Alert archive / Georgia / Flash Flood Warnings in 2016

Flash Flood Warning 11, NWS Atlanta, GA

August 24, 2016Clayton County, Fayette County, Fulton County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 24, 2016, 3:23 PM EDT for Clayton County, Fayette County, Fulton County, Georgia. It was in force for 6 hr. 1 report 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 24, 2016, 3:23 PM EDT (19:23 UTC)
Expired
Aug 24, 2016, 9:15 PM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

Counties Clayton County, GA, Fayette County, GA, Fulton County, GA

The radar

The Atlanta radar (KFFC), 32 km from the middle of the area, began a volume at 19:22 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 24, 3:45 PM EDTFLASH FLOOD1 Nw Hapeville, GAAREAS OF STREET FLOODING WERE REPORTED ON I-85 NORTH OF HARTSFIELD-JACKSON AIRPORT.

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

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 7.4 hours before the alert went out and 32 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 2016-08-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 137 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, Peachtre/Fal Fld, GA at 12:00Z on 2016-08-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -22 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
137 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
731 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-22 m²/s²
0-3 km storm-relative helicity
51 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

408 
WGUS52 KFFC 241923
FFWFFC
GAC063-113-121-250115-
/O.NEW.KFFC.FF.W.0011.160824T1923Z-160825T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
323 PM EDT WED AUG 24 2016

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN CLAYTON COUNTY IN NORTH CENTRAL GEORGIA...
  NORTHERN FAYETTE COUNTY IN NORTH CENTRAL GEORGIA...
  SOUTH CENTRAL FULTON COUNTY IN NORTH CENTRAL GEORGIA...

* UNTIL 915 PM EDT

* AT 322 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE
  ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  ATLANTA...DOUGLASVILLE...FAYETTEVILLE...JONESBORO...
  PEACHTREE CITY...EAST POINT...UNION CITY...FOREST PARK...
  RIVERDALE...COLLEGE PARK...FAIRBURN...TYRONE...MORROW...
  HAPEVILLE...PALMETTO...LAKE CITY...MIDTOWN...
  GRANT PARK-ZOO ATLANTA...
  HARTSFIELD-JACKSON AIRPORT AND TURNER FIELD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND
UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

IF YOU SEE SIGNIFICANT FLOODING CALL THE NATIONAL WEATHER SERVICE
TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6 OR TWEET US YOUR REPORT AT
NWSATLANTA.

&&

LAT...LON 3368 8464 3373 8460 3373 8459 3381 8449
      3383 8446 3384 8446 3384 8435 3345 8434
      3343 8461 3348 8462 3350 8461 3351 8463
      3360 8466

$$
2 follow-up statements
068 
WGUS72 KFFC 242028
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
428 PM EDT WED AUG 24 2016

GAC063-113-121-250115-
/O.CON.KFFC.FF.W.0011.000000T0000Z-160825T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLAYTON GA-FAYETTE GA-FULTON GA-
428 PM EDT WED AUG 24 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM EDT FOR
NORTHWESTERN CLAYTON...NORTHERN FAYETTE AND SOUTH CENTRAL FULTON
COUNTIES...

AT 428 PM EDT...HEAVY RAINFALL HAS TAPERED OFF ACROSS MUCH OF THE
WARNED AREA. HOWEVER...UP TO TWO INCHES OF RAIN HAVE ALREADY FALLEN.
LOCAL CREEKS AND STREAMS WILL CONTINUE TO BE AFFECTED...EVEN IN
AREAS WHERE HEAVY RAINFALL HAS TAPERED OFF. FLASH FLOODING OF SMALL
CREEKS AND STREAMS REMAINS POSSIBLE.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
ATLANTA...FAYETTEVILLE...JONESBORO...PEACHTREE CITY...EAST POINT...
UNION CITY...FOREST PARK...RIVERDALE...COLLEGE PARK...FAIRBURN...
TYRONE...MORROW...HAPEVILLE...PALMETTO...LAKE CITY...MIDTOWN...
GRANT PARK-ZOO ATLANTA...HARTSFIELD-JACKSON AIRPORT AND TURNER FIELD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU SEE SIGNIFICANT FLOODING CALL THE NATIONAL WEATHER SERVICE
TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6 OR TWEET US YOUR REPORT AT
NWSATLANTA.

&&

LAT...LON 3368 8464 3373 8460 3373 8459 3381 8449
      3383 8446 3384 8446 3384 8435 3345 8434
      3343 8461 3348 8462 3350 8461 3351 8463
      3360 8466

$$
086 
WGUS72 KFFC 242129
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
529 PM EDT WED AUG 24 2016

GAC063-113-121-242139-
/O.CAN.KFFC.FF.W.0011.000000T0000Z-160825T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLAYTON GA-FAYETTE GA-FULTON GA-
529 PM EDT WED AUG 24 2016

...THE FLASH FLOOD WARNING FOR NORTHWESTERN CLAYTON...NORTHERN
FAYETTE AND SOUTH CENTRAL FULTON COUNTIES IS CANCELLED...

THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 3368 8464 3373 8460 3373 8459 3381 8449
      3383 8446 3384 8446 3384 8435 3345 8434
      3343 8461 3348 8462 3350 8461 3351 8463
      3360 8466

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 24, 12:50 PM EDTSpecial Weather StatementFFCMadison40 min
Aug 24, 1:26 PM EDTSpecial Weather StatementFFCDeKalb64 min
Aug 24, 2:02 PM EDTFlash Flood WarningFFCClayton, DeKalb, Henry6 hr
Aug 24, 2:25 PM EDTSpecial Weather StatementFFCCobb, Fulton65 min
Aug 24, 3:50 PM EDTSpecial Weather StatementFFCFayette55 min
Aug 24, 3:53 PM EDTSpecial Weather StatementFFCDouglas67 min
Aug 24, 4:13 PM EDTFlash Flood WarningFFCCoweta, Fayette, Meriwether, Spalding6 hr
Aug 24, 4:26 PM EDTSpecial Weather StatementFFCCoweta64 min
Aug 24, 4:54 PM EDTSpecial Weather StatementFFCMeriwether66 min

Nearby

Flash Flood Warnings in Georgia, 2016Every flash flood warning in 2016

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.