Alert archive / Georgia / Flash Flood Warnings in 2020

Flash Flood Warning 43, NWS Atlanta, GA

August 25, 2020Coweta County, Fayette County, Meriwether County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 25, 2020, 9:26 AM EDT for Coweta County, Fayette County, Meriwether County, Georgia. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 25, 2020, 9:26 AM EDT (13:26 UTC)
Expired: Aug 25, 2020, 12:34 PM EDT
In force: 3 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

Counties Coweta County, GA, Fayette County, GA, Meriwether County, GA

The radar

The Atlanta radar (KFFC), 11 km from the middle of the area, began a volume at 13:24 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 12:00Z, 1.4 hours before the alert went out and 15 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: 41 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 813 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 223 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

053 
WGUS52 KFFC 251326
FFWFFC
GAC077-113-199-251930-
/O.NEW.KFFC.FF.W.0043.200825T1326Z-200825T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
926 AM EDT Tue Aug 25 2020

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Southwestern Fayette County in north central Georgia...
  Southeastern Coweta County in west central Georgia...
  North Central Meriwether County in west central Georgia...

* Until 330 PM EDT Tuesday.

* At 926 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 2.5 inches of 
  rain have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  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...
  Fayetteville, Peachtree City, Tyrone, Senoia, Luthersville, 
  Sharpsburg, Turin, Haralson, Starrs Mill and Rocky Mount.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3326 8472 3337 8465 3345 8458 3346 8454
      3346 8452 3343 8450 3337 8450 3335 8449
      3325 8454 3316 8464 3312 8466 3311 8469
      3312 8473 3314 8475 3318 8476

FLASH FLOOD...RADAR INDICATED

$$

1 follow-up statement

267 
WGUS72 KFFC 251634
FFSFFC

Flash Flood Statement
National Weather Service Peachtree City GA
1234 PM EDT Tue Aug 25 2020

GAC077-113-199-251644-
/O.CAN.KFFC.FF.W.0043.000000T0000Z-200825T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coweta GA-Fayette GA-Meriwether GA-
1234 PM EDT Tue Aug 25 2020

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN FAYETTE, 
SOUTHEASTERN COWETA AND NORTH CENTRAL MERIWETHER COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3326 8472 3337 8465 3345 8458 3346 8454
      3346 8452 3343 8450 3337 8450 3335 8449
      3325 8454 3316 8464 3312 8466 3311 8469
      3312 8473 3314 8475 3318 8476

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 8:07 PM EDT	Special Weather Statement	FFC	Pulaski	23 min
Aug 24, 8:35 PM EDT	Special Weather Statement	FFC	Pulaski	25 min
Aug 24, 8:49 PM EDT	Special Weather Statement	FFC	Telfair, Wheeler	26 min
Aug 24, 9:03 PM EDT	Special Weather Statement	FFC	Pulaski	27 min
Aug 24, 9:17 PM EDT	Special Weather Statement	FFC	Wheeler	28 min
Aug 24, 9:21 PM EDT	Special Weather Statement	FFC	Treutlen	24 min
Aug 24, 9:41 PM EDT	Special Weather Statement	FFC	Telfair	34 min
Aug 24, 9:51 PM EDT	Special Weather Statement	FFC	Treutlen	24 min
Aug 24, 9:53 PM EDT	Special Weather Statement	FFC	Toombs	37 min
Aug 24, 10:33 PM EDT	Special Weather Statement	FFC	Toombs	27 min
Aug 24, 11:02 PM EDT	Special Weather Statement	FFC	Montgomery, Toombs	28 min
Aug 24, 11:29 PM EDT	Special Weather Statement	FFC	Emanuel, Montgomery, Toombs	31 min
Aug 24, 11:57 PM EDT	Special Weather Statement	FFC	Emanuel	33 min
Aug 25, 12:29 AM EDT	Special Weather Statement	FFC	Emanuel	31 min
Aug 25, 2:43 AM EDT	Special Weather Statement	FFC	Montgomery, Wheeler	32 min
Aug 25, 3:21 AM EDT	Special Weather Statement	FFC	Montgomery, Treutlen, Wheeler	24 min
Aug 25, 8:39 AM EDT	Flash Flood Warning	FFC	Pike, Spalding	6 hr
Aug 25, 10:07 AM EDT	Flash Flood Warning	FFC	DeKalb, Henry, Rockdale, Spalding	4 hr
Aug 25, 10:56 AM EDT	Special Weather Statement	FFC	Barrow, Gwinnett	64 min
Aug 25, 12:10 PM EDT	River Flood Warning	FFC	Spalding	3 hr
Aug 25, 12:59 PM EDT	Special Weather Statement	FFC	Haralson	31 min
Aug 25, 1:41 PM EDT	Special Weather Statement	FFC	Paulding	34 min
Aug 25, 2:23 PM EDT	Flash Flood Warning	FFC	Haralson, Polk	2 hr
Aug 25, 6:22 PM EDT	Special Weather Statement	FFC	Toombs	23 min
Aug 25, 6:27 PM EDT	Severe Thunderstorm Warning	FFC	Toombs	48 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.