Alert archive / Georgia / Flash Flood Warnings in 2008

Flash Flood Warning 11, NWS Atlanta, GA

August 26, 2008Cobb County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 26, 2008, 9:21 AM EDT for Cobb County, Georgia. It was in force for 4 hr. 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 26, 2008, 9:21 AM EDT (13:21 UTC)
Expired
Aug 26, 2008, 1:25 PM EDT
In force
4 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

County Cobb County, GA

The radar

The Atlanta radar (KFFC), 69 km from the middle of the area, began a volume at 13:24 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 1.4 hours before the alert went out and 69 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, Peachtre/Fal Fld, GA at 12:00Z on 2008-08-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 825 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, Peachtre/Fal Fld, GA at 12:00Z on 2008-08-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 348 square meters per square second.19395878Sfc1 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
825 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
459 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
348 m²/s²
0-3 km storm-relative helicity
373 m²/s²
Significant tornado parameter
1.3
Supercell composite
13.3

Open this sounding in Storm Lab

The text

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

000 
WGUS52 KFFC 261321
FFWFFC
GAC067-261915-
/O.NEW.KFFC.FF.W.0011.080826T1321Z-080826T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
921 AM EDT TUE AUG 26 2008

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN COBB COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 315 PM EDT

* AT 910 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  1.5 TO 2 INCHES OF RAIN HAS FALLEN OVER WESTERN COBB COUNTY SINCE  
  3 AM EDT. FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO POWDER
  SPRINGS...MARIETTA...KENNESAW...FAIR OAKS...AUSTELL AND ACWORTH.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...AS WELL AS HIGHWAYS AND UNDERPASSES.
ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF
CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING.

HIGH WATERS ARE MOVING DOWN ALLATOONA CREEK NEAR MARS HILL.
THE STAGE HEIGHT WAS 11.7 FEET AND RISING. FLOOD STAGE IS 13 FEET. 
THE CREEK SHOULD CREST BETWEEN 13 AND 14 FEET AROUND NOON.

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 3408 8472 3408 8454 3381 8455 3383 8472

$$

16
4 follow-up statements
000 
WGUS72 KFFC 261359
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
959 AM EDT TUE AUG 26 2008

GAC067-261915-
/O.CON.KFFC.FF.W.0011.000000T0000Z-080826T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COBB GA-
959 AM EDT TUE AUG 26 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 PM EDT FOR
WESTERN COBB COUNTY...

AT 952 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
LIGHT TO MODERATE RAIN OVER THE WARNED AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO KENNESAW AND 
ACWORTH.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE OVER 
THE WARNED AREA THROUGH 315 PM EDT.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...AS WELL AS HIGHWAYS AND UNDERPASSES.
ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF
CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING.

HIGH WATERS ARE MOVING DOWN ALLATOONA CREEK NEAR MARS HILL. THE 
STAGE HEIGHT WAS 12.1 FEET AND RISING AT 915 AM EDT. FLOOD STAGE IS 
13 FEET. THE CREEK SHOULD CREST BETWEEN 13 AND 14 FEET AROUND NOON.

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 3408 8472 3408 8454 3381 8455 3383 8472

$$

16
000 
WGUS72 KFFC 261612
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1212 PM EDT TUE AUG 26 2008

GAC067-261915-
/O.CON.KFFC.FF.W.0011.000000T0000Z-080826T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COBB GA-
1212 PM EDT TUE AUG 26 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 PM EDT FOR
WESTERN COBB COUNTY...

AT 1202 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
LIGHT TO MODERATE RAIN MOVING NORTHEAST AT 30 MPH OUT OF THE WARNED 
AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO KENNESAW AND 
ACWORTH.

ADDITIONAL RAINFALL AMOUNTS ARE POSSIBLE WITH DEVELOPING SCATTERED 
SHOWERS IN EAST CENTRAL ALABAMA THROUGH 315 PM EDT.

EXCESSIVE RUNOFF FROM PREVIOUS HEAVY RAINFALL MAY BE CAUSING  
FLOODING OF SMALL CREEKS AND STREAMS...AS WELL AS HIGHWAYS AND 
UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE 
BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO 
FLOODING.

HIGH WATER CONTINUES ON ALLATOONA CREEK AT STILESBORO ROAD NEAR MARS 
HILL AND ACWORTH. THE STAGE HEIGHT WAS 9.2 FEET AND FALLING AT 1115 
AM EDT. FLOOD STAGE IS 13 FEET. THE CREEK CRESTED AROUND 12.5 FEET 
AT 945 AM EDT.

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 3408 8472 3408 8454 3381 8455 3383 8472

$$

16
000 
WGUS72 KFFC 261714
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
114 PM EDT TUE AUG 26 2008

GAC067-261713-
/O.CAN.KFFC.FF.W.0011.000000T0000Z-080826T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COBB GA-
114 PM EDT TUE AUG 26 2008

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WESTERN COBB
COUNTY...

THE RAIN MOVED OUT OF THE WARNED AREA AROUND 1230 PM EDT. THERE
WILL BE A 1 TO 2 HOUR BREAK BEFORE SCATTERED SHOWERS AND POSSIBLE
THUNDERSTORMS MOVE BACK INTO WESTERN COBB COUNTY THIS AFTERNOON.

ALLATOONA CREEK AT STILESBORO ROAD NEAR MARS HILL AND ACWORTH 
CRESTED AROUND 12.5 FEET AT 945 AM EDT THIS MORNING. FLOOD STAGE IS 
13 FEET. THE STAGE HEIGHT WAS 8.2 FEET AND FALLING AT 1215 PM EDT. 

A COBB COUNTY EMA OFFICIAL INDICATED NO ADDITIONAL FLOODING WAS 
OCCURRING.

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 3408 8472 3408 8454 3381 8455 3383 8472

$$

16
000 
WGUS72 KFFC 261725 CCA
FFSFFC

FLASH FLOOD STATEMENT...CORRECTION TO EXPIRATION TIME
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
125 PM EDT TUE AUG 26 2008

GAC067-261745-
/O.CAN.KFFC.FF.W.0011.000000T0000Z-080826T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COBB GA-
125 PM EDT TUE AUG 26 2008

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WESTERN COBB
COUNTY...

THE RAIN MOVED OUT OF THE WARNED AREA AROUND 1230 PM EDT. THERE
WILL BE A 1 TO 2 HOUR BREAK BEFORE SCATTERED SHOWERS AND POSSIBLE
THUNDERSTORMS MOVE BACK INTO WESTERN COBB COUNTY THIS AFTERNOON.

ALLATOONA CREEK AT STILESBORO ROAD NEAR MARS HILL AND ACWORTH 
CRESTED AROUND 12.5 FEET AT 945 AM EDT THIS MORNING. FLOOD STAGE IS 
13 FEET. THE STAGE HEIGHT WAS 8.2 FEET AND FALLING AT 1215 PM EDT. 

A COBB COUNTY EMA OFFICIAL INDICATED NO ADDITIONAL FLOODING WAS 
OCCURRING.

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 3408 8472 3408 8454 3381 8455 3383 8472

$$

16

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 25, 10:45 PM EDTTornado WarningFFCOglethorpe, Wilkes30 min
Aug 25, 11:08 PM EDTTornado WarningFFCWilkes52 min
Aug 25, 11:56 PM EDTTornado WarningFFCBibb, Houston, Twiggs49 min
Aug 26, 12:01 AM EDTTornado WarningFFCBarrow, Gwinnett, Oconee, Walton44 min
Aug 26, 8:09 AM EDTTornado WarningFFCCobb, DeKalb, Fulton36 min
Aug 26, 9:31 AM EDTTornado WarningFFCTalbot, Taylor, Upson44 min
Aug 26, 9:59 AM EDTTornado WarningFFCLamar22 min
Aug 26, 11:34 AM EDTTornado WarningFFCCrawford, Monroe41 min
Aug 26, 12:04 PM EDTTornado WarningFFCJasper, Jones41 min
Aug 26, 12:28 PM EDTTornado WarningFFCCrisp47 min
Aug 26, 12:40 PM EDTFlash Flood WarningFFCLumpkin, White6 hr
Aug 26, 12:40 PM EDTTornado WarningFFCJasper, Morgan, Putnam50 min
Aug 26, 1:16 PM EDTTornado WarningFFCOconee, Walton29 min
Aug 26, 1:30 PM EDTSevere Thunderstorm WarningFFCClarke, Jackson, Madison30 min
Aug 26, 1:39 PM EDTFlash Flood WarningFFCTowns6 hr
Aug 26, 2:01 PM EDTTornado WarningFFCClarke, Oconee, Oglethorpe29 min
Aug 26, 2:07 PM EDTFlash Flood WarningFFCBanks, Jackson6 hr
Aug 26, 3:16 PM EDTFlash Flood WarningFFCNewton, Rockdale6 hr
Aug 26, 3:28 PM EDTRiver Flood WarningFFCForsyth, Fulton6 hr
Aug 26, 3:49 PM EDTTornado WarningFFCHall, White41 min
Aug 26, 4:08 PM EDTTornado WarningFFCBarrow, Jackson37 min
Aug 26, 4:10 PM EDTTornado WarningFFCDooly, Houston, Macon, Peach50 min
Aug 26, 4:36 PM EDTTornado WarningFFCBanks, Jackson24 min
Aug 26, 4:55 PM EDTTornado WarningFFCGreene, Oglethorpe50 min
Aug 26, 6:02 PM EDTTornado WarningFFCGreene, Oglethorpe, Taliaferro, Wilkes58 min
Aug 26, 6:08 PM EDTTornado WarningFFCBanks, Hall37 min
Aug 26, 6:24 PM EDTTornado WarningFFCBaldwin, Jones38 min
Aug 26, 6:41 PM EDTFlash Flood WarningFFCLumpkin, White6 hr
Aug 26, 7:00 PM EDTTornado WarningFFCWilkes15 min
Aug 26, 7:15 PM EDTAreal Flood WarningFFCHall6 hr
Aug 26, 7:31 PM EDTTornado WarningFFCHancock, Taliaferro, Warren44 min

Nearby

Flash Flood Warnings in Georgia, 2008Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.