Alert archive / Georgia / Flash Flood Warnings in 2016

Flash Flood Warning 10, NWS Atlanta, GA

August 24, 2016Clayton County, DeKalb County, Henry County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 24, 2016, 2:02 PM EDT for Clayton County, DeKalb County, Henry County, 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, 2:02 PM EDT (18:02 UTC)
Expired
Aug 24, 2016, 8:00 PM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

Counties Clayton County, GA, DeKalb County, GA, Henry County, GA

The radar

The Atlanta radar (KFFC), 50 km from the middle of the area, began a volume at 18:04 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, 6.0 hours before the alert went out and 46 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.

641 
WGUS52 KFFC 241802
FFWFFC
GAC063-089-151-250000-
/O.NEW.KFFC.FF.W.0010.160824T1802Z-160825T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN CLAYTON COUNTY IN NORTH CENTRAL GEORGIA...
  NORTH CENTRAL HENRY COUNTY IN NORTH CENTRAL GEORGIA...
  DEKALB COUNTY IN NORTH CENTRAL GEORGIA...

* UNTIL 800 PM EDT

* AT 201 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...DECATUR...FOREST PARK...CLARKSTON...MORROW...
  STONE MOUNTAIN...AVONDALE ESTATES...LAKE CITY...LITHONIA...
  PINE LAKE...DRUID HILLS...NORTH DECATUR...CANDLER-MCAFEE...
  BELVEDERE PARK...NORTH DRUID HILLS...TUCKER...SNAPFINGER...
  ARABIA MOUNTAIN...BELMONT AND GRESHAM PARK.

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 3384 8423 3383 8414 3375 8406 3362 8412
      3364 8415 3364 8418 3363 8418 3359 8415
      3358 8414 3357 8414 3359 8434 3380 8435

$$
2 follow-up statements
409 
WGUS72 KFFC 242022
FFSFFC

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

GAC063-089-151-250000-
/O.CON.KFFC.FF.W.0010.000000T0000Z-160825T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLAYTON GA-HENRY GA-DEKALB GA-
422 PM EDT WED AUG 24 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 PM EDT FOR
NORTHEASTERN CLAYTON...NORTH CENTRAL HENRY AND DEKALB COUNTIES...

AT 417 PM EDT...RAIN HAD TAPERED OFF ACROSS THE WARNED AREA.
HOWEVER...RUNOFF FROM EARLIER HEAVY RAINFALL WILL CONTINUE TO AFFECT
LOCAL CREEKS AND STREAMS. FLASH FLOODING OF SMALL CREEKS AND STREAMS
REMAINS POSSIBLE.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
ATLANTA...DECATUR...FOREST PARK...CLARKSTON...MORROW...
STONE MOUNTAIN...AVONDALE ESTATES...LAKE CITY...LITHONIA...
PINE LAKE...DRUID HILLS...NORTH DECATUR...CANDLER-MCAFEE...
BELVEDERE PARK...NORTH DRUID HILLS...TUCKER...SNAPFINGER...
ARABIA MOUNTAIN...BELMONT AND GRESHAM PARK.

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 3384 8423 3383 8414 3375 8406 3362 8412
      3364 8415 3364 8418 3363 8418 3359 8415
      3358 8414 3357 8414 3359 8434 3380 8435

$$
860 
WGUS72 KFFC 242058
FFSFFC

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

GAC063-089-151-242108-
/O.CAN.KFFC.FF.W.0010.000000T0000Z-160825T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLAYTON GA-HENRY GA-DEKALB GA-
458 PM EDT WED AUG 24 2016

...THE FLASH FLOOD WARNING FOR NORTHEASTERN CLAYTON...NORTH CENTRAL
HENRY AND DEKALB 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 3384 8423 3383 8414 3375 8406 3362 8412
      3364 8415 3364 8418 3363 8418 3359 8415
      3358 8414 3357 8414 3359 8434 3380 8435

$$

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, 2:25 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, 4:13 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.