Alert archive / Georgia / Flash Flood Warnings in 2020

Flash Flood Warning 60, NWS Atlanta, GA

September 17, 20204 counties in Georgia

NWS Atlanta, GA issued this flash flood warning at Sep 17, 2020, 5:13 AM EDT for 4 counties in Georgia. It was in force for 6 hr. 3 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 17, 2020, 5:13 AM EDT (09:13 UTC)
Expired: Sep 17, 2020, 11:15 AM EDT
In force: 6 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

Counties Hancock County, GA, Jasper County, GA, Putnam County, GA, Washington County, GA

The radar

The Robins AFB radar (KJGX), 64 km from the middle of the area, began a volume at 09:12 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

Time	Report	Where	Remark
Sep 17, 6:00 AM EDT	FLASH FLOOD	4 W Davisboro, GA	EMA REPORTED STATE ROUTE 24 BETWEEN SANDERSVILLE AND DAVISBORO IS WASHED OUT NEAR PROSSER ROAD. TIME ESTIMATED FROM RADAR.
Sep 17, 8:00 AM EDT	FLASH FLOOD	4 W Davisboro, GA	MULTIPLE WASHOUTS OF SR 24 OCCURED FROM SUN HILL CREEK AND TRIBUTARIES FLOWING INTO THE CREEK, WITH PARTIAL OR COMPLETE COLLAPSES OF THE ROADWAY AT SEVERAL LOCATIONS
Sep 17, 8:00 AM EDT	FLASH FLOOD	Davisboro, GA	ROUGHLY A DOZEN HOMES ON SR 231 WERE SURROUNDED OR INUNDATED WITH WATER ON THE SW SIDE OF DAVISBORO WHEN WILLIAM SWAMP CREEK NEARLY REACHED MAJOR FLOOD STAGE.

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, 9.2 hours before the alert went out and 122 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 540 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 263 m²/s²
0-3 km storm-relative helicity: 345 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

290 
WGUS52 KFFC 170913
FFWFFC
GAC141-159-237-303-171515-
/O.NEW.KFFC.FF.W.0060.200917T0913Z-200917T1515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
513 AM EDT Thu Sep 17 2020

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Jasper County in central Georgia...
  Putnam County in central Georgia...
  Hancock County in east central Georgia...
  Washington County in east central Georgia...

* Until 1115 AM EDT Thursday.

* At 513 AM EDT, Doppler radar indicated heavy rain in in the warned 
  area. Between 1 and 3.5 inches of rain have fallen. Flash flooding 
  is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by heavy rain.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Eatonton, Sandersville, Monticello, Sparta, Davisboro, Tennille, 
  Harrison, Oconee, Shady Dale, Deepstep, Riddleville, Phoenix, 
  Springfield, Devereux, Beulah, Oconee Springs Park, Linton, Plant 
  Harlee Branch, Shoulderbone and Rockville.

Additional rainfall amounts of 1 to 3 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

If you see significant flooding call the National Weather Service 
toll free at 1 8 6 6 7 6 3 4 4 6 6 or tweet us your report at 
NWSATLANTA.

&&

LAT...LON 3343 8353 3348 8328 3340 8324 3336 8316
      3347 8301 3344 8285 3317 8274 3302 8255
      3282 8252 3276 8296 3295 8307 3306 8304
      3306 8311 3315 8310 3319 8329 3313 8382
      3341 8385 3348 8368 3353 8368

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-3 INCHES IN 6 HOURS 

$$

1 follow-up statement

239 
WGUS72 KFFC 171506
FFSFFC

Flash Flood Statement
National Weather Service Peachtree City GA
1106 AM EDT Thu Sep 17 2020

GAC141-159-237-303-171516-
/O.EXP.KFFC.FF.W.0060.000000T0000Z-200917T1515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hancock GA-Jasper GA-Putnam GA-Washington GA-
1106 AM EDT Thu Sep 17 2020

...FLASH FLOOD WARNING WILL EXPIRE AT 1115 AM EDT THIS MORNING FOR 
JASPER, PUTNAM, HANCOCK AND WASHINGTON COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3343 8353 3348 8328 3340 8324 3336 8316
      3347 8301 3344 8285 3317 8274 3302 8255
      3282 8252 3276 8296 3295 8307 3306 8304
      3306 8311 3315 8310 3319 8329 3313 8382
      3341 8385 3348 8368 3353 8368

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 16, 9:10 PM EDT	Flash Flood Warning	FFC	Chattahoochee, Marion, Muscogee, Schley, Stewart, Sumter and 1 more	6 hr
Sep 16, 11:25 PM EDT	Flash Flood Warning	FFC	Crisp, Dooly, Macon, Taylor	7 hr
Sep 17, 12:00 AM EDT	Flash Flood Warning	FFC	Bibb, Bleckley, Crawford, Houston, Peach, Pulaski and 2 more	11 hr
Sep 17, 12:45 AM EDT	Flash Flood Warning	FFC	Harris, Lamar, Monroe, Pike, Talbot, Upson	7 hr
Sep 17, 1:13 AM EDT	Flash Flood Warning	FFC	Meriwether, Troup	5 hr
Sep 17, 2:49 AM EDT	Flash Flood Warning	FFC	Butts, Clayton, Coweta, Fayette, Fulton, Henry and 1 more	7 hr
Sep 17, 2:59 AM EDT	Flash Flood Warning	FFC	Baldwin, Jones, Wilkinson	8 hr
Sep 17, 3:29 AM EDT	Flash Flood Warning	FFC	Chattahoochee, Marion, Muscogee, Schley, Stewart, Sumter and 1 more	3 hr
Sep 17, 3:34 AM EDT	Flash Flood Warning	FFC	DeKalb, Gwinnett, Newton, Rockdale	6 hr
Sep 17, 3:39 AM EDT	Flash Flood Warning	FFC	Cobb, Douglas, Fulton	6 hr
Sep 17, 4:29 AM EDT	River Flood Warning	FFC	DeKalb, Fulton	8 hr
Sep 17, 4:32 AM EDT	River Flood Warning	FFC	DeKalb	11 hr
Sep 17, 4:32 AM EDT	River Flood Warning	FFC	DeKalb, Fulton	10 hr
Sep 17, 4:35 AM EDT	River Flood Warning	FFC	DeKalb	6 hr
Sep 17, 4:42 AM EDT	River Flood Warning	FFC	Fulton, Gwinnett	7 hr
Sep 17, 4:45 AM EDT	River Flood Warning	FFC	Fayette, Spalding	55 hr
Sep 17, 4:45 AM EDT	River Flood Warning	FFC	Crawford, Talbot, Taylor, Upson	28 hr
Sep 17, 4:45 AM EDT	River Flood Warning	FFC	Clayton, Fayette, Spalding	32 hr
Sep 17, 4:50 AM EDT	River Flood Warning	FFC	Chattahoochee, Muscogee	17 hr
Sep 17, 5:04 AM EDT	River Flood Warning	FFC	Lamar, Spalding	9 hr
Sep 17, 5:07 AM EDT	River Flood Warning	FFC	DeKalb, Rockdale	38 hr
Sep 17, 5:07 AM EDT	River Flood Warning	FFC	Forsyth, Fulton	43 hr
Sep 17, 5:07 AM EDT	River Flood Warning	FFC	Gwinnett	25 hr
Sep 17, 5:07 AM EDT	River Flood Warning	FFC	Newton, Rockdale	47 hr
Sep 17, 5:16 AM EDT	River Flood Warning	FFC	Pulaski	6 hr
Sep 17, 5:16 AM EDT	River Flood Warning	FFC	Bibb, Houston, Jones, Monroe, Twiggs	4 days
Sep 17, 5:36 AM EDT	River Flood Warning	FFC	Gwinnett	5 hr
Sep 17, 5:39 AM EDT	River Flood Warning	FFC	Barrow, Jackson	34 hr
Sep 17, 5:39 AM EDT	River Flood Warning	FFC	Johnson, Washington, Wilkinson	5 days
Sep 17, 5:39 AM EDT	River Flood Warning	FFC	Baldwin, Washington, Wilkinson	39 hr
Sep 17, 5:39 AM EDT	River Flood Warning	FFC	Clarke, Greene, Oconee	64 hr
Sep 17, 5:43 AM EDT	River Flood Warning	FFC	DeKalb, Fulton	10 hr
Sep 17, 6:00 AM EDT	River Flood Warning	FFC	DeKalb	4 hr
Sep 17, 6:42 AM EDT	Flash Flood Warning	FFC	Glascock, Jefferson, Warren	6 hr
Sep 17, 6:44 AM EDT	River Flood Warning	FFC	Cobb	4 hr
Sep 17, 6:51 AM EDT	River Flood Warning	FFC	Gwinnett, Walton	12 hr
Sep 17, 6:54 AM EDT	River Flood Warning	FFC	Gwinnett	11 hr
Sep 17, 6:58 AM EDT	River Flood Warning	FFC	Cobb	7 hr
Sep 17, 7:09 AM EDT	River Flood Warning	FFC	Forsyth	16 hr
Sep 17, 7:18 AM EDT	River Flood Warning	FFC	DeKalb, Fulton	118 min
Sep 17, 7:22 AM EDT	River Flood Warning	FFC	Cobb	7 hr
Sep 17, 7:27 AM EDT	River Flood Warning	FFC	Gwinnett	8 hr
Sep 17, 7:31 AM EDT	River Flood Warning	FFC	Fulton	12 hr
Sep 17, 7:47 AM EDT	Flash Flood Warning	FFC	Greene, Taliaferro	5 hr
Sep 17, 9:23 AM EDT	River Flood Warning	FFC	Cherokee, Cobb	5 hr
Sep 17, 9:28 AM EDT	River Flood Warning	FFC	Cobb, Fulton	16 hr
Sep 17, 10:31 AM EDT	River Flood Warning	FFC	Cobb, Fulton	13 hr
Sep 17, 10:31 AM EDT	River Flood Warning	FFC	Cobb, Fulton	11 hr
Sep 17, 10:31 AM EDT	River Flood Warning	FFC	Carroll, Coweta, Heard	12 hr
Sep 17, 11:03 AM EDT	River Flood Warning	FFC	Jefferson, Washington	23 hr
Sep 17, 11:23 AM EDT	River Flood Warning	FFC	Jones	15 hr
Sep 17, 1:31 PM EDT	River Flood Warning	FFC	Johnson, Laurens, Washington, Wilkinson	44 hr
Sep 17, 2:25 PM EDT	River Flood Warning	FFC	Newton, Rockdale	6 hr
Sep 17, 2:40 PM EDT	River Flood Warning	FFC	Taliaferro, Wilkes	33 hr
Sep 17, 2:44 PM EDT	River Flood Warning	FFC	Jefferson	3 hr
Sep 17, 3:32 PM EDT	River Flood Warning	FFC	Coweta, Fayette, Spalding	11 hr
Sep 17, 6:42 PM EDT	River Flood Warning	FFC	Elbert, Madison, Oglethorpe	3 hr
Sep 17, 7:22 PM EDT	River Flood Warning	FFC	Dooly	4 hr

Nearby

Flash Flood Warnings in Georgia, 2020 Every flash flood warning in 2020

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.