Alert archive / Georgia / Flash Flood Warnings in 2011

Flash Flood Warning 9, NWS Atlanta, GA

August 5, 2011Madison County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 5, 2011, 6:32 PM EDT for Madison County, Georgia. It was in force for 2 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 5, 2011, 6:32 PM EDT (22:32 UTC)
Expired: Aug 5, 2011, 8:59 PM EDT
In force: 2 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

County Madison County, GA

The radar

The Greer radar (KGSP), 119 km from the middle of the area, began a volume at 22:33 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, 10.5 hours before the alert went out and 153 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 369 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 1148 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: -23 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.

569 
WGUS52 KFFC 052232
FFWFFC
GAC195-060430-
/O.NEW.KFFC.FF.W.0009.110805T2232Z-110806T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
632 PM EDT FRI AUG 5 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN MADISON COUNTY IN NORTHEAST GEORGIA

* UNTIL 1230 AM EDT

* AT 624 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  POSSIBLE FLASH FLOODING FROM THUNDERSTORMS OVER THE WARNED AREA.
  RADAR PRECIPITATION ESTIMATES UP TO 3 INCHES IN ONE HOUR HAVE 
  OCCURRED NEAR COMER AND CARLTON...PRIMARILY IN THE FORK CREEK      
  BASIN. ANOTHER INCH IS POSSIBLE BEFORE THE THUNDERSTORMS DISSIPATE 
  OR MOVE AWAY FROM THE WARNED AREA.

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

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.

&&

LAT...LON 3416 8307 3405 8298 3403 8300 3403 8303
      3401 8305 3403 8309 3403 8311 3405 8313
      3403 8317 3417 8317 3417 8309

$$

16

1 follow-up statement

567 
WGUS72 KFFC 060059
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
859 PM EDT FRI AUG 5 2011

GAC195-060108-
/O.CAN.KFFC.FF.W.0009.000000T0000Z-110806T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MADISON GA-
859 PM EDT FRI AUG 5 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHEASTERN
MADISON COUNTY...

NO FLOODING WAS OCCURRING.

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 3416 8307 3405 8298 3403 8300 3403 8303
      3401 8305 3403 8309 3403 8311 3405 8313
      3403 8317 3417 8317 3417 8309

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 4:49 PM EDT	Special Weather Statement	FFC	Banks	41 min
Aug 5, 4:56 PM EDT	Severe Thunderstorm Warning	FFC	Dade, Walker	49 min
Aug 5, 5:28 PM EDT	Special Weather Statement	FFC	Madison, Oglethorpe	32 min
Aug 5, 5:50 PM EDT	Special Weather Statement	FFC	Walker	25 min
Aug 5, 6:02 PM EDT	Special Weather Statement	FFC	Madison, Oglethorpe, Wilkes	43 min
Aug 5, 6:17 PM EDT	Severe Thunderstorm Warning	FFC	Madison	28 min
Aug 5, 7:33 PM EDT	Special Weather Statement	FFC	Oconee, Walton	27 min

Nearby

Flash Flood Warnings in Georgia, 2011 Every flash flood warning in 2011

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.