Alert archive / Georgia / Flash Flood Warnings in 2009

Flash Flood Warning 13, NWS Atlanta, GA

September 1, 2009Sumter County, Georgia

NWS Atlanta, GA issued this flash flood warning at Sep 1, 2009, 12:29 AM EDT for Sumter 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: Sep 1, 2009, 12:29 AM EDT (04:29 UTC)
Expired: Sep 1, 2009, 2:36 AM EDT
In force: 2 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

County Sumter County, GA

The radar

The Robins AFB radar (KJGX), 96 km from the middle of the area, began a volume at 04:28 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 00:00Z, 4.5 hours before the alert went out and 154 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: 1431 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 708 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: 41 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

000 
WGUS52 KFFC 010429
FFWFFC
GAC261-010830-
/O.NEW.KFFC.FF.W.0013.090901T0429Z-090901T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1229 AM EDT TUE SEP 1 2009

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN SUMTER COUNTY IN WEST CENTRAL GEORGIA

* UNTIL 430 AM EDT

* AT 1226 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
   VERY HEAVY RAIN FROM A THUNDERSTORM NEAR DESOTO..MOVING         
   SOUTHEAST AT 5   MPH.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF UP TO 2 INCHES ARE POSSIBLE IN
THE WARNED AREA.

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 CALL THE NATIONAL WEATHER SERVICE
TOLL FREE AT 1 8 6 6 7 6 3 4 4 6 6.

&&

LAT...LON 3212 8411 3209 8398 3195 8394 3192 8411

$$

1 follow-up statement

000 
WGUS72 KFFC 010636
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
236 AM EDT TUE SEP 1 2009

GAC261-010646-
/O.CAN.KFFC.FF.W.0013.000000T0000Z-090901T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SUMTER GA-
236 AM EDT TUE SEP 1 2009

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EASTERN SUMTER
COUNTY...

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 3212 8411 3209 8398 3195 8394 3192 8411

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 31, 11:53 PM EDT	Flash Flood Warning	FFC	Heard	3 hr

Nearby

Flash Flood Warnings in Georgia, 2009 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.