Alert archive / Georgia / Flash Flood Warnings in 2003

Flash Flood Warning 10, NWS Charleston, SC

May 18, 2003Tattnall County, Georgia

NWS Charleston, SC issued this flash flood warning at May 18, 2003, 3:48 PM EDT for Tattnall County, Georgia. It was in force for 117 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: May 18, 2003, 3:48 PM EDT (19:48 UTC)
Expired: May 18, 2003, 5:45 PM EDT
In force: 117 min
Issued by: NWS Charleston, SC
Area: Counties, with a storm outline in the text

County Tattnall County, GA

The radar

The Charleston,SC radar (KCLX), 121 km from the middle of the area, began a volume at 19:52 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

Jacksonville, FL (KJAX), launched 12:00Z, 7.8 hours before the alert went out and 177 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: 2020 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 763 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WGUS52 KCHS 181949
FFWCHS
GAC267-182145-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
348 PM EDT SUN MAY 18 2003

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  TATTNALL COUNTY IN SOUTHEAST GEORGIA...

* UNTIL 545 PM EDT.

* AT 348 PM EDT...RADAR INDICATED VERY HEAVY RAIN OCCURRING WITH     
  THUNDERSTORMS ACROSS MANY PARTS OF THE COUNTY...WITH ADDITIONAL    
  VERY HEAVY RAINS EXPECTED TO MOVE IN FROM THE SOUTH DURING THE     
  REMAINDER OF THIS AFTERNOON. MOVEMENT OF THE RAIN WILL BE NORTH AT 
  10 MPH.

* FLASH FLOODING WILL OCCUR IN AND AROUND...
  GLENNVILLE...
  MENDES...
  MIDWAY...
  REIDSVILLE...
  COLLINS AND MANASSAS...

EXCESSIVE RUNOFF FROM THESE STORMS WILL CAUSE RAPID FLOODING OF
ROADWAYS...SMALL CREEKS AND STREAMS...LOW-LYING AREAS AND DITCHES.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY
FOR HIGHER GROUND. MOST FLOOD DEATHS OCCUR IN AUTOMOBILES.

LAT...LON 3194 8235 3181 8199 3203 8185 3207 8199
          3226 8204 3230 8223

$$

PM

The office that day

Everything else NWS Charleston, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 18, 3:35 PM EDT	Severe Thunderstorm Warning	CHS	Evans, Tattnall	40 min
May 18, 4:35 PM EDT	Severe Thunderstorm Warning	CHS	Liberty, Long	40 min
May 18, 5:45 PM EDT	Flash Flood Warning	CHS	Tattnall	3 hr

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.