Alert archive / Georgia / Flash Flood Warnings in 2009

Flash Flood Warning 28, NWS Atlanta, GA

September 20, 2009Union County, Georgia

NWS Atlanta, GA issued this flash flood warning at Sep 20, 2009, 6:34 AM EDT for Union 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 20, 2009, 6:34 AM EDT (10:34 UTC)
Expired
Sep 20, 2009, 12:30 PM EDT
In force
6 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

County Union County, GA

The radar

The Greer radar (KGSP), 160 km from the middle of the area, began a volume at 10:34 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 20, 7:30 AM EDTFLASH FLOOD3 N Vogel State Park, GAWOLF CREEK CAME OUT OF IT BANKS AND CAUSED MINOR FLOODING OF PORTIONS OF WOLF PEN GAP ROAD AND VIRGINIA DRIVE.

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, 10.6 hours before the alert went out and 165 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 2009-09-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1577 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 2009-09-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 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
1577 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
548 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
177 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.

000 
WGUS52 KFFC 201034
FFWFFC
GAC291-201630-
/O.NEW.KFFC.FF.W.0028.090920T1034Z-090920T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
634 AM EDT SUN SEP 20 2009

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  UNION COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 1230 PM EDT

* AT 633 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAIN FROM HEAVY SHOWERS AND THUNDERSTORMS MOVING 
  NORTHEAST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO JONES
  CREEK...OWLTOWN...LOW GAP SHELTER...TRACK ROCK AND BRASSTOWN BALD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS...OR WATERS OF UNKNOWN DEPTH...ON FOOT OR IN
AN AUTOMOBILE.

IF YOU SEE SIGNIFICANT FLOODING CALL THE NATIONAL WEATHER SERVICE
TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6.

&&

LAT...LON 3489 8385 3490 8382 3478 8378 3479 8379
      3476 8383 3472 8385 3473 8395 3464 8403
      3465 8410 3464 8414 3472 8410 3479 8410
      3480 8415 3487 8411 3491 8414 3493 8392

$$
1 follow-up statement
000 
WGUS72 KFFC 201300
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
900 AM EDT SUN SEP 20 2009

GAC291-201630-
/O.CON.KFFC.FF.W.0028.000000T0000Z-090920T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
UNION GA-
900 AM EDT SUN SEP 20 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 PM EDT FOR
UNION COUNTY...

AT 857 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE SHOWERS PRODUCING HEAVY RAIN. WHILE MOST OF THE HEAVIEST 
RAIN HAS MOVED OUT OF THE AREA...RUNOFF WILL CONTINUE...AND 
ADDITIONAL STORMS ARE EXPECTED THROUGH THE DAY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE 
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME 
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR 
CREEKS.

IN HILLY TERRAIN THERE ARE LOW WATER CROSSINGS WHICH ARE POTENTIALLY
DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS FLOODED
ROADS...FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW INCHES OF SWIFTLY
FLOWING WATER TO CARRY VEHICLES AWAY.

IF YOU SEE SIGNIFICANT FLOODING CALL THE NATIONAL WEATHER SERVICE
TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6.

&&

LAT...LON 3489 8385 3490 8382 3478 8378 3479 8379
      3476 8383 3472 8385 3473 8395 3464 8403
      3465 8410 3464 8414 3472 8410 3479 8410
      3480 8415 3487 8411 3491 8414 3493 8392

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 20, 5:37 AM EDTFlash Flood WarningFFCLumpkin6 hr
Sep 20, 6:43 AM EDTFlash Flood WarningFFCWhite6 hr
Sep 20, 7:40 AM EDTFlash Flood WarningFFCTowns6 hr
Sep 20, 11:23 AM EDTAreal Flood WarningFFCLumpkin112 min
Sep 20, 11:59 AM EDTRiver Flood WarningFFCClarke, Greene, Oconee5 days
Sep 20, 12:23 PM EDTAreal Flood WarningFFCUnion, White52 min
Sep 20, 1:17 PM EDTAreal Flood WarningFFCLumpkin, Towns, Union, White6 hr
Sep 20, 1:51 PM EDTAreal Flood WarningFFCCobb6 hr
Sep 20, 2:45 PM EDTFlash Flood WarningFFCCherokee6 hr
Sep 20, 5:35 PM EDTRiver Flood WarningFFCDawson, Forsyth38 hr
Sep 20, 6:32 PM EDTFlash Flood WarningFFCCatoosa, Walker6 hr
Sep 20, 6:56 PM EDTFlash Flood WarningFFCPaulding4 hr
Sep 20, 7:14 PM EDTFlash Flood WarningFFCCobb4 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.