Alert archive / Georgia / Flash Flood Warnings in 2008

Flash Flood Warning 8, NWS Atlanta, GA

July 11, 2008Emanuel County, Georgia

NWS Atlanta, GA issued this flash flood warning at Jul 11, 2008, 9:34 PM EDT for Emanuel County, Georgia. It was in force for 4 hr. 2 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: Jul 11, 2008, 9:34 PM EDT (01:34 UTC)
Expired: Jul 12, 2008, 1:30 AM EDT
In force: 4 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

County Emanuel County, GA

The radar

The Robins AFB radar (KJGX), 108 km from the middle of the area, began a volume at 01:37 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

Time	Report	Where	Remark
Jul 11, 9:45 PM EDT	FLASH FLOOD	1 Ne Swainsboro, GA	CANOOCHEE ROAD CLOSED DUE TO 12 INCHES OF FAST MOVING WATER OVER ROAD.
Jul 11, 9:55 PM EDT	FLASH FLOOD	3 N Swainsboro, GA	HIGHWAY 56 NEAR OLD WADLEY RD CLOSED DUE TO 8 INCHES OF WATER FLOWING OVER ROAD.

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 00:00Z, 1.6 hours before the alert went out and 209 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: 677 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 965 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 54 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 KFFC 120137
FFWFFC
GAC107-120530-
/O.NEW.KFFC.FF.W.0008.080712T0134Z-080712T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
934 PM EDT FRI JUL 11 2008

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EMANUEL COUNTY IN EAST CENTRAL GEORGIA

* UNTIL 130 AM EDT

* AT 930 PM EDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED WATER FLOWING
  OVER LAMBS BRIDGE ROAD ABOUT 3 MILES SOUTHEAST OF SWAINSBORO. RADAR 
  INDICATED VERY HEAVY RAIN AND THUNDERSTORMS ALONG A BAND FROM 5 MILES
  NORTH OF SWAINSBORO TO NEAR GEORGE L SMITH STATE PARK...MOVING 
  SOUTHEAST AT 10 MPH.  RADAR HAS INDICATED 3 TO 4 INCHES OF RAIN HAVE
  FALLEN SINCE 800 PM. AN ADDITIONAL 1 TO 2 INCHES OF RAIN IS POSSIBLE
  IN THESE AREAS THROUGH 1100 PM.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  STILLMORE.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS...STREAMS AND COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

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

IF YOU SEE SIGNIFICANT FLOODING CALL THE NATIONAL WEATHER SERVICE
TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6.

LAT...LON 3252 8213 3249 8216 3247 8218 3243 8218
      3241 8219 3273 8243 3284 8231 3282 8226
      3266 8218 3255 8209

$$

1 follow-up statement

000 
WGUS72 KFFC 120336
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1132 PM EDT FRI JUL 11 2008

GAC107-120530-
/O.CON.KFFC.FF.W.0008.000000T0000Z-080712T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
EMANUEL GA-
1132 PM EDT FRI JUL 11 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 AM EDT FOR
EMANUEL COUNTY...

AT 1129 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
LIGHT RAIN TAPERING OFF IN EASTERN EMANUEL COUNTY. ALTHOUGH THE RAIN 
IS ENDING...RUNOFF FROM THE VERY HEAVY RAIN EARLIER THIS EVENING 
WILL CAUSE CREEKS AND STREAMS TO CONTINUE TO RISE THROUGH 130 AM. 

EMANUEL COUNTY OFFICIALS REPORT THAT SEVERAL ROADS HAVE BEEN CLOSED 
DUE TO FAST MOVING WATER 8 TO 12 INCHES OVER THE ROADS EAST AND 
NORTH OF SWAINSBORO. HIGHWAY 56 NEAR OLD WADLEY ROAD IS 
CLOSED...CANOOCHEE ROAD IS CLOSED 1 MILE NORTHEAST OF SWAINSBORO... 
AND LAMBS BRIDGE ROAD ON THE CANOOCHEE CREEK BRIDGE IS CLOSED. 

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS...STREAMS AND COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. 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.

IF YOU SEE SIGNIFICANT FLOODING PLEASE CALL THE NATIONAL WEATHER 
SERVICE TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6.

LAT...LON 3252 8213 3249 8216 3247 8218 3243 8218
      3241 8219 3273 8243 3284 8231 3282 8226
      3266 8218 3255 8209

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 2:30 PM EDT	Severe Thunderstorm Warning	FFC	Haralson	29 min

Nearby

Flash Flood Warnings in Georgia, 2008 Every flash flood warning in 2008

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.