Alert archive / Georgia / Flash Flood Warnings in 2021

Flash Flood Warning 14, NWS Atlanta, GA

July 19, 2021Clayton County, DeKalb County, Fulton County, Georgia

NWS Atlanta, GA issued this flash flood warning at Jul 19, 2021, 10:13 PM EDT for Clayton County, DeKalb County, Fulton County, Georgia. It was in force for 6 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: Jul 19, 2021, 10:13 PM EDT (02:13 UTC)
Expired: Jul 20, 2021, 4:15 AM EDT
In force: 6 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

Counties Clayton County, GA, DeKalb County, GA, Fulton County, GA

The radar

The Atlanta radar (KFFC), 35 km from the middle of the area, began a volume at 02:12 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
Jul 19, 10:15 PM EDT	FLASH FLOOD	1 Wsw Gresham Park, GA	FLOODING OF INTRENCHMENT CREEK ALONG CONSTITUTION ROAD RESULTED IN A WATER RESCUE OF A PERSON IN A VEHICLE. WATER WAS REPORTED TO BE AT THE BOTTOM OF THE DOOR OF THE VEHICLE AT TIME OF RESCUE. TIME ESTIMATED FROM EM REPORT.

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, 2.2 hours before the alert went out and 31 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: 569 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 673 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

638 
WGUS52 KFFC 200213
FFWFFC
GAC063-089-121-200815-
/O.NEW.KFFC.FF.W.0014.210720T0213Z-210720T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
1013 PM EDT Mon Jul 19 2021

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Clayton County in north central Georgia...
  Southwestern DeKalb County in north central Georgia...
  South Central Fulton County in north central Georgia...

* Until 415 AM EDT Tuesday.

* At 1013 PM EDT, emergency management reported thunderstorms 
  producing heavy rain across the warned area. Between 2 and 4.5 
  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...Emergency management reported.

  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...
  Atlanta, Decatur, Jonesboro, East Point, Stockbridge, Forest Park, 
  Riverdale, College Park, Clarkston, Morrow, Hapeville, Stone 
  Mountain, Avondale Estates, Lake City, Pine Lake, Grant Park-Zoo 
  Atlanta, Candler-Mcafee, Belvedere Park, Druid Hills and 
  Hartsfield-Jackson Airport.

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.

Be aware of your surroundings and do not drive on flooded roads.

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 3362 8452 3380 8443 3386 8418 3382 8412
      3375 8414 3365 8427 3365 8428 3364 8428
      3355 8429 3353 8429 3350 8429 3347 8438
      3348 8439 3349 8441 3352 8443 3355 8444
      3355 8446

FLASH FLOOD...OBSERVED

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 9:37 PM EDT	Special Weather Statement	FFC	Coweta	53 min
Jul 19, 10:07 PM EDT	Flash Flood Warning	FFC	Coweta, Heard, Troup	6 hr
Jul 19, 10:22 PM EDT	River Flood Warning	FFC	DeKalb	4 hr
Jul 19, 10:31 PM EDT	River Flood Warning	FFC	DeKalb	2 hr
Jul 19, 11:09 PM EDT	River Flood Warning	FFC	DeKalb	98 min
Jul 20, 3:21 AM EDT	Flash Flood Watch	FFC	Banks, Barrow, Bartow, Carroll, Catoosa, Chattooga and 39 more	19 hr
Jul 20, 1:45 PM EDT	Special Weather Statement	FFC	Hancock	30 min
Jul 20, 3:54 PM EDT	Special Weather Statement	FFC	Newton	36 min
Jul 20, 4:22 PM EDT	Special Weather Statement	FFC	Morgan	23 min
Jul 20, 5:01 PM EDT	Special Weather Statement	FFC	Wilkes	44 min
Jul 20, 5:40 PM EDT	Special Weather Statement	FFC	Meriwether, Troup	35 min
Jul 20, 5:55 PM EDT	Special Weather Statement	FFC	Bibb	35 min
Jul 20, 7:17 PM EDT	Flash Flood Warning	FFC	Carroll, Haralson	6 hr
Jul 20, 7:41 PM EDT	Special Weather Statement	FFC	Lamar, Pike	49 min
Jul 20, 7:57 PM EDT	Special Weather Statement	FFC	Johnson	48 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.