Alert archive / Georgia / Flash Flood Warnings in 2004

Flash Flood Warning 9, NWS Charleston, SC

August 12, 2004Bryan County, Chatham County, Georgia

NWS Charleston, SC issued this flash flood warning at Aug 12, 2004, 7:41 PM EDT for Bryan County, Chatham County, 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
Aug 12, 2004, 7:41 PM EDT (23:41 UTC)
Expired
Aug 12, 2004, 9:15 PM EDT
In force
94 min
Issued by
NWS Charleston, SC
Area
Counties, with a storm outline in the text

Counties Bryan County, GA, Chatham County, GA

The radar

The Charleston,SC radar (KCLX), 70 km from the middle of the area, began a volume at 23:42 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

Charleston AFB, SC (KCHS), launched 12:00Z, 11.7 hours before the alert went out and 151 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-pSkew-T log-p diagram, Charleston AFB, SC at 12:00Z on 2004-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3311 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 12:00Z on 2004-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 117 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
3311 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
489 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
117 m²/s²
0-3 km storm-relative helicity
129 m²/s²
Significant tornado parameter
1.7
Supercell composite
10.5

Open this sounding in Storm Lab

The text

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

000 
WGUS52 KCHS 122342
FFWCHS
GAC029-051-130115-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
741 PM EDT THU AUG 12 2004

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BRYAN COUNTY IN SOUTHEAST GEORGIA...
  CHATHAM COUNTY IN SOUTHEAST GEORGIA...

* UNTIL 915 PM EDT

* AT 740 PM EDT...RADAR INDICATED VERY HEAVY RAIN MOVING INTO
  BRYAN AND CHATHAM COUNTY. WEATHER SERVICE RADAR ESTIMATED
  THAT 4 INCHES OF RAIN HAVE FALLEN ACROSS LIBERTY COUNTY IN
  THE LAST 2 HOURS. THE HEAVY RAIN WILL SPREAD TO THE NORTHEAST
  AND MAY OVERWHELM DRAINAGE SYSTEMS.

* FLASH FLOODING WILL OCCUR IN AND AROUND...
  GARDEN CITY...SAVANNAH...RICHMOND HILL AND PORT WENTWORTH...

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.

TO REPORT SIGNIFICANT FLOODING...PLEASE CONTACT THE NATIONAL WEATHER
SERVICE IN CHARLESTON TOLL FREE AT 1-888-383-2024.

LAT...LON 3203 8141 3189 8118 3209 8105 3219 8118

$$
1 follow-up statement
000 
WGUS72 KCHS 130114
FFSCHS
GAC029-051-130130-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
913 PM EDT THU AUG 12 2004

...THE FLASH FLOOD WARNING FOR BRYAN AND CHATHAM COUNTIES WILL  
EXPIRE AT 915 PM...

AT 913 PM RADAR INDICATED THAT THE AREA OF TORRENTIAL RAINFALL HAD
SHIFTED INTO PARTS OF JASPER AND BEAUFORT COUNTIES IN EXTREME 
SOUTHERN SOUTH CAROLINA. HEAVY RAIN LINGERS ALONG SOME OF THE BARRIER
ISLANDS OF CHATHAM COUNTY INCLUDING CHATHAM COUNTY. THIS RAIN SHOULD
TAPER OFF BEFORE 930 PM.

STAY TUNED TO NOAA WEATHER RADIO ALL HAZARDS OR THE LOCAL MEDIA FOR
ADDITIONAL SEVERE WEATHER INFORMATION. REPORT ANY FLOODING OR DAMAGE
CAUSED BY FLOODING TO LOCAL LAW ENFORCEMENT OFFICIALS AND ASK THEM TO
IMMEDIATELY RELAY THE REPORT TO THE NATIONAL WEATHER SERVICE IN
CHARLESTON.

TO REPORT SIGNIFICANT FLOODING...PLEASE CONTACT THE NATIONAL WEATHER
SERVICE IN CHARLESTON TOLL FREE AT 1-888-383-2024.

$$

24

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 6:21 PM EDTTornado WarningCHSLiberty, Long24 min
Aug 12, 6:42 PM EDTTornado WarningCHSLiberty, Long, McIntosh33 min
Aug 12, 7:16 PM EDTTornado WarningCHSLiberty, McIntosh29 min
Aug 12, 7:29 PM EDTFlash Flood WarningCHSCandler, Liberty, Tattnall26 days
Aug 12, 7:35 PM EDTSevere Thunderstorm WarningCHSBryan, Chatham, Liberty25 min
Aug 12, 7:59 PM EDTTornado WarningCHSBryan, Chatham31 min

Nearby

Flash Flood Warnings in Georgia, 2004Every flash flood warning in 2004

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.