Alert archive / Georgia / Flash Flood Warnings in 2012

Flash Flood Warning 11, NWS Columbia, SC

August 11, 2012Columbia County, Richmond County, Georgia

NWS Columbia, SC issued this flash flood warning at Aug 11, 2012, 10:21 AM EDT for Columbia County, Richmond County, Georgia. It was in force for 84 min. 5 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 11, 2012, 10:21 AM EDT (14:21 UTC)
Expired
Aug 11, 2012, 11:45 AM EDT
In force
84 min
Issued by
NWS Columbia, SC
Area
Storm-based polygon
Flood severity
None

Counties Columbia County, GA, Richmond County, GA

The radar

The Columbia radar (KCAE), 103 km from the middle of the area, began a volume at 14:23 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.

What was reported inside it

TimeReportWhereRemark
Aug 11, 11:00 AM EDTFLASH FLOOD3 W Grovetown, GALAW ENFORCEMENT REPORT OF FLASH FLOOD HARLEM-GROVETOWN ROAD NEAR LOUISVILLE ROAD.
Aug 11, 11:00 AM EDTFLASH FLOOD4 Sw Evans, GALAW ENFORCEMENT REPORT OF FLOODING AT JOHN DEERE PARKWAY AND HORIZON SOUTH.
Aug 11, 11:15 AM EDTFLASH FLOOD1 Ene Augusta, GALAW ENFORCEMENT REPORT OF FLASH FLOODING AT 1000 LANEY WALKER BLVD.
Aug 11, 11:15 AM EDTFLASH FLOOD3 E Augusta, GALAW ENFORCEMENT REPORT OF FLASH FLOODING AT 225 MAGNOLIA AVENUE IN AUGUSTA.
Aug 11, 11:15 AM EDTFLASH FLOOD3 E Augusta, GALAW ENFORCEMENT REPORT OF FLASH FLOODING EAST HALL STREET IN AUGUSTA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 2.4 hours before the alert went out and 200 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 2012-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 678 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, Charleston AFB, SC at 12:00Z on 2012-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 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
678 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
894 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
48 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

010 
WGUS52 KCAE 111421
FFWCAE
GAC073-245-111545-
/O.NEW.KCAE.FF.W.0011.120811T1421Z-120811T1545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE COLUMBIA SC
1021 AM EDT SAT AUG 11 2012

THE NATIONAL WEATHER SERVICE IN COLUMBIA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN COLUMBIA COUNTY IN EAST CENTRAL GEORGIA...
  THIS INCLUDES THE CITIES OF...MARTINEZ...GROVETOWN...EVANS...
  RICHMOND COUNTY IN EAST CENTRAL GEORGIA...
  THIS INCLUDES THE CITIES OF...FORT GORDON...AUGUSTA...

* UNTIL 1145 AM EDT

* AT 1015 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HARLEM

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 2 INCHES ARE POSSIBLE IN THE WARNED 
AREA.

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. MOVE TO HIGHER GROUND.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY 
DEEPER THAN THEY APPEAR. TURN AROUND...DONT DROWN.

REPORT FLOODING TO YOUR COUNTY SHERIFF...OR CALL THE NATIONAL WEATHER
SERVICE...TOLL FREE 1 877 6 3 3...6 7 7 2.

&&

LAT...LON 3361 8215 3359 8214 3360 8210 3356 8204
      3349 8199 3346 8193 3344 8191 3342 8193
      3341 8191 3341 8195 3337 8193 3336 8195
      3333 8190 3328 8215 3330 8218 3327 8224
      3349 8239

$$

TTH

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 11, 10:03 AM EDTAreal Flood AdvisoryCAEColumbia, McDuffie, Richmond117 min
Aug 11, 3:27 PM EDTSpecial Weather StatementCAEBurke, Columbia, McDuffie, Richmond63 min
Aug 11, 4:07 PM EDTAreal Flood AdvisoryCAEColumbia, Richmond113 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.