Alert archive / Georgia / Flash Flood Warnings in 2020

Flash Flood Warning 26, NWS Atlanta, GA

July 3, 2020Chattooga County, Georgia

NWS Atlanta, GA issued this flash flood warning at Jul 3, 2020, 11:05 PM EDT for Chattooga 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 3, 2020, 11:05 PM EDT (03:05 UTC)
Expired: Jul 4, 2020, 5:02 AM EDT
In force: 6 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

County Chattooga County, GA

The radar

The Northeast Alabama radar (KHTX), 90 km from the middle of the area, began a volume at 03:06 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, 3.1 hours before the alert went out and 138 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: 734 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 1695 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

499 
WGUS52 KFFC 040305
FFWFFC
GAC055-040915-
/O.NEW.KFFC.FF.W.0026.200704T0305Z-200704T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
1105 PM EDT Fri Jul 3 2020

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Southwestern Chattooga County in northwestern Georgia...

* Until 515 AM EDT Saturday.

* At 1105 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

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

* Some locations that will experience flash flooding include...
  Summerville, Lyerly, Holland, James H. Floyd State Park and 
  Chattoogaville.

This includes the following streams and drainages...
  Chattooga River, Hinton Creek, Cabin Creek, Heath Creek, 
  Taliaferro Creek, Coosa River, Vanns Branch, Moss Creek, Kings 
  Creek, Selman Creek, Clarks Creek, Little Armuchee Creek and 
  Raccoon Creek.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area.

LAT...LON 3429 8546 3436 8548 3448 8535 3448 8529
      3440 8525 3437 8533 3433 8537

FLASH FLOOD...RADAR INDICATED

$$

1 follow-up statement

606 
WGUS72 KFFC 040902
FFSFFC

Flash Flood Statement
National Weather Service Peachtree City GA
502 AM EDT Sat Jul 4 2020

GAC055-040912-
/O.CAN.KFFC.FF.W.0026.000000T0000Z-200704T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chattooga GA-
502 AM EDT Sat Jul 4 2020

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN CHATTOOGA 
COUNTY...

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

LAT...LON 3429 8546 3436 8548 3448 8535 3448 8529
      3440 8525 3437 8533 3433 8537

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 8:20 PM EDT	Special Weather Statement	FFC	Webster	40 min
Jul 3, 10:34 PM EDT	Special Weather Statement	FFC	Chattooga, Floyd	56 min
Jul 4, 2:23 AM EDT	Special Weather Statement	FFC	Murray	52 min
Jul 4, 5:22 AM EDT	Special Weather Statement	FFC	Murray	53 min
Jul 4, 9:14 AM EDT	Special Weather Statement	FFC	Murray	2 hr
Jul 4, 2:55 PM EDT	Special Weather Statement	FFC	Clayton	35 min
Jul 4, 3:45 PM EDT	Special Weather Statement	FFC	Douglas	30 min
Jul 4, 5:09 PM EDT	Special Weather Statement	FFC	Polk	36 min
Jul 4, 5:22 PM EDT	Special Weather Statement	FFC	Haralson	38 min
Jul 4, 5:23 PM EDT	Special Weather Statement	FFC	Walker	37 min
Jul 4, 5:44 PM EDT	Severe Thunderstorm Warning	FFC	Haralson, Polk	46 min
Jul 4, 7:48 PM EDT	Special Weather Statement	FFC	Barrow	27 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.