Alert archive / Georgia / Flash Flood Warnings in 2021

Flash Flood Warning 12, NWS Atlanta, GA

June 19, 2021Chattooga County, Georgia

NWS Atlanta, GA issued this flash flood warning at Jun 19, 2021, 11:15 PM EDT for Chattooga County, Georgia. It was in force for 10 hr. 1 report 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: Jun 19, 2021, 11:15 PM EDT (03:15 UTC)
Expired: Jun 20, 2021, 9:00 AM EDT
In force: 10 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

County Chattooga County, GA

The radar

The Northeast Alabama radar (KHTX), 92 km from the middle of the area, began a volume at 03:15 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.

What was reported inside it

Time	Report	Where	Remark
Jun 20, 1:00 AM EDT	FLASH FLOOD	Summerville, GA	SIGNIFICANT FLOODING OCCURRED IN THE CITY OF SUMMERVILLE WITH NUMEROUS INTERSECTIONS, INCLUDING HWY 48 AND 27, UNDERWATER AND NUMEROUS BUSINESSES WITH WATER DAMAGE. FLOODING OCCURRED DUE TO FLASH FLOODING OF THE TOWN BRANCH CREEK WHICH RUNS THROUGH THE CITY.

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, 3.3 hours before the alert went out and 137 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: 252 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 651 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 340 m²/s²
0-3 km storm-relative helicity: 516 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.7

Open this sounding in Storm Lab

The text

As transmitted.

263 
WGUS52 KFFC 200315
FFWFFC
GAC055-200915-
/O.NEW.KFFC.FF.W.0012.210620T0315Z-210620T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
1115 PM EDT Sat Jun 19 2021

The National Weather Service in Peachtree City has issued a

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

* Until 515 AM EDT.

* At 1115 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Summerville, Trion, Lyerly, Menlo, James H. Floyd State Park, 
  Berryton, Tidings, Holland, Cloudland, Chattoogaville and Subligna.

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.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3429 8539 3429 8546 3459 8553 3459 8511
      3444 8518 3443 8522 3442 8522 3442 8524
      3440 8525 3437 8533

FLASH FLOOD...RADAR INDICATED

$$

1 follow-up statement

713 
WGUS52 KFFC 200546
FFWFFC
GAC055-201300-
/O.EXT.KFFC.FF.W.0012.000000T0000Z-210620T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
146 AM EDT Sun Jun 20 2021

The National Weather Service in Peachtree City has extended the

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

* Until 900 AM EDT Sunday.

* At 146 AM EDT, emergency management reported multiple homes and 
  businesses inundated by water. Between 2.5 and 3.5 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area through morning. Flash flooding is 
  already occurring.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Emergency management reported.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Summerville, Trion, Lyerly, Menlo, James H. Floyd State Park, 
  Berryton, Tidings, Holland, Cloudland, Chattoogaville and Subligna.

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.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3429 8539 3429 8546 3459 8553 3459 8511
      3444 8518 3443 8522 3442 8522 3442 8524
      3440 8525 3437 8533

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 9:00 PM EDT	Special Weather Statement	FFC	Harris	30 min
Jun 19, 9:05 PM EDT	Special Weather Statement	FFC	Monroe	25 min
Jun 19, 9:21 PM EDT	Special Weather Statement	FFC	Treutlen	24 min
Jun 19, 9:32 PM EDT	Tornado Warning	FFC	Emanuel, Johnson, Laurens, Treutlen	28 min
Jun 19, 10:10 PM EDT	Special Weather Statement	FFC	Marion	35 min
Jun 19, 10:22 PM EDT	Special Weather Statement	FFC	Chattooga	38 min
Jun 19, 10:53 PM EDT	Special Weather Statement	FFC	Jefferson	37 min
Jun 19, 10:57 PM EDT	Special Weather Statement	FFC	Crawford, Taylor	48 min
Jun 19, 11:47 PM EDT	Special Weather Statement	FFC	Macon, Peach	28 min
Jun 20, 2:00 AM EDT	Special Weather Statement	FFC	Harris, Muscogee	30 min
Jun 20, 2:36 AM EDT	Special Weather Statement	FFC	Chattahoochee, Stewart	24 min
Jun 20, 3:02 AM EDT	Special Weather Statement	FFC	Chattahoochee, Marion, Stewart	28 min
Jun 20, 3:22 AM EDT	Tornado Warning	FFC	Chattahoochee, Marion, Schley, Taylor	23 min
Jun 20, 3:33 AM EDT	Special Weather Statement	FFC	Stewart	27 min
Jun 20, 3:46 AM EDT	Special Weather Statement	FFC	Taylor	29 min
Jun 20, 4:02 AM EDT	Special Weather Statement	FFC	Marion, Schley, Stewart, Webster	28 min
Jun 20, 4:12 AM EDT	Tornado Warning	FFC	Macon, Marion, Schley, Sumter, Webster	33 min
Jun 20, 5:36 AM EDT	Special Weather Statement	FFC	Dooly, Sumter	24 min
Jun 20, 6:39 AM EDT	Special Weather Statement	FFC	Hancock, Warren	36 min

Nearby

Flash Flood Warnings in Georgia, 2021 Every flash flood warning in 2021

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.