Alert archive / Georgia / Flash Flood Warnings in 2003

Flash Flood Warning 113, NWS Atlanta, GA

July 13, 20035 counties in Georgia

NWS Atlanta, GA issued this flash flood warning at Jul 13, 2003, 9:41 PM EDT for 5 counties in Georgia. It was in force for 94 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 13, 2003, 9:41 PM EDT (01:41 UTC)
Expired: Jul 13, 2003, 11:15 PM EDT
In force: 94 min
Issued by: NWS Atlanta, GA
Area: Counties, with a storm outline in the text

Counties Barrow County, GA, Forsyth County, GA, Gwinnett County, GA, Hall County, GA, Jackson County, GA

The radar

The Atlanta radar (KFFC), 102 km from the middle of the area, began a volume at 01:41 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, 1.7 hours before the alert went out and 98 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: 323 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 1615 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
WGUS52 KFFC 140141
FFWATL
GAC013-117-135-139-157-140315-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
941 PM EDT SUN JUL 13 2003

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BARROW COUNTY IN NORTH CENTRAL GEORGIA
  SOUTHEASTERN FORSYTH COUNTY IN NORTH CENTRAL GEORGIA
  NORTHERN GWINNETT COUNTY IN NORTH CENTRAL GEORGIA
  SOUTHERN HALL COUNTY IN NORTH CENTRAL GEORGIA
  WESTERN JACKSON COUNTY IN NORTHEAST GEORGIA

* UNTIL 1115 PM EDT

* AT 936 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN 6 MILES NORTHWEST OF SUWANEE...OR ABOUT 6 MILES
  WEST OF SUGAR HILL...MOVING SOUTHEAST AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE ARCADE...AUBURN...BERKELEY
  LAKE...BUFORD...COMMERCE...CUMMING...DACULA...DULUTH...FLOWERY
  BRANCH...HOSCHTON...JEFFERSON...LAWRENCEVILLE...OAKWOOD...
  RUSSELL...STATHAM...SUGAR HILL AND WINDER

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY
IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS
BRIDGES...DIPS...OR OTHER LOW SPOTS IF WATER COVERS THE ROADWAY. TWO
FEET OF RUSHING WATER CAN CARRY AWAY MOST VEHICLES...INCLUDING SUVS
AND PICKUPS. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT.

LAT...LON 3425 8414 3395 8428 3390 8363 3423 8345

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 8:24 PM EDT	Severe Thunderstorm Warning	FFC	Hall	36 min
Jul 13, 9:03 PM EDT	Severe Thunderstorm Warning	FFC	Cherokee, Fulton	27 min
Jul 13, 9:08 PM EDT	Flash Flood Warning	FFC	Cherokee	67 min
Jul 13, 9:18 PM EDT	Flash Flood Warning	FFC	Greene, Taliaferro, Warren	87 min
Jul 13, 9:24 PM EDT	Severe Thunderstorm Warning	FFC	Forsyth	36 min
Jul 13, 9:37 PM EDT	Severe Thunderstorm Warning	FFC	Gwinnett	38 min
Jul 13, 10:47 PM EDT	Flash Flood Warning	FFC	Warren	118 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.