Alert archive / Georgia / Flash Flood Warnings in 2003

Flash Flood Warning 95, NWS Atlanta, GA

July 10, 2003Cobb County, Fulton County, Georgia

NWS Atlanta, GA issued this flash flood warning at Jul 10, 2003, 5:18 PM EDT for Cobb County, Fulton County, Georgia. It was in force for 87 min. 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 10, 2003, 5:18 PM EDT (21:18 UTC)
Expired: Jul 10, 2003, 6:45 PM EDT
In force: 87 min
Issued by: NWS Atlanta, GA
Area: Counties, with a storm outline in the text

Counties Cobb County, GA, Fulton County, GA

The radar

The Atlanta radar (KFFC), 56 km from the middle of the area, began a volume at 21:22 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, 9.3 hours before the alert went out and 55 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: 1832 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 694 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS52 KFFC 102121
FFWATL
GAC067-121-102245-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
518 PM EDT THU JUL 10 2003

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN COBB COUNTY IN NORTH CENTRAL GEORGIA
  CENTRAL FULTON COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 645 PM EDT

* AT 516 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
VERY HEAVY RAIN OF 1 TO 2 INCHES FROM POWDER SPRINGS TO NORTH 
ATLANTA.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. DO NOT DRIVE 
THROUGH FLOODED ROADWAYS.

LAT...LON 3389 8461 3374 8458 3383 8435 3396 8436

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 11:55 AM EDT	Severe Thunderstorm Warning	FFC	Oconee	35 min
Jul 10, 2:36 PM EDT	Flash Flood Warning	FFC	Dawson, Pickens	114 min
Jul 10, 4:29 PM EDT	Severe Thunderstorm Warning	FFC	Cobb, Fulton	31 min
Jul 10, 5:05 PM EDT	Severe Thunderstorm Warning	FFC	Fulton	25 min
Jul 10, 5:15 PM EDT	Severe Thunderstorm Warning	FFC	DeKalb	45 min
Jul 10, 5:38 PM EDT	Flash Flood Warning	FFC	DeKalb	97 min
Jul 10, 6:24 PM EDT	Severe Thunderstorm Warning	FFC	Carroll, Coweta, Douglas, Fulton	36 min

Nearby

Flash Flood Warnings in Georgia, 2003 Every flash flood warning in 2003

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.