Alert archive / Georgia / Flash Flood Warnings in 2013

Flash Flood Warning 81, NWS Atlanta, GA

August 14, 2013Henry County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 14, 2013, 6:22 PM EDT for 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 14, 2013, 6:22 PM EDT (22:22 UTC)
Expired
Aug 15, 2013, 12:15 AM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

County Henry County, GA

The radar

The Atlanta radar (KFFC), 32 km from the middle of the area, began a volume at 22:24 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, 10.4 hours before the alert went out and 26 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 2013-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 307 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 2013-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -19 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
307 J/kg
Mixed-layer CIN
-47 J/kg
Mixed-layer LCL
775 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
-19 m²/s²
0-3 km storm-relative helicity
25 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.

990 
WGUS52 KFFC 142222
FFWFFC
GAC151-150415-
/O.NEW.KFFC.FF.W.0081.130814T2222Z-130815T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
622 PM EDT WED AUG 14 2013

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN HENRY COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 1215 AM EDT

* AT 615 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING FROM HEAVY RAIN OVER THE WARNED AREA. 2 TO 3 INCHES 
  OF RAIN HAS ALREADY FALLEN WITH THE POTENTIAL FOR AN ADDITIONAL    
  INCH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MCDONOUGH.

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.

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. YOU CAN ALSO TWEET YOUR REPORT
USING HASHTAG GAWX.

&&

LAT...LON 3348 8429 3349 8411 3333 8411 3333 8415
      3334 8415 3334 8424 3335 8425 3336 8429
      3339 8430

$$
1 follow-up statement
422 
WGUS72 KFFC 142331
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
731 PM EDT WED AUG 14 2013

GAC151-150415-
/O.CON.KFFC.FF.W.0081.000000T0000Z-130815T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HENRY GA-
731 PM EDT WED AUG 14 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 AM EDT FOR
SOUTHWESTERN HENRY COUNTY...

AT 725 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE MODERATE TO HEAVY RAIN PRODUCING FLASH FLOODING OVER THE 
WARNED AREA. RADAR ESTIMATES ARE ON THE ORDER OF 3 TO 5 INCHES OVER 
THE WARNED AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MCDONOUGH AND
HAMPTON

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF CLOSE TO AN INCH ARE POSSIBLE IN THE 
WARNED AREA.

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. YOU CAN ALSO TWEET YOUR REPORT
USING HASHTAG GAWX.

&&

LAT...LON 3348 8429 3349 8411 3333 8411 3333 8415
      3334 8415 3335 8423 3335 8425 3336 8429
      3339 8430

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 3:47 PM EDTSpecial Weather StatementFFCMuscogee58 min
Aug 14, 4:14 PM EDTFlash Flood WarningFFCMuscogee6 hr
Aug 14, 4:51 PM EDTSpecial Weather StatementFFCDodge54 min
Aug 14, 5:47 PM EDTSpecial Weather StatementFFCDodge, Wilcox58 min
Aug 14, 5:51 PM EDTSpecial Weather StatementFFCMacon54 min
Aug 14, 6:02 PM EDTSpecial Weather StatementFFCHenry43 min
Aug 14, 6:33 PM EDTSpecial Weather StatementFFCTelfair57 min
Aug 14, 6:47 PM EDTSpecial Weather StatementFFCDeKalb43 min
Aug 14, 6:59 PM EDTSpecial Weather StatementFFCWheeler31 min
Aug 14, 7:46 PM EDTSpecial Weather StatementFFCLaurens59 min

Nearby

Flash Flood Warnings in Georgia, 2013Every flash flood warning in 2013

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.