Alert archive / Georgia / Flash Flood Warnings in 2018

Flash Flood Warning 25, NWS Atlanta, GA

July 14, 2018Coweta County, Meriwether County, Georgia

NWS Atlanta, GA issued this flash flood warning at Jul 14, 2018, 8:14 PM EDT for Coweta 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: Jul 14, 2018, 8:14 PM EDT (00:14 UTC)
Expired: Jul 14, 2018, 11:29 PM EDT
In force: 3 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

Counties Coweta County, GA, Meriwether County, GA

The radar

The Atlanta radar (KFFC), 17 km from the middle of the area, began a volume at 00:15 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

Birmingham, AL (KBMX), launched 00:00Z, 0.2 hours before the alert went out and 198 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: 538 J/kg
Mixed-layer CIN: -153 J/kg
Mixed-layer LCL: 1116 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: -17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

318 
WGUS52 KFFC 150014
FFWFFC
GAC077-199-150615-
/O.NEW.KFFC.FF.W.0025.180715T0014Z-180715T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
814 PM EDT SAT JUL 14 2018

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Northern Meriwether County in west central Georgia...
  Southeastern Coweta County in west central Georgia...

* Until 215 AM EDT Sunday.

* At 814 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Flash flooding is expected to
  begin shortly.

* Some locations that will experience flooding include...
  Grantville, Luthersville, Haralson, Lone Oak, Alvaton and Rocky
  Mount.

LAT...LON 3327 8452 3317 8452 3316 8485 3327 8486

$$

1 follow-up statement

124 
WGUS72 KFFC 150329
FFSFFC

Flash Flood Statement
National Weather Service Peachtree City GA
1129 PM EDT SAT JUL 14 2018

GAC077-199-150338-
/O.CAN.KFFC.FF.W.0025.000000T0000Z-180715T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Meriwether GA-Coweta GA-
1129 PM EDT SAT JUL 14 2018

...THE FLASH FLOOD WARNING FOR NORTHERN MERIWETHER AND SOUTHEASTERN
COWETA COUNTIES IS CANCELLED...

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

LAT...LON 3327 8452 3317 8452 3316 8485 3327 8486

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 8:00 PM EDT	Special Weather Statement	FFC	Bibb, Bleckley, Dodge	30 min
Jul 14, 8:28 PM EDT	Special Weather Statement	FFC	Meriwether	32 min
Jul 14, 8:31 PM EDT	Special Weather Statement	FFC	Bibb, Bleckley, Laurens, Twiggs	29 min
Jul 14, 8:58 PM EDT	Special Weather Statement	FFC	Bibb, Twiggs	32 min
Jul 14, 9:28 PM EDT	Special Weather Statement	FFC	Twiggs	32 min
Jul 15, 2:56 PM EDT	Special Weather Statement	FFC	Dade	49 min
Jul 15, 3:00 PM EDT	Special Weather Statement	FFC	Wilcox	45 min
Jul 15, 4:40 PM EDT	Special Weather Statement	FFC	Wheeler	35 min
Jul 15, 5:11 PM EDT	Special Weather Statement	FFC	Wheeler	34 min
Jul 15, 5:38 PM EDT	Special Weather Statement	FFC	Bleckley	37 min
Jul 15, 5:44 PM EDT	Special Weather Statement	FFC	Laurens	31 min
Jul 15, 5:46 PM EDT	Special Weather Statement	FFC	Jeff Davis	29 min
Jul 15, 5:50 PM EDT	Special Weather Statement	FFC	Dooly	25 min
Jul 15, 6:13 PM EDT	Special Weather Statement	FFC	Bleckley	32 min
Jul 15, 6:15 PM EDT	Special Weather Statement	FFC	Dooly	30 min
Jul 15, 6:26 PM EDT	Special Weather Statement	FFC	Chattahoochee	34 min
Jul 15, 6:48 PM EDT	Special Weather Statement	FFC	Houston	27 min
Jul 15, 6:53 PM EDT	Special Weather Statement	FFC	Marion	37 min
Jul 15, 6:58 PM EDT	Special Weather Statement	FFC	Montgomery	32 min
Jul 15, 7:06 PM EDT	Special Weather Statement	FFC	Chattahoochee	24 min
Jul 15, 7:15 PM EDT	Special Weather Statement	FFC	Peach	30 min
Jul 15, 7:29 PM EDT	Special Weather Statement	FFC	Marion	31 min
Jul 15, 7:43 PM EDT	Special Weather Statement	FFC	Crawford, Peach	32 min
Jul 15, 7:57 PM EDT	Special Weather Statement	FFC	Chattahoochee	33 min

Nearby

Flash Flood Warnings in Georgia, 2018 Every flash flood warning in 2018

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.