Alert archive / Georgia / Flash Flood Warnings in 2017

Flash Flood Warning 35, NWS Atlanta, GA

July 24, 2017Henry County, Georgia

NWS Atlanta, GA issued this flash flood warning at Jul 24, 2017, 5:15 PM EDT for Henry County, 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: Jul 24, 2017, 5:15 PM EDT (21:15 UTC)
Expired: Jul 24, 2017, 11:15 PM EDT
In force: 6 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

County Henry County, GA

The radar

The Atlanta radar (KFFC), 41 km from the middle of the area, began a volume at 21:15 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, 9.3 hours before the alert went out and 35 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: 1248 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 731 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 25 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

893 
WGUS52 KFFC 242115
FFWFFC
GAC151-250315-
/O.NEW.KFFC.FF.W.0035.170724T2115Z-170725T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
515 PM EDT MON JUL 24 2017

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Henry County in north central Georgia...

* Until 1115 PM EDT Monday

* At 513 PM EDT, Doppler radar showed thunderstorms producing heavy 
  rain across the warned area. Two to three inches of rain have 
  already fallen in parts of the area. 

* Some locations that will experience flooding include...
  McDonough, Stockbridge, Hampton, Lovejoy, Locust Grove,
  Blacksville, Ola, Hidden Valley Park, Luella, Atlanta Motor
  Speedway, Flippen, Kelleytown and Eagles Landing.

Additional rainfall amounts up to two inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

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 8432 3344 8429 3353 8428 3359 8424
      3362 8425 3363 8418 3356 8413 3357 8411
      3354 8405 3352 8405 3352 8404 3349 8403
      3348 8395 3345 8392 3338 8399 3336 8403
      3330 8407 3330 8413 3334 8415 3335 8435

$$

1 follow-up statement

892 
WGUS72 KFFC 250139
FFSFFC

Flash Flood Statement
National Weather Service Peachtree City GA
939 PM EDT MON JUL 24 2017

GAC151-250149-
/O.CAN.KFFC.FF.W.0035.000000T0000Z-170725T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Henry GA-
939 PM EDT MON JUL 24 2017

...THE FLASH FLOOD WARNING FOR HENRY COUNTY IS CANCELLED...

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

LAT...LON 3343 8432 3344 8429 3353 8428 3359 8424
      3362 8425 3363 8418 3356 8413 3357 8411
      3354 8405 3352 8405 3352 8404 3349 8403
      3348 8395 3345 8392 3338 8399 3336 8403
      3330 8407 3330 8413 3334 8415 3335 8435

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 8:20 PM EDT	Special Weather Statement	FFC	Greene, Oglethorpe	25 min
Jul 23, 8:46 PM EDT	Special Weather Statement	FFC	Greene, Oconee, Oglethorpe, Taliaferro, Wilkes	29 min
Jul 23, 8:55 PM EDT	Severe Thunderstorm Warning	FFC	Greene, Oglethorpe	50 min
Jul 23, 9:21 PM EDT	Severe Thunderstorm Warning	FFC	Greene, Hancock, Taliaferro, Warren	39 min
Jul 23, 9:56 PM EDT	Severe Thunderstorm Warning	FFC	Glascock, Warren	49 min
Jul 23, 10:36 PM EDT	Special Weather Statement	FFC	Washington	24 min
Jul 23, 10:38 PM EDT	River Flood Warning	FFC	Gwinnett	24 hr
Jul 23, 11:28 PM EDT	Special Weather Statement	FFC	Gilmer	32 min
Jul 24, 2:55 PM EDT	Special Weather Statement	FFC	Baldwin, Jones, Monroe	50 min
Jul 24, 3:06 PM EDT	Special Weather Statement	FFC	Glascock	39 min
Jul 24, 3:08 PM EDT	Special Weather Statement	FFC	DeKalb	52 min
Jul 24, 3:14 PM EDT	Special Weather Statement	FFC	Jasper	46 min
Jul 24, 3:34 PM EDT	Special Weather Statement	FFC	Polk	26 min
Jul 24, 3:46 PM EDT	Special Weather Statement	FFC	Butts, Jasper	44 min
Jul 24, 3:49 PM EDT	Special Weather Statement	FFC	Glascock, Jefferson	41 min
Jul 24, 3:58 PM EDT	Special Weather Statement	FFC	Coweta	47 min
Jul 24, 4:09 PM EDT	Special Weather Statement	FFC	Henry	51 min
Jul 24, 4:18 PM EDT	Special Weather Statement	FFC	Fayette	42 min
Jul 24, 4:22 PM EDT	Severe Thunderstorm Warning	FFC	Butts, Henry, Newton	38 min
Jul 24, 4:25 PM EDT	Severe Thunderstorm Warning	FFC	Washington	50 min
Jul 24, 4:51 PM EDT	Special Weather Statement	FFC	Clayton, Fayette, Henry, Spalding	39 min
Jul 24, 4:56 PM EDT	Special Weather Statement	FFC	Johnson, Washington	49 min
Jul 24, 5:31 PM EDT	Special Weather Statement	FFC	Pike, Upson	44 min
Jul 24, 5:35 PM EDT	Special Weather Statement	FFC	Lamar	40 min
Jul 24, 6:13 PM EDT	Special Weather Statement	FFC	Upson	47 min
Jul 24, 6:25 PM EDT	Special Weather Statement	FFC	Harris, Talbot	35 min
Jul 24, 7:01 PM EDT	Flash Flood Warning	FFC	Harris, Meriwether, Talbot, Taylor, Upson	6 hr
Jul 24, 7:06 PM EDT	Special Weather Statement	FFC	Crawford, Harris, Macon, Peach, Talbot, Taylor	39 min
Jul 24, 7:38 PM EDT	Special Weather Statement	FFC	Crawford, Houston, Macon, Peach, Schley, Taylor	37 min
Jul 24, 7:44 PM EDT	Special Weather Statement	FFC	Sumter	46 min

Nearby

Flash Flood Warnings in Georgia, 2017 Every flash flood warning in 2017

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.