Alert archive / Georgia / Flash Flood Watches in 2021
Flash Flood Watch 9, NWS Atlanta, GA
NWS Atlanta, GA issued this flash flood watch at Jul 20, 2021, 3:21 AM EDT for 45 counties in Georgia. It took effect at Jul 20, 2021, 4:00 AM EDT. It was in force for 18 hr.
The area
The counties it named.
The facts
- Issued
- Jul 20, 2021, 3:21 AM EDT (07:21 UTC)
- In effect from
- Jul 20, 2021, 4:00 AM EDT
- Expired
- Jul 20, 2021, 10:00 PM EDT
- In force
- 18 hr
- Issued by
- NWS Atlanta, GA
- Flood severity
- None
All 45 counties
Banks County, GA, Barrow County, GA, Bartow County, GA, Carroll County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Dade County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Fannin County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Gwinnett County, GA, Hall County, GA, Haralson County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Lumpkin County, GA, Madison County, GA, Morgan County, GA, Murray County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Rockdale County, GA, Towns County, GA, Union County, GA, Walker County, GA, Walton County, GA, White County, GA, Whitfield County, GA
The radar
The Atlanta radar (KFFC), 88 km from the middle of the area, began a volume at 07:25 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, 7.4 hours before the alert went out and 87 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
- 569 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 673 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
494 WGUS62 KFFC 200721 FFAFFC URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Peachtree City GA 321 AM EDT Tue Jul 20 2021 GAZ008-009-015-016-023>025-027-210000- /O.NEW.KFFC.FF.A.0009.210720T0800Z-210721T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Union-Towns-Lumpkin-White-Hall-Banks-Jackson-Madison- Including the cities of , Dahlonega, Gainesville, and Cleveland 321 AM EDT Tue Jul 20 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH THIS EVENING... The National Weather Service in Peachtree City has issued a * Flash Flood Watch for portions of north central Georgia and northeast Georgia, including the following areas, in north central Georgia, Hall, Lumpkin and Union. In northeast Georgia, Banks, Jackson, Madison, Towns and White. * Through this evening. * A stationary front draped across the area will brings periods of moderate to heavy rainfall across portions of northeast Georgia through this evening. New rainfall amounts of 1 to 2 are possible, with locally higher amounts. This area has recently received between 1 to 2 inches of rain with locally higher amounts of 2.5+ inches. With already saturated soils, quickly accumulating rainfall will easily allow for efficient runoff and increase flash flood potential. * Creeks and streams may rise out of their banks and inundate fields, roads, businesses and other property. Street flooding could also lead to road closures. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
4 follow-up statements
944 WGUS62 KFFC 201402 FFAFFC URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Peachtree City GA 1002 AM EDT Tue Jul 20 2021 GAZ001>007-011>014-019>022-030>035-037-038-041>049-052>055-057- 202215- /O.EXB.KFFC.FF.A.0009.000000T0000Z-210721T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Dade-Walker-Catoosa-Whitfield-Murray-Fannin-Gilmer-Chattooga-Gordon- Pickens-Dawson-Floyd-Bartow-Cherokee-Forsyth-Polk-Paulding-Cobb- North Fulton-Gwinnett-Barrow-Oconee-Oglethorpe-Haralson-Carroll- Douglas-South Fulton-DeKalb-Rockdale-Walton-Newton-Morgan-Heard- Coweta-Fayette-Clayton-Henry- Including the cities of , Lawrenceville, Cartersville, Newnan, Calhoun, East Point, Conyers, Rome, Marietta, Carrollton, Covington, Atlanta, Douglasville, Decatur, and Peachtree City 1002 AM EDT Tue Jul 20 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH 10 PM THIS EVENING... The National Weather Service in Peachtree City has expanded the * Flash Flood Watch for much of north and west-central Georgia, including the following counties, Barrow, Cherokee, Clayton, Cobb, Dawson, DeKalb, Douglas, Fannin, Fayette, Forsyth, Gilmer, Gwinnett, Henry, Morgan, Newton, Fulton, Pickens, Rockdale, Walton, Oconee, Oglethorpe, Bartow, Carroll, Catoosa, Chattooga, Dade, Floyd, Gordon, Haralson, Murray, Paulding, Polk, Walker and Whitfield, Coweta and Heard. * Until 10 PM EDT this evening. * A stationary front draped across the area will brings periods of moderate to locally heavy rainfall through this evening. New rainfall amounts of 1 to 2 are possible, with locally higher amounts. This area has recently received between 1.5 to 4 inches of rain, with locally higher amounts of up to 5 inches, since Monday morning. With already saturated soils, quickly accumulating rainfall could easily allow for efficient runoff and an increase in flash flood potential, especially along creeks, streams, low-lying and poor drainage areas. * Fast-responding creeks and streams may rise out of their banks and inundate fields, roads, businesses and other property. Street flooding from persistent heavy rain could quickly lead to problems, especially in urban areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ GAZ008-009-015-016-023>025-027-202215- /O.EXT.KFFC.FF.A.0009.000000T0000Z-210721T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Union-Towns-Lumpkin-White-Hall-Banks-Jackson-Madison- Including the cities of , Dahlonega, Gainesville, and Cleveland 1002 AM EDT Tue Jul 20 2021 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH 10 PM THIS EVENING... The Flash Flood Watch is now in effect for * Portions of north central and northeast Georgia, including the following counties, Hall, Lumpkin, Union, Banks, Jackson, Madison, Towns and White. * Until 10 PM EDT this evening. * A stationary front draped across the area will brings periods of moderate to locally heavy rainfall through this evening. New rainfall amounts of 1 to 2 are possible, with locally higher amounts. This area has recently received between 1.5 to 4 inches of rain, with locally higher amounts of up to 5 inches, since Monday morning. With already saturated soils, quickly accumulating rainfall could easily allow for efficient runoff and an increase in flash flood potential, especially along creeks, streams, low-lying and poor drainage areas. * Fast-responding creeks and streams may rise out of their banks and inundate fields, roads, businesses and other property. Street flooding from persistent heavy rain could quickly lead to problems, especially in urban areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. If you encounter running water over roadways, find an alternate route and remember to turn around don't drown! && $$ DJN
217 WGUS62 KFFC 201409 FFAFFC URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Peachtree City GA 1009 AM EDT Tue Jul 20 2021 GAZ036-202215- /O.EXA.KFFC.FF.A.0009.000000T0000Z-210721T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Clarke- Including the cities of Athens 1009 AM EDT Tue Jul 20 2021 ...FLASH FLOOD WATCH IN EFFECT UNTIL 10 PM EDT THIS EVENING... The National Weather Service in Peachtree City has expanded the * Flash Flood Watch to include Clarke County. * Until 10 PM EDT this evening. * A stationary front draped across the area will brings periods of moderate to locally heavy rainfall through this evening. New rainfall amounts of 1 to 2 are possible, with locally higher amounts. This area has recently received between 1 and 3 inches of rain, since Monday morning. With already saturated soils, quickly accumulating rainfall could easily allow for efficient runoff and an increase in flash flood potential, especially along creeks, streams, low-lying and poor drainage areas. * Fast-responding creeks and streams may rise out of their banks and inundate fields, roads, businesses and other property. Street flooding from persistent heavy rain could quickly lead to problems, especially in urban areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. If you encounter running water over roadways, find an alternate route and remember to turn around don't drown! && $$ GAZ001>009-011>016-019>025-027-030>035-037-038-041>049-052>055-057- 202215- /O.CON.KFFC.FF.A.0009.000000T0000Z-210721T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Dade-Walker-Catoosa-Whitfield-Murray-Fannin-Gilmer-Union-Towns- Chattooga-Gordon-Pickens-Dawson-Lumpkin-White-Floyd-Bartow-Cherokee- Forsyth-Hall-Banks-Jackson-Madison-Polk-Paulding-Cobb-North Fulton- Gwinnett-Barrow-Oconee-Oglethorpe-Haralson-Carroll-Douglas-South Fulton-DeKalb-Rockdale-Walton-Newton-Morgan-Heard-Coweta-Fayette- Clayton-Henry- Including the cities of , Conyers, Lawrenceville, Decatur, Dahlonega, Newnan, Gainesville, Calhoun, East Point, Marietta, Covington, Rome, Carrollton, Cleveland, Atlanta, Douglasville, Cartersville, and Peachtree City 1009 AM EDT Tue Jul 20 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 PM EDT THIS EVENING... The Flash Flood Watch continues for * Much of north and west central Georgia. * Until 10 PM EDT this evening. * A stationary front draped across the area will brings periods of moderate to locally heavy rainfall through this evening. New rainfall amounts of 1 to 2 are possible, with locally higher amounts. This area has recently received between 1.5 to 4 inches of rain, with locally higher amounts of up to 5 inches, since Monday morning. With already saturated soils, quickly accumulating rainfall could easily allow for efficient runoff and an increase in flash flood potential, especially along creeks, streams, low-lying and poor drainage areas. * Fast-responding creeks and streams may rise out of their banks and inundate fields, roads, businesses and other property. Street flooding from persistent heavy rain could quickly lead to problems, especially in urban areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. If you encounter running water over roadways, find an alternate route and remember to turn around don't drown! && $$ DJN
660 WGUS62 KFFC 201823 FFAFFC Flood Watch National Weather Service Peachtree City GA 223 PM EDT Tue Jul 20 2021 GAZ001>009-011>016-019>025-027-030>038-041>049-052>055-057-210200- /O.CON.KFFC.FF.A.0009.000000T0000Z-210721T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Dade-Walker-Catoosa-Whitfield-Murray-Fannin-Gilmer-Union-Towns- Chattooga-Gordon-Pickens-Dawson-Lumpkin-White-Floyd-Bartow-Cherokee- Forsyth-Hall-Banks-Jackson-Madison-Polk-Paulding-Cobb-North Fulton- Gwinnett-Barrow-Clarke-Oconee-Oglethorpe-Haralson-Carroll-Douglas- South Fulton-DeKalb-Rockdale-Walton-Newton-Morgan-Heard-Coweta- Fayette-Clayton-Henry- Including the cities of , East Point, Conyers, Lawrenceville, Decatur, Dahlonega, Newnan, Gainesville, Calhoun, Athens, Marietta, Covington, Rome, Carrollton, Cleveland, Atlanta, Douglasville, Cartersville, and Peachtree City 223 PM EDT Tue Jul 20 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 PM EDT THIS EVENING... The Flash Flood Watch continues for * Much of north and west-central Georgia. * Until 10 PM EDT this evening. * A stationary front draped across the area will brings periods of moderate to locally heavy rainfall through this evening. New rainfall amounts of 1 to 2 are possible, with locally higher amounts. This area has recently received between 1.5 to 4 inches of rain, with locally higher amounts of up to 5 inches, since Monday morning. With already saturated soils, quickly accumulating rainfall could easily allow for efficient runoff and an increase in flash flood potential, especially along creeks, streams, low-lying and poor drainage areas. * Fast-responding creeks and streams may rise out of their banks and inundate fields, roads, businesses and other property. Street flooding from persistent heavy rain could quickly lead to problems, especially in urban areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. If you encounter running water over roadways, find an alternate route and remember to turn around don't drown! && $$ DJN
295 WGUS62 KFFC 210211 FFAFFC Flood Watch National Weather Service Peachtree City GA 1011 PM EDT Tue Jul 20 2021 GAZ001>009-011>016-019>025-027-030>038-041>049-052>055-057-210315- /O.EXP.KFFC.FF.A.0009.000000T0000Z-210721T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Dade-Walker-Catoosa-Whitfield-Murray-Fannin-Gilmer-Union-Towns- Chattooga-Gordon-Pickens-Dawson-Lumpkin-White-Floyd-Bartow-Cherokee- Forsyth-Hall-Banks-Jackson-Madison-Polk-Paulding-Cobb-North Fulton- Gwinnett-Barrow-Clarke-Oconee-Oglethorpe-Haralson-Carroll-Douglas- South Fulton-DeKalb-Rockdale-Walton-Newton-Morgan-Heard-Coweta- Fayette-Clayton-Henry- Including the cities of , East Point, Conyers, Lawrenceville, Decatur, Dahlonega, Newnan, Gainesville, Calhoun, Athens, Marietta, Covington, Rome, Carrollton, Cleveland, Atlanta, Douglasville, Cartersville, and Peachtree City 1011 PM EDT Tue Jul 20 2021 ...FLASH FLOOD WATCH HAS EXPIRED... The Flash Flood Watch for portions of north central Georgia, northeast Georgia, northwest Georgia and west central Georgia, including the following areas, in north central Georgia, Barrow, Cherokee, Clayton, Cobb, Dawson, DeKalb, Douglas, Fannin, Fayette, Forsyth, Gilmer, Gwinnett, Hall, Henry, Lumpkin, Morgan, Newton, North Fulton, Pickens, Rockdale, South Fulton, Union and Walton. In northeast Georgia, Banks, Clarke, Jackson, Madison, Oconee, Oglethorpe, Towns and White. In northwest Georgia, Bartow, Carroll, Catoosa, Chattooga, Dade, Floyd, Gordon, Haralson, Murray, Paulding, Polk, Walker and Whitfield. In west central Georgia, Coweta and Heard has expired. The Flash Flood Watch is cancelled. Flooding is no longer expected to pose a threat across the majority of the area. A couple Flash Flood Warnings remain across western Georgia. Although the rain has ended, there may still be some residual instances of flooding. Please continue to heed remaining road closures. $$
The office that day
Everything else NWS Atlanta, GA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 9:37 PM EDT | Special Weather Statement | FFC | Coweta | 53 min |
| Jul 19, 10:07 PM EDT | Flash Flood Warning | FFC | Coweta, Heard, Troup | 6 hr |
| Jul 19, 10:13 PM EDT | Flash Flood Warning | FFC | Clayton, DeKalb, Fulton | 6 hr |
| Jul 19, 10:22 PM EDT | River Flood Warning | FFC | DeKalb | 4 hr |
| Jul 19, 10:31 PM EDT | River Flood Warning | FFC | DeKalb | 2 hr |
| Jul 19, 11:09 PM EDT | River Flood Warning | FFC | DeKalb | 98 min |
| Jul 20, 1:45 PM EDT | Special Weather Statement | FFC | Hancock | 30 min |
| Jul 20, 3:54 PM EDT | Special Weather Statement | FFC | Newton | 36 min |
| Jul 20, 4:22 PM EDT | Special Weather Statement | FFC | Morgan | 23 min |
| Jul 20, 5:01 PM EDT | Special Weather Statement | FFC | Wilkes | 44 min |
| Jul 20, 5:40 PM EDT | Special Weather Statement | FFC | Meriwether, Troup | 35 min |
| Jul 20, 5:55 PM EDT | Special Weather Statement | FFC | Bibb | 35 min |
| Jul 20, 7:17 PM EDT | Flash Flood Warning | FFC | Carroll, Haralson | 6 hr |
| Jul 20, 7:41 PM EDT | Special Weather Statement | FFC | Lamar, Pike | 49 min |
| Jul 20, 7:57 PM EDT | Special Weather Statement | FFC | Johnson | 48 min |
Nearby
Flash Flood Watches in Georgia, 2021Every flash flood watch 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.