Alert archive / Georgia / Flash Flood Warnings in 2014

Flash Flood Warning 36, NWS Atlanta, GA

September 12, 2014DeKalb County, Fulton County, Gwinnett County, Georgia

NWS Atlanta, GA issued this flash flood warning at Sep 12, 2014, 8:09 AM EDT for DeKalb County, Fulton County, Gwinnett 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
Sep 12, 2014, 8:09 AM EDT (12:09 UTC)
Expired
Sep 12, 2014, 2:00 PM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

Counties DeKalb County, GA, Fulton County, GA, Gwinnett County, GA

The radar

The Atlanta radar (KFFC), 67 km from the middle of the area, began a volume at 12:11 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
Sep 12, 8:15 AM EDTFLASH FLOODArrowind, GAMINOR FLOODING WITH WATER OVER THE ROADWAY WAS REPORTED AT HWY 29 AND INLAND WAY.

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, 0.2 hours before the alert went out and 63 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 2014-09-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 603 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°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 2014-09-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 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
603 J/kg
Mixed-layer CIN
-36 J/kg
Mixed-layer LCL
870 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
0 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.

184 
WGUS52 KFFC 121209
FFWFFC
GAC089-121-135-121800-
/O.NEW.KFFC.FF.W.0036.140912T1209Z-140912T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
809 AM EDT FRI SEP 12 2014

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN DEKALB COUNTY IN NORTH CENTRAL GEORGIA
  EAST CENTRAL FULTON COUNTY IN NORTH CENTRAL GEORGIA
  GWINNETT COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 200 PM EDT

* AT 800 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. ALTHOUGH  
  THE RAIN IS DECREASING ACROSS THE AREA...ONE TO TWO INCHES OF      
  RAINFALL IN ONE TO TWO HOURS COMBINED WITH THE WET GROUND HAS      
  CAUSED A RAPID RISE ALONG CREEKS AND STREAMS. IN PARTICULAR THIS   
  INCLUDES SWEETWATER CREEK AT LILBURN AND STONE MOUNTAIN CREEK NEAR 
  STONE MOUNTAIN. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  LAWRENCEVILLE...DULUTH...DACULA...BERKELEY LAKE AND DUNWOODY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 OR TWEET US YOUR REPORT AT
NWSATLANTA.

&&

LAT...LON 3379 8438 3394 8437 3403 8419 3407 8390
      3395 8388 3375 8414 3372 8437

$$
1 follow-up statement
858 
WGUS72 KFFC 121424
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1024 AM EDT FRI SEP 12 2014

GAC089-121-135-121434-
/O.CAN.KFFC.FF.W.0036.000000T0000Z-140912T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DEKALB GA-GWINNETT GA-FULTON GA-
1024 AM EDT FRI SEP 12 2014

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EAST CENTRAL
FULTON...GWINNETT AND NORTHERN DEKALB COUNTIES...

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 3379 8438 3394 8437 3403 8419 3407 8390
      3395 8388 3375 8414 3372 8437

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 11, 9:46 PM EDTSpecial Weather StatementFFCFloyd59 min
Sep 12, 2:47 PM EDTSpecial Weather StatementFFCWhite28 min
Sep 12, 2:56 PM EDTSpecial Weather StatementFFCHeard34 min
Sep 12, 3:25 PM EDTSpecial Weather StatementFFCLumpkin, White35 min
Sep 12, 4:11 PM EDTSpecial Weather StatementFFCFloyd34 min
Sep 12, 4:29 PM EDTSpecial Weather StatementFFCWhite31 min
Sep 12, 4:40 PM EDTSpecial Weather StatementFFCPaulding35 min
Sep 12, 4:55 PM EDTSpecial Weather StatementFFCDeKalb35 min
Sep 12, 4:58 PM EDTSpecial Weather StatementFFCClayton32 min
Sep 12, 5:28 PM EDTSpecial Weather StatementFFCGwinnett32 min
Sep 12, 5:36 PM EDTSpecial Weather StatementFFCRockdale24 min
Sep 12, 5:41 PM EDTSpecial Weather StatementFFCDeKalb, Fulton49 min
Sep 12, 5:50 PM EDTSpecial Weather StatementFFCPaulding, Polk40 min
Sep 12, 6:03 PM EDTSpecial Weather StatementFFCDouglas27 min
Sep 12, 6:07 PM EDTSevere Thunderstorm WarningFFCWalton38 min
Sep 12, 6:22 PM EDTSpecial Weather StatementFFCFayette23 min
Sep 12, 6:41 PM EDTSpecial Weather StatementFFCOglethorpe34 min
Sep 12, 6:50 PM EDTSpecial Weather StatementFFCFulton25 min
Sep 12, 7:11 PM EDTSpecial Weather StatementFFCOconee34 min
Sep 12, 7:26 PM EDTSpecial Weather StatementFFCDeKalb, Fulton34 min
Sep 12, 7:59 PM EDTSpecial Weather StatementFFCHarris31 min

Nearby

Flash Flood Warnings in Georgia, 2014Every flash flood warning in 2014

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.