Alert archive / Georgia / Flash Flood Warnings in 2021

Flash Flood Warning 13, NWS Atlanta, GA

July 19, 2021Coweta County, Heard County, Troup County, Georgia

NWS Atlanta, GA issued this flash flood warning at Jul 19, 2021, 10:07 PM EDT for Coweta County, Heard County, Troup County, Georgia. It was in force for 6 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: Jul 19, 2021, 10:07 PM EDT (02:07 UTC)
Expired: Jul 20, 2021, 4:15 AM EDT
In force: 6 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

Counties Coweta County, GA, Heard County, GA, Troup County, GA

The radar

The Atlanta radar (KFFC), 25 km from the middle of the area, began a volume at 02:06 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, 2.1 hours before the alert went out and 31 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: 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

Open this sounding in Storm Lab

The text

As transmitted.

238 
WGUS52 KFFC 200207
FFWFFC
GAC077-149-285-200815-
/O.NEW.KFFC.FF.W.0013.210720T0207Z-210720T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
1007 PM EDT Mon Jul 19 2021

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Coweta County in west central Georgia...
  Eastern Heard County in west central Georgia...
  Northeastern Troup County in west central Georgia...

* Until 415 AM EDT Tuesday.

* At 1007 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Newnan, Palmetto, Grantville, Moreland, Sharpsburg, East Newnan, 
  Corinth, Arnco-Sargent, Madras, Dunaway Gardens, Plant Yates, 
  Handy, Roscoe, Powers Crossroads, Thomas Crossroads and Cannongate.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3335 8505 3345 8492 3347 8491 3349 8486
      3351 8485 3351 8462 3350 8461 3348 8463
      3332 8465 3322 8477 3322 8485 3320 8488
      3319 8503

FLASH FLOOD...RADAR INDICATED

$$

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, 10:13 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, 3:21 AM EDT	Flash Flood Watch	FFC	Banks, Barrow, Bartow, Carroll, Catoosa, Chattooga and 39 more	19 hr
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 Warnings in Georgia, 2021 Every flash flood warning 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.