Alert archive / Georgia / Flash Flood Warnings in 2016

Flash Flood Warning 12, NWS Atlanta, GA

August 24, 20164 counties in Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 24, 2016, 4:13 PM EDT for 4 counties in Georgia. It was in force for 6 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 24, 2016, 4:13 PM EDT (20:13 UTC)
Expired
Aug 24, 2016, 10:15 PM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

Counties Coweta County, GA, Fayette County, GA, Meriwether County, GA, Spalding County, GA

The radar

The Atlanta radar (KFFC), 11 km from the middle of the area, began a volume at 20:15 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, 8.2 hours before the alert went out and 9 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.

998 
WGUS52 KFFC 242013
FFWFFC
GAC077-113-199-255-250215-
/O.NEW.KFFC.FF.W.0012.160824T2013Z-160825T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN MERIWETHER COUNTY IN WEST CENTRAL GEORGIA...
  SOUTHWESTERN SPALDING COUNTY IN WEST CENTRAL GEORGIA...
  SOUTHERN FAYETTE COUNTY IN NORTH CENTRAL GEORGIA...
  SOUTHEASTERN COWETA COUNTY IN WEST CENTRAL GEORGIA...

* UNTIL 1015 PM EDT WEDNESDAY

* AT 413 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...
  FAYETTEVILLE...PEACHTREE CITY...SENOIA...BROOKS...HARALSON...
  WOOLSEY...DIGBEY...INMAN...STARRS MILL AND LAKE HORTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

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 3343 8460 3345 8439 3344 8440 3342 8440
      3341 8439 3321 8442 3321 8445 3320 8446
      3320 8447 3319 8448 3319 8450 3317 8451
      3317 8457 3323 8464

$$
1 follow-up statement
645 
WGUS72 KFFC 242354
FFSFFC

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

GAC077-113-199-255-250004-
/O.CAN.KFFC.FF.W.0012.000000T0000Z-160825T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MERIWETHER GA-SPALDING GA-FAYETTE GA-COWETA GA-
754 PM EDT WED AUG 24 2016

...THE FLASH FLOOD WARNING FOR NORTHEASTERN MERIWETHER...SOUTHWESTERN
SPALDING...SOUTHERN FAYETTE AND SOUTHEASTERN COWETA 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 3343 8460 3345 8439 3344 8440 3342 8440
      3341 8439 3321 8442 3321 8445 3320 8446
      3320 8447 3319 8448 3319 8450 3317 8451
      3317 8457 3323 8464

$$

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, 3:23 PM EDTFlash Flood WarningFFCClayton, Fayette, Fulton6 hr
Aug 24, 3:50 PM EDTSpecial Weather StatementFFCFayette55 min
Aug 24, 3:53 PM EDTSpecial Weather StatementFFCDouglas67 min
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.