Alert archive / Georgia / Flash Flood Warnings in 2012

Flash Flood Warning 8, NWS Charleston, SC

August 28, 20124 counties in Georgia

NWS Charleston, SC issued this flash flood warning at Aug 28, 2012, 7:35 PM EDT for 4 counties in Georgia. It was in force for 60 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 28, 2012, 7:35 PM EDT (23:35 UTC)
Expired
Aug 28, 2012, 8:35 PM EDT
In force
60 min
Issued by
NWS Charleston, SC
Area
Storm-based polygon
Flood severity
None

Counties Evans County, GA, Liberty County, GA, Long County, GA, Tattnall County, GA

The radar

The Charleston,SC radar (KCLX), 126 km from the middle of the area, began a volume at 23:38 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, 11.6 hours before the alert went out and 158 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, Jacksonville, FL at 12:00Z on 2012-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1236 joules per kilogram.LCLLFCEL10008507005003002001001 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, Jacksonville, FL at 12:00Z on 2012-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -89 square meters per square second.1939Sfc1 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
1236 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
514 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-89 m²/s²
0-3 km storm-relative helicity
-59 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.

841 
WGUS52 KCHS 282335
FFWCHS
GAC109-179-183-267-290130-
/O.NEW.KCHS.FF.W.0008.120828T2335Z-120829T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
735 PM EDT TUE AUG 28 2012

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN EVANS COUNTY IN SOUTHEAST GEORGIA...
  NORTHWESTERN LIBERTY COUNTY IN SOUTHEAST GEORGIA...
  NORTHWESTERN LONG COUNTY IN SOUTHEAST GEORGIA...
  TATTNALL COUNTY IN SOUTHEAST GEORGIA...

* UNTIL 930 PM EDT

* AT 729 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  NUMEROUS SHOWERS AND THUNDERSTORMS EXTENDING FROM MIDWAY AND   
  GLENNVILLE SOUTHWEST TO NEAR BAXLEY. AS MUCH AS 3 INCHES OF RAIN   
  HAS ALREADY FALLEN IN SOME AREAS SINCE 630 PM AND AN ADDITIONAL 2 
  TO 3 INCHES COULD FALL THROUGH 930 PM...RESULTING IN FLASH   
  FLOODING.

* FLASH FLOODING IS EXPECTED IN AND AROUND...
  GLENNVILLE...MENDES...MIDWAY...REIDSVILLE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AVOID DRIVING INTO WATER ON THE ROAD. THE WATER IS USUALLY DEEPER
THAN IT APPEARS AND THE ROAD MAY BE WASHED OUT. ONLY ONE FOOT OF
WATER WILL STALL A VEHICLE AND LESS THAN TWO FEET OF WATER CAN FLOAT
AND CARRY AWAY A VEHICLE. FLOODING IS THE NUMBER ONE WEATHER-RELATED
CAUSE OF DEATH IN THE UNITED STATES. WHEN ENCOUNTERING FLOODED ROADS
MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

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

&&

LAT...LON 3204 8221 3217 8203 3200 8171 3175 8191
      3175 8193 3178 8196 3178 8198 3181 8202
      3184 8208 3186 8212 3188 8212 3191 8223

$$
1 follow-up statement
971 
WGUS72 KCHS 290035
FFSCHS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
835 PM EDT TUE AUG 28 2012

GAC109-179-183-267-290045-
/O.CAN.KCHS.FF.W.0008.000000T0000Z-120829T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TATTNALL GA-EVANS GA-LIBERTY GA-LONG GA-
835 PM EDT TUE AUG 28 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHWESTERN
LONG...NORTHWESTERN LIBERTY...SOUTHWESTERN EVANS AND TATTNALL
COUNTIES...

ALTHOUGH THE RISK FOR SIGNIFICANT FLOODING HAS ENDED...DRAINAGE 
SYSTEMS AND CULVERTS WILL REMAIN FULL. PONDING WATER WILL PERSIST IN 
LOW-LYING AREAS AND MAY POSE A HAZARD TO MOTORISTS. STAY TUNED TO 
NOAA WEATHER RADIO ALL-HAZARDS FOR THE LATEST WEATHER INFORMATION.

LAT...LON 3204 8221 3217 8203 3200 8171 3175 8191
      3175 8193 3178 8196 3178 8198 3181 8202
      3184 8208 3186 8212 3188 8212 3191 8223

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 28, 3:53 PM EDTAreal Flood AdvisoryCHSEffingham2 hr
Aug 28, 4:26 PM EDTSpecial Weather StatementCHSBulloch64 min
Aug 28, 4:51 PM EDTSpecial Weather StatementCHSEffingham39 min
Aug 28, 4:56 PM EDTSevere Thunderstorm WarningCHSEffingham64 min
Aug 28, 5:42 PM EDTSpecial Weather StatementCHSEvans48 min
Aug 28, 6:18 PM EDTSpecial Weather StatementCHSLiberty, Long, McIntosh57 min
Aug 28, 6:35 PM EDTAreal Flood AdvisoryCHSEvans, Tattnall115 min
Aug 28, 6:43 PM EDTSpecial Weather StatementCHSTattnall47 min

Nearby

Flash Flood Warnings in Georgia, 2012Every flash flood warning in 2012

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.