Alert archive / Georgia / Flash Flood Warnings in 2009

Flash Flood Warning 41, NWS Atlanta, GA

September 21, 20094 counties in Georgia

NWS Atlanta, GA issued this flash flood warning at Sep 21, 2009, 10:11 PM EDT for 4 counties in Georgia. It was in force for 6 hr. 2 reports 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 21, 2009, 10:11 PM EDT (02:11 UTC)
Expired
Sep 22, 2009, 4:00 AM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

Counties Bibb County, GA, Houston County, GA, Peach County, GA, Twiggs County, GA

The radar

The Robins AFB radar (KJGX), 31 km from the middle of the area, began a volume at 02:10 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 21, 10:49 PM EDTFLASH FLOOD2 Wsw Warner Robins, GAPUBLIC REPORTED 4 FEET OF WATER COVERING A ROAD NEAR WRIGHTS MILL.
Sep 21, 10:58 PM EDTFLASH FLOOD1 Wsw Warner Robins, GAPUBLIC REPORTED A BRIDGE SUBMERGED IN WATER ON NELSON RD. LARGE DEBRIS WAS REPORTED FLOATING IN THE WATER.

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 00:00Z, 2.2 hours before the alert went out and 109 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 00:00Z on 2009-09-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 835 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 00:00Z on 2009-09-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 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
835 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
624 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
73 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS52 KFFC 220211
FFWFFC
GAC021-153-225-289-220800-
/O.NEW.KFFC.FF.W.0041.090922T0211Z-090922T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1011 PM EDT MON SEP 21 2009

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN BIBB COUNTY IN CENTRAL GEORGIA
  NORTHEASTERN HOUSTON COUNTY IN CENTRAL GEORGIA
  NORTHEASTERN PEACH COUNTY IN CENTRAL GEORGIA
  TWIGGS COUNTY IN CENTRAL GEORGIA

* UNTIL 400 AM EDT

* AT 1004 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
A LINE OF INTENSE THUNDERSTORMS CONTAINING VERY HEAVY RAIN FROM NEAR 
BYRON TO EAST OF MACON. ALTHOUGH THE RAIN WILL TAPER OFF BY 11 PM... 
RUNOFF FROM THE VERY HEAVY RAIN WILL LEAD TO FLASH FLOODING OF 
CREEKS AND STREAMS AS WELL AS LOW LYING AND POOR DRAINAGE AREAS 
THROUGH THE EARLY MORNING HOURS. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BYRON... 
LAKEWOOD...WARNER ROBINS...DRY BRANCH AND JEFFERSONVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

IF YOU SEE SIGNIFICANT FLOODING...MOVE TO A SAFE PLACE THEN CALL THE 
NATIONAL WEATHER SERVICE TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6.

&&

LAT...LON 3258 8388 3264 8384 3269 8376 3269 8374
      3272 8378 3276 8375 3285 8340 3266 8329
      3250 8346

$$
1 follow-up statement
000 
WGUS72 KFFC 220753
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
353 AM EDT TUE SEP 22 2009

GAC021-153-225-289-220800-
/O.CON.KFFC.FF.W.0041.000000T0000Z-090922T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HOUSTON GA-PEACH GA-TWIGGS GA-BIBB GA-
353 AM EDT TUE SEP 22 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 AM EDT FOR
SOUTHEASTERN BIBB...TWIGGS...NORTHEASTERN PEACH AND NORTHEASTERN
HOUSTON COUNTIES...

AT 345 AM EDT...THE SHOWERS HAVE DIMINISHED OVER THE WARNED AREA. 
RADAR ESTIMATES OF 1 TO 3 INCHES HAVE OCCURRED SINCE 900 PM EDT 
MONDAY. 

THE WARNING WILL BE ALLOWED TO EXPIRE AT 400 AM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

&&

LAT...LON 3258 8388 3264 8384 3269 8376 3269 8374
      3272 8378 3276 8375 3285 8340 3266 8329
      3250 8346

$$
16

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 21, 8:40 PM EDTFlash Flood WarningFFCBaldwin, Greene, Hancock, Jasper, Jones, Morgan and 5 more6 hr
Sep 21, 9:07 PM EDTAreal Flood WarningFFCCarroll, Cherokee, Cobb, Coweta, DeKalb, Douglas and 6 more18 hr
Sep 21, 9:48 PM EDTAreal Flood WarningFFCCatoosa, Chattooga, Dade, Murray, Walker, Whitfield12 hr
Sep 21, 10:34 PM EDTRiver Flood WarningFFCBaldwin, Washington, Wilkinson18 hr
Sep 21, 11:32 PM EDTFlash Flood WarningFFCDooly, Houston, Macon, Peach5 hr
Sep 21, 11:56 PM EDTRiver Flood WarningFFCBartow, Floyd11 hr
Sep 22, 7:04 AM EDTRiver Flood WarningFFCDeKalb, Rockdale40 hr
Sep 22, 7:04 AM EDTRiver Flood WarningFFCNewton, Rockdale51 hr
Sep 22, 7:04 AM EDTRiver Flood WarningFFCWhitfield51 hr
Sep 22, 7:04 AM EDTRiver Flood WarningFFCPutnam8 hr
Sep 22, 9:26 AM EDTRiver Flood WarningFFCMurray, Whitfield15 hr
Sep 22, 9:26 AM EDTRiver Flood WarningFFCBarrow, Jackson14 hr
Sep 22, 9:43 AM EDTAreal Flood WarningFFCCatoosa, Chattooga, Dade, Murray, Walker, Whitfield24 hr
Sep 22, 12:05 PM EDTAreal Flood WarningFFCDooly6 hr
Sep 22, 1:52 PM EDTRiver Flood WarningFFCClayton, Fayette, Spalding9 hr
Sep 22, 2:29 PM EDTAreal Flood WarningFFCCarroll, Cherokee, Cobb, Coweta, DeKalb, Douglas and 6 more18 hr
Sep 22, 5:54 PM EDTRiver Flood WarningFFCDooly18 hr

Nearby

Flash Flood Warnings in Georgia, 2009Every flash flood warning in 2009

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.