 17, 2021, 9:27 PM EST (02:27 UTC)
- In effect from
- Dec 17, 2021, 10:00 PM EST
- Expired
- Dec 18, 2021, 10:00 AM EST
- In force
- 12 hr
- Issued by
- NWS Atlanta, GA
All 62 counties
Baldwin County, GA, Banks County, GA, Barrow County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Clarke County, GA, Crawford County, GA, Crisp County, GA, Dodge County, GA, Dooly County, GA, Emanuel County, GA, Glascock County, GA, Greene County, GA, Hall County, GA, Hancock 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, Marion County, GA, Monroe County, GA, Montgomery County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Peach County, GA, Pike County, GA, Pulaski County, GA, Putnam County, GA, Rockdale County, GA, Schley County, GA, Spalding County, GA, Sumter County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Telfair County, GA, Toombs County, GA, Towns County, GA, Treutlen County, GA, Twiggs County, GA, Union County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Webster County, GA, Wheeler County, GA, White County, GA, Wilcox County, GA, Wilkes County, GA, Wilkinson County, GA
The radar
The Robins AFB radar (KJGX), 48 km from the middle of the area, began a volume at 02:27 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, 2.5 hours before the alert went out and 97 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.
- Mixed-layer CAPE
- 8 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 557 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 168 m²/s²
- 0-3 km storm-relative helicity
- 170 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
642 WWUS72 KFFC 180227 NPWFFC URGENT - WEATHER MESSAGE National Weather Service Peachtree City GA 927 PM EST Fri Dec 17 2021 GAZ008-009-015-016-023>025-027-035>039-046>051-056>062-068>076- 079>086-091>098-103>113-181500- /O.NEW.KFFC.FG.Y.0021.211218T0300Z-211218T1500Z/ Union-Towns-Lumpkin-White-Hall-Banks-Jackson-Madison-Barrow- Clarke-Oconee-Oglethorpe-Wilkes-Rockdale-Walton-Newton-Morgan- Greene-Taliaferro-Spalding-Henry-Butts-Jasper-Putnam-Hancock- Warren-Pike-Upson-Lamar-Monroe-Jones-Baldwin-Washington-Glascock- Jefferson-Talbot-Taylor-Crawford-Bibb-Twiggs-Wilkinson-Johnson- Emanuel-Marion-Schley-Macon-Peach-Houston-Bleckley-Laurens- Treutlen-Webster-Sumter-Dooly-Crisp-Pulaski-Wilcox-Dodge-Telfair- Wheeler-Montgomery-Toombs- Including the cities of Dahlonega, Cleveland, Gainesville, Athens, Conyers, Covington, Griffin, Milledgeville, Macon, Swainsboro, Warner Robins, Dublin, Americus, Cordele, and Vidalia 927 PM EST Fri Dec 17 2021 ...DENSE FOG ADVISORY IN EFFECT UNTIL 10 AM EST SATURDAY... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Portions of central, east central, north central, northeast, southeast and west central Georgia. * WHEN...Until 10 AM EST Saturday. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$
2 follow-up statements
718 WWUS72 KFFC 180850 NPWFFC URGENT - WEATHER MESSAGE National Weather Service Peachtree City GA 350 AM EST Sat Dec 18 2021 GAZ008-009-015-016-023>025-027-035>039-046>051-056>062-068>076- 079>086-091>098-103>113-181500- /O.CON.KFFC.FG.Y.0021.000000T0000Z-211218T1500Z/ Union-Towns-Lumpkin-White-Hall-Banks-Jackson-Madison-Barrow- Clarke-Oconee-Oglethorpe-Wilkes-Rockdale-Walton-Newton-Morgan- Greene-Taliaferro-Spalding-Henry-Butts-Jasper-Putnam-Hancock- Warren-Pike-Upson-Lamar-Monroe-Jones-Baldwin-Washington-Glascock- Jefferson-Talbot-Taylor-Crawford-Bibb-Twiggs-Wilkinson-Johnson- Emanuel-Marion-Schley-Macon-Peach-Houston-Bleckley-Laurens- Treutlen-Webster-Sumter-Dooly-Crisp-Pulaski-Wilcox-Dodge-Telfair- Wheeler-Montgomery-Toombs- Including the cities of Dahlonega, Cleveland, Gainesville, Athens, Conyers, Covington, Griffin, Milledgeville, Macon, Swainsboro, Warner Robins, Dublin, Americus, Cordele, and Vidalia 350 AM EST Sat Dec 18 2021 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 10 AM EST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Portions of central, east central, north central, northeast, southeast and west central Georgia. * WHEN...Until 10 AM EST Saturday. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$
905 WWUS72 KFFC 181503 NPWFFC URGENT - WEATHER MESSAGE National Weather Service Peachtree City GA 1003 AM EST Sat Dec 18 2021 GAZ008-009-015-016-023>025-027-035>039-046>051-056>062-068>076- 079>086-091>098-103>113-181615- /O.EXP.KFFC.FG.Y.0021.000000T0000Z-211218T1500Z/ Union-Towns-Lumpkin-White-Hall-Banks-Jackson-Madison-Barrow- Clarke-Oconee-Oglethorpe-Wilkes-Rockdale-Walton-Newton-Morgan- Greene-Taliaferro-Spalding-Henry-Butts-Jasper-Putnam-Hancock- Warren-Pike-Upson-Lamar-Monroe-Jones-Baldwin-Washington-Glascock- Jefferson-Talbot-Taylor-Crawford-Bibb-Twiggs-Wilkinson-Johnson- Emanuel-Marion-Schley-Macon-Peach-Houston-Bleckley-Laurens- Treutlen-Webster-Sumter-Dooly-Crisp-Pulaski-Wilcox-Dodge-Telfair- Wheeler-Montgomery-Toombs- Including the cities of Dahlonega, Cleveland, Gainesville, Athens, Conyers, Covington, Griffin, Milledgeville, Macon, Swainsboro, Warner Robins, Dublin, Americus, Cordele, and Vidalia 1003 AM EST Sat Dec 18 2021 ...DENSE FOG ADVISORY HAS EXPIRED... Visibilities continue to improve across the area as fog continues to lift or burn off. The Dense Fog Advisory has been allowed to expire as a result. $$
The office that day
Everything else NWS Atlanta, GA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 18, 5:06 PM EST | Special Weather Statement | FFC | Stewart | 24 min |
| Dec 18, 5:31 PM EST | Special Weather Statement | FFC | Coweta, Heard, Troup | 29 min |
| Dec 18, 5:38 PM EST | Special Weather Statement | FFC | Stewart, Webster | 37 min |
| Dec 18, 6:34 PM EST | Special Weather Statement | FFC | Crawford, Taylor, Upson | 26 min |
Nearby
Dense Fog Advisories in Georgia, 2021Every 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.