Alert archive / Georgia / Flash Flood Warnings in 2018

Flash Flood Warning 21, NWS Atlanta, GA

June 13, 20184 counties in Georgia

NWS Atlanta, GA issued this flash flood warning at Jun 13, 2018, 9:40 PM EDT for 4 counties in 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
Jun 13, 2018, 9:40 PM EDT (01:40 UTC)
Expired
Jun 14, 2018, 3:45 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, Henry County, GA, Rockdale County, GA

The radar

The Atlanta radar (KFFC), 39 km from the middle of the area, began a volume at 01:44 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, 1.7 hours before the alert went out and 34 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-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 00:00Z on 2018-06-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1413 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 00:00Z on 2018-06-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1413 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1189 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
34 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

844 
WGUS52 KFFC 140140
FFWFFC
GAC063-089-151-247-140745-
/O.NEW.KFFC.FF.W.0021.180614T0140Z-180614T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
940 PM EDT WED JUN 13 2018

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Southwestern Rockdale County in north central Georgia...
  Southwestern DeKalb County in north central Georgia...
  Northern Henry County in north central Georgia...
  Northern Clayton County in north central Georgia...

* Until 345 AM EDT Thursday.

* At 940 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Flash flooding is expected to
  begin shortly.

* Some locations that will experience flooding include...
  McDonough, Jonesboro, Stockbridge, Forest Park, Riverdale, Morrow,
  Hapeville, Lake City, Lake Spivey, Rex, Richardson Park, Ellenwood,
  Hidden Valley Park, Fort Gillem, Panola Mountain State Park,
  Flippen, Conley, Kelleytown and Eagles Landing.

LAT...LON 3365 8441 3365 8435 3369 8434 3368 8413
      3353 8404 3352 8405 3352 8404 3349 8403
      3350 8402 3344 8399 3346 8426 3353 8434
      3357 8446 3362 8446

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 13, 8:21 PM EDTSpecial Weather StatementFFCHenry24 min
Jun 13, 8:45 PM EDTSpecial Weather StatementFFCHenry30 min
Jun 13, 9:12 PM EDTSpecial Weather StatementFFCClayton33 min
Jun 13, 9:24 PM EDTSpecial Weather StatementFFCHenry36 min
Jun 14, 2:46 AM EDTSpecial Weather StatementFFCHouston, Twiggs44 min
Jun 14, 1:29 PM EDTSpecial Weather StatementFFCBibb31 min
Jun 14, 2:38 PM EDTSpecial Weather StatementFFCToombs52 min
Jun 14, 2:41 PM EDTSpecial Weather StatementFFCLaurens34 min
Jun 14, 3:11 PM EDTSpecial Weather StatementFFCLaurens34 min
Jun 14, 3:27 PM EDTSpecial Weather StatementFFCMontgomery33 min
Jun 14, 3:28 PM EDTSpecial Weather StatementFFCToombs32 min
Jun 14, 4:03 PM EDTSpecial Weather StatementFFCToombs12 min
Jun 14, 4:10 PM EDTSpecial Weather StatementFFCMontgomery35 min
Jun 14, 4:16 PM EDTSpecial Weather StatementFFCToombs29 min
Jun 14, 4:33 PM EDTSevere Thunderstorm WarningFFCMontgomery, Wheeler42 min
Jun 14, 5:07 PM EDTSevere Thunderstorm WarningFFCTelfair, Wheeler38 min
Jun 14, 5:23 PM EDTSpecial Weather StatementFFCEmanuel37 min
Jun 14, 5:41 PM EDTSpecial Weather StatementFFCDodge34 min
Jun 14, 5:57 PM EDTSpecial Weather StatementFFCEmanuel33 min
Jun 14, 5:59 PM EDTSpecial Weather StatementFFCHall31 min
Jun 14, 6:13 PM EDTSpecial Weather StatementFFCTelfair32 min
Jun 14, 6:27 PM EDTSpecial Weather StatementFFCHall33 min
Jun 14, 6:45 PM EDTSpecial Weather StatementFFCHeard30 min
Jun 14, 6:57 PM EDTSpecial Weather StatementFFCLumpkin33 min
Jun 14, 7:07 PM EDTSpecial Weather StatementFFCTaylor38 min
Jun 14, 7:14 PM EDTSpecial Weather StatementFFCHeard31 min
Jun 14, 7:19 PM EDTSpecial Weather StatementFFCCrawford26 min
Jun 14, 7:22 PM EDTSevere Thunderstorm WarningFFCBibb, Crawford, Monroe19 min
Jun 14, 7:27 PM EDTSpecial Weather StatementFFCUpson33 min
Jun 14, 7:34 PM EDTSpecial Weather StatementFFCBibb26 min
Jun 14, 7:57 PM EDTSpecial Weather StatementFFCBibb33 min

Nearby

Flash Flood Warnings in Georgia, 2018Every flash flood warning in 2018

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.