Alert archive / Georgia / Flash Flood Warnings in 2009

Flash Flood Warning 20, NWS Atlanta, GA

September 17, 20094 counties in Georgia

NWS Atlanta, GA issued this flash flood warning at Sep 17, 2009, 7:54 PM EDT for 4 counties in 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: Sep 17, 2009, 7:54 PM EDT (23:54 UTC)
Expired: Sep 18, 2009, 1:45 AM EDT
In force: 6 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

Counties Greene County, GA, Oglethorpe County, GA, Taliaferro County, GA, Wilkes County, GA

The radar

The Robins AFB radar (KJGX), 112 km from the middle of the area, began a volume at 23:53 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, 11.9 hours before the alert went out and 127 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: 718 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 468 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

000 
WGUS52 KFFC 172354
FFWFFC
GAC133-221-265-317-180545-
/O.NEW.KFFC.FF.W.0020.090917T2354Z-090918T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
754 PM EDT THU SEP 17 2009

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN GREENE COUNTY IN EAST CENTRAL GEORGIA
  NORTHERN TALIAFERRO COUNTY IN EAST CENTRAL GEORGIA
  SOUTHWESTERN WILKES COUNTY IN EAST CENTRAL GEORGIA
  SOUTHERN OGLETHORPE COUNTY IN NORTHEAST GEORGIA

* UNTIL 145 AM EDT

* AT 742 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  NUMEROUS THUNDERSTORMS WITH HEAVY RAIN OVER THE WARNED AREA. RADAR
  ESTIMATES OF 3 TO 5 INCHES HAVE OCCURRED SINCE 500 PM EDT. THE     
  KETTLE CREEK AND DRY FORK CREEK BASINS HAVE RECEIVED THE MOST RAIN
  IN TALIAFERRO...WILKES AND OGLETHORE COUNTIES.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RAYLE AND
  MAXEYS.

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

&&

LAT...LON 3360 8266 3357 8332 3360 8335 3363 8336
      3364 8336 3369 8340 3370 8338 3373 8330
      3378 8328 3385 8287

$$
16

2 follow-up statements

000 
WGUS72 KFFC 180148
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
948 PM EDT THU SEP 17 2009

GAC133-221-265-317-180545-
/O.CON.KFFC.FF.W.0020.000000T0000Z-090918T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TALIAFERRO GA-GREENE GA-WILKES GA-OGLETHORPE GA-
948 PM EDT THU SEP 17 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 AM EDT FOR
SOUTHERN OGLETHORPE...SOUTHWESTERN WILKES...NORTHERN GREENE AND
NORTHERN TALIAFERRO COUNTIES...

AT 941 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED     
THUNDERSTORMS WITH OCCASIONAL HEAVY RAIN OVER THE WARNED AREA. 
RADAR ESTIMATES OF 3 TO 6 INCHES HAVE OCCURRED SINCE 500 PM EDT.
THE KETTLE CREEK AND DRY FORK CREEK BASINS HAVE RECEIVED THE MOST 
RAIN IN TALIAFERRO...WILKES AND OGLETHORPE COUNTIES.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RAYLE AND
MAXEYS

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

&&

LAT...LON 3360 8266 3357 8332 3360 8335 3363 8336
      3364 8336 3369 8340 3370 8338 3373 8330
      3378 8328 3385 8287

$$
16

000 
WGUS72 KFFC 180527
FFSFFC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
127 AM EDT FRI SEP 18 2009

GAC133-221-265-317-180545-
/O.CON.KFFC.FF.W.0020.000000T0000Z-090918T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
TALIAFERRO GA-GREENE GA-WILKES GA-OGLETHORPE GA-
127 AM EDT FRI SEP 18 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 AM EDT FOR
SOUTHERN OGLETHORPE...SOUTHWESTERN WILKES...NORTHERN GREENE AND
NORTHERN TALIAFERRO COUNTIES...

AT 112 AM EDT...NATIONAL WEATHER SERVICE RADAR INDICATED LIGHT
TO MODERATE RAIN OVER THE WARNED AREA. RADAR ESTIMATES OF 3 TO 6 
INCHES HAVE OCCURRED SINCE 500 PM EDT. THE KETTLE CREEK AND DRY FORK 
CREEK BASINS HAVE RECEIVED THE MOST RAIN IN TALIAFERRO...WILKES AND 
OGLETHORPE COUNTIES.

A U.S. GEOLOGICAL SURVEY STREAM GAGE ON THE KETTLE CREEK...AROUND
8 MILES SOUTHWEST OF WASHINGTON...CRESTED AT 11.8 FEET AT 1100 PM 
EDT THURSDAY. FLOOD STAGE IS 14 FEET. OTHER STREAMS AND CREEKS IN 
THE WARNED AREA ARE RECEDING SO THE FLASH FLOOD WARNING WILL BE 
ALLOWED TO EXPIRE.

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

&&

LAT...LON 3360 8266 3357 8332 3360 8335 3363 8336
      3364 8336 3369 8340 3370 8338 3373 8330
      3378 8328 3385 8287

$$
16

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 16, 8:19 PM EDT	Flash Flood Warning	FFC	Morgan, Newton	4 hr
Sep 17, 1:20 PM EDT	Flood Watch	FFC	Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 90 more	5 days
Sep 17, 4:09 PM EDT	Flash Flood Warning	FFC	Bibb	3 hr
Sep 17, 4:48 PM EDT	Flash Flood Warning	FFC	Forsyth, Fulton	3 hr
Sep 17, 5:57 PM EDT	Flash Flood Warning	FFC	Morgan	6 hr
Sep 17, 6:59 PM EDT	Areal Flood Warning	FFC	Bibb	4 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.