Alert archive / Georgia / Flash Flood Warnings in 2020

Flash Flood Warning 55, NWS Atlanta, GA

September 17, 20207 counties in Georgia

NWS Atlanta, GA issued this flash flood warning at Sep 17, 2020, 2:49 AM EDT for 7 counties in Georgia. It was in force for 7 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Sep 17, 2020, 2:49 AM EDT (06:49 UTC)
Expired: Sep 17, 2020, 9:45 AM EDT
In force: 7 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

Counties Butts County, GA, Clayton County, GA, Coweta County, GA, Fayette County, GA, Fulton County, GA, Henry County, GA, Spalding County, GA

The radar

The Atlanta radar (KFFC), 20 km from the middle of the area, began a volume at 06:53 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.

What was reported inside it

Time	Report	Where	Remark
Sep 17, 9:00 AM EDT	FLASH FLOOD	1 Se Lovejoy, GA	GA HWY 81 CLOSED FOR FLOODING AT STEELE DRIVE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 6.8 hours before the alert went out and 16 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 540 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 263 m²/s²
0-3 km storm-relative helicity: 345 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

796 
WGUS52 KFFC 170649
FFWFFC
GAC035-063-077-113-121-151-255-171245-
/O.NEW.KFFC.FF.W.0055.200917T0649Z-200917T1245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
249 AM EDT Thu Sep 17 2020

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Butts County in central Georgia...
  Clayton County in north central Georgia...
  Fayette County in north central Georgia...
  Southwestern Fulton County in north central Georgia...
  Henry County in north central Georgia...
  Coweta County in west central Georgia...
  Spalding County in west central Georgia...

* Until 845 AM EDT.

* At 249 AM EDT, Doppler radar indicated heavy rain in the warned 
  area. Between 1.5 and 3 inches of rain have fallen. Flash flooding 
  is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by heavy rain.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Atlanta, Newnan, Griffin, McDonough, Fayetteville, Jackson, 
  Jonesboro, Peachtree City, East Point, Stockbridge, Union City, 
  Forest Park, Riverdale, College Park, Fairburn, Hampton, Tyrone, 
  Morrow, Lovejoy and Hapeville.

Additional rainfall amounts of 2 to 3 inches are possible in the 
warned area.

LAT...LON 3343 8501 3345 8497 3344 8494 3352 8482
      3360 8480 3366 8466 3377 8454 3377 8435
      3365 8435 3365 8425 3363 8424 3365 8418
      3356 8413 3344 8392 3333 8384 3325 8381
      3321 8383 3319 8381 3322 8494

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...2-3 INCHES IN 6 HOURS 

$$

3 follow-up statements

669 
WGUS52 KFFC 171022
FFWFFC
GAC035-063-113-121-151-255-171345-
/O.EXT.KFFC.FF.W.0055.000000T0000Z-200917T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
622 AM EDT Thu Sep 17 2020

The National Weather Service in Peachtree City has extended the

* Flash Flood Warning for...
  Butts County in central Georgia...
  Clayton County in north central Georgia...
  Fayette County in north central Georgia...
  Southwestern Fulton County in north central Georgia...
  Henry County in north central Georgia...
  Spalding County in west central Georgia...

* Until 945 AM EDT.

* At 622 AM EDT, Doppler radar indicated heavy rain in the warned 
  area. Between 2 and 5 inches of rain have fallen. Flash flooding 
  is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by heavy rain.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Atlanta, Griffin, McDonough, Fayetteville, Jackson, Jonesboro, 
  Peachtree City, East Point, Stockbridge, Union City, Forest Park, 
  Riverdale, College Park, Fairburn, Hampton, Tyrone, Morrow, 
  Lovejoy, Hapeville and Locust Grove.

Additional rainfall amounts up to 1 inch are possible in the warned 
area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Please report flooding to your local law enforcement agency when you 
can do so safely.

&&

LAT...LON 3350 8461 3352 8482 3359 8480 3366 8466
      3377 8454 3377 8435 3365 8435 3365 8425
      3363 8424 3365 8418 3356 8413 3344 8392
      3333 8384 3325 8381 3321 8383 3319 8381
      3322 8450 3332 8452 3340 8461

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1 INCH IN 3 HOURS 

$$

668 
WGUS72 KFFC 171022
FFSFFC

Flash Flood Statement
National Weather Service Peachtree City GA
622 AM EDT Thu Sep 17 2020

GAC077-171032-
/O.CAN.KFFC.FF.W.0055.000000T0000Z-200917T1245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coweta GA-
622 AM EDT Thu Sep 17 2020

...FLASH FLOOD WARNING IS CANCELLED FOR COWETA COUNTY...

Flash flooding is no longer expected to pose a threat. Please 
continue to heed remaining road closures. Keep in mind that rivers 
and creeks may continue to rise due to the high runoff rates from 
overnight rainfall.

LAT...LON 3350 8461 3352 8482 3359 8480 3366 8466
      3377 8454 3377 8435 3365 8435 3365 8425
      3363 8424 3365 8418 3356 8413 3344 8392
      3333 8384 3325 8381 3321 8383 3319 8381
      3322 8450 3332 8452 3340 8461

$$

037 
WGUS72 KFFC 171344 RRB
FFSFFC

Flash Flood Statement
National Weather Service Peachtree City GA
944 AM EDT Thu Sep 17 2020

GAC035-063-113-121-151-255-171354-
/O.EXP.KFFC.FF.W.0055.000000T0000Z-200917T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Butts GA-Clayton GA-Fayette GA-Fulton GA-Henry GA-Spalding GA-
944 AM EDT Thu Sep 17 2020

...FLASH FLOOD WARNING WILL EXPIRE AT 945 AM EDT THIS MORNING FOR 
BUTTS, CLAYTON, FAYETTE, SOUTHWESTERN FULTON, HENRY AND SPALDING 
COUNTIES...

The heavy rain has ended. Flooding is beginning to recede and is no 
longer expected to pose an additional threat. Please continue to 
heed remaining road closures.

A Flash Flood Watch remains in effect until 800 AM EDT Friday for 
portions of central Georgia...east central Georgia...north central 
Georgia...northeast Georgia...northwest Georgia and west central 
Georgia.

LAT...LON 3350 8461 3352 8482 3359 8480 3366 8466
      3377 8454 3377 8435 3365 8435 3365 8425
      3363 8424 3365 8418 3356 8413 3344 8392
      3333 8384 3325 8381 3321 8383 3319 8381
      3322 8450 3332 8452 3340 8461

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 16, 9:10 PM EDT	Flash Flood Warning	FFC	Chattahoochee, Marion, Muscogee, Schley, Stewart, Sumter and 1 more	6 hr
Sep 16, 11:25 PM EDT	Flash Flood Warning	FFC	Crisp, Dooly, Macon, Taylor	7 hr
Sep 17, 12:00 AM EDT	Flash Flood Warning	FFC	Bibb, Bleckley, Crawford, Houston, Peach, Pulaski and 2 more	11 hr
Sep 17, 12:45 AM EDT	Flash Flood Warning	FFC	Harris, Lamar, Monroe, Pike, Talbot, Upson	7 hr
Sep 17, 1:13 AM EDT	Flash Flood Warning	FFC	Meriwether, Troup	5 hr
Sep 17, 2:59 AM EDT	Flash Flood Warning	FFC	Baldwin, Jones, Wilkinson	8 hr
Sep 17, 3:29 AM EDT	Flash Flood Warning	FFC	Chattahoochee, Marion, Muscogee, Schley, Stewart, Sumter and 1 more	3 hr
Sep 17, 3:34 AM EDT	Flash Flood Warning	FFC	DeKalb, Gwinnett, Newton, Rockdale	6 hr
Sep 17, 3:39 AM EDT	Flash Flood Warning	FFC	Cobb, Douglas, Fulton	6 hr
Sep 17, 4:29 AM EDT	River Flood Warning	FFC	DeKalb, Fulton	8 hr
Sep 17, 4:32 AM EDT	River Flood Warning	FFC	DeKalb	11 hr
Sep 17, 4:32 AM EDT	River Flood Warning	FFC	DeKalb, Fulton	10 hr
Sep 17, 4:35 AM EDT	River Flood Warning	FFC	DeKalb	6 hr
Sep 17, 4:42 AM EDT	River Flood Warning	FFC	Fulton, Gwinnett	7 hr
Sep 17, 4:45 AM EDT	River Flood Warning	FFC	Fayette, Spalding	55 hr
Sep 17, 4:45 AM EDT	River Flood Warning	FFC	Crawford, Talbot, Taylor, Upson	28 hr
Sep 17, 4:45 AM EDT	River Flood Warning	FFC	Clayton, Fayette, Spalding	32 hr
Sep 17, 4:50 AM EDT	River Flood Warning	FFC	Chattahoochee, Muscogee	17 hr
Sep 17, 5:04 AM EDT	River Flood Warning	FFC	Lamar, Spalding	9 hr
Sep 17, 5:07 AM EDT	River Flood Warning	FFC	DeKalb, Rockdale	38 hr
Sep 17, 5:07 AM EDT	River Flood Warning	FFC	Forsyth, Fulton	43 hr
Sep 17, 5:07 AM EDT	River Flood Warning	FFC	Gwinnett	25 hr
Sep 17, 5:07 AM EDT	River Flood Warning	FFC	Newton, Rockdale	47 hr
Sep 17, 5:13 AM EDT	Flash Flood Warning	FFC	Hancock, Jasper, Putnam, Washington	6 hr
Sep 17, 5:16 AM EDT	River Flood Warning	FFC	Pulaski	6 hr
Sep 17, 5:16 AM EDT	River Flood Warning	FFC	Bibb, Houston, Jones, Monroe, Twiggs	4 days
Sep 17, 5:36 AM EDT	River Flood Warning	FFC	Gwinnett	5 hr
Sep 17, 5:39 AM EDT	River Flood Warning	FFC	Barrow, Jackson	34 hr
Sep 17, 5:39 AM EDT	River Flood Warning	FFC	Johnson, Washington, Wilkinson	5 days
Sep 17, 5:39 AM EDT	River Flood Warning	FFC	Baldwin, Washington, Wilkinson	39 hr
Sep 17, 5:39 AM EDT	River Flood Warning	FFC	Clarke, Greene, Oconee	64 hr
Sep 17, 5:43 AM EDT	River Flood Warning	FFC	DeKalb, Fulton	10 hr
Sep 17, 6:00 AM EDT	River Flood Warning	FFC	DeKalb	4 hr
Sep 17, 6:42 AM EDT	Flash Flood Warning	FFC	Glascock, Jefferson, Warren	6 hr
Sep 17, 6:44 AM EDT	River Flood Warning	FFC	Cobb	4 hr
Sep 17, 6:51 AM EDT	River Flood Warning	FFC	Gwinnett, Walton	12 hr
Sep 17, 6:54 AM EDT	River Flood Warning	FFC	Gwinnett	11 hr
Sep 17, 6:58 AM EDT	River Flood Warning	FFC	Cobb	7 hr
Sep 17, 7:09 AM EDT	River Flood Warning	FFC	Forsyth	16 hr
Sep 17, 7:18 AM EDT	River Flood Warning	FFC	DeKalb, Fulton	118 min
Sep 17, 7:22 AM EDT	River Flood Warning	FFC	Cobb	7 hr
Sep 17, 7:27 AM EDT	River Flood Warning	FFC	Gwinnett	8 hr
Sep 17, 7:31 AM EDT	River Flood Warning	FFC	Fulton	12 hr
Sep 17, 7:47 AM EDT	Flash Flood Warning	FFC	Greene, Taliaferro	5 hr
Sep 17, 9:23 AM EDT	River Flood Warning	FFC	Cherokee, Cobb	5 hr
Sep 17, 9:28 AM EDT	River Flood Warning	FFC	Cobb, Fulton	16 hr
Sep 17, 10:31 AM EDT	River Flood Warning	FFC	Cobb, Fulton	13 hr
Sep 17, 10:31 AM EDT	River Flood Warning	FFC	Cobb, Fulton	11 hr
Sep 17, 10:31 AM EDT	River Flood Warning	FFC	Carroll, Coweta, Heard	12 hr
Sep 17, 11:03 AM EDT	River Flood Warning	FFC	Jefferson, Washington	23 hr
Sep 17, 11:23 AM EDT	River Flood Warning	FFC	Jones	15 hr
Sep 17, 1:31 PM EDT	River Flood Warning	FFC	Johnson, Laurens, Washington, Wilkinson	44 hr
Sep 17, 2:25 PM EDT	River Flood Warning	FFC	Newton, Rockdale	6 hr
Sep 17, 2:40 PM EDT	River Flood Warning	FFC	Taliaferro, Wilkes	33 hr
Sep 17, 2:44 PM EDT	River Flood Warning	FFC	Jefferson	3 hr
Sep 17, 3:32 PM EDT	River Flood Warning	FFC	Coweta, Fayette, Spalding	11 hr
Sep 17, 6:42 PM EDT	River Flood Warning	FFC	Elbert, Madison, Oglethorpe	3 hr
Sep 17, 7:22 PM EDT	River Flood Warning	FFC	Dooly	4 hr

Nearby

Flash Flood Warnings in Georgia, 2020 Every flash flood warning in 2020

Sources

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