Alert archive / Georgia / Flash Flood Warnings in 2019

Flash Flood Warning 28, NWS Atlanta, GA

August 5, 2019Fulton County, Georgia

NWS Atlanta, GA issued this flash flood warning at Aug 5, 2019, 9:20 PM EDT for Fulton County, Georgia. It was in force for 5 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
Aug 5, 2019, 9:20 PM EDT (01:20 UTC)
Expired
Aug 6, 2019, 2:13 AM EDT
In force
5 hr
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Flood severity
None

County Fulton County, GA

The radar

The Atlanta radar (KFFC), 48 km from the middle of the area, began a volume at 01:20 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

TimeReportWhereRemark
Aug 5, 10:17 PM EDTFLASH FLOOD1 Sw Midtown, GASOCIAL MEDIA REPORT OF STREET FLOODING UNDER OVERPASS OF MARIETTA ST. NW OVER NORTH AVE. NW.

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, 1.3 hours before the alert went out and 46 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 2019-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 894 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 2019-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 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
894 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
1141 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
71 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.7

Open this sounding in Storm Lab

The text

As transmitted.

849 
WGUS52 KFFC 060120
FFWFFC
GAC121-060715-
/O.NEW.KFFC.FF.W.0028.190806T0120Z-190806T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Peachtree City GA
920 PM EDT Mon Aug 5 2019

The National Weather Service in Peachtree City has issued a

* Flash Flood Warning for...
  Central Fulton County in north central Georgia...

* Until 315 AM EDT.

* At 919 PM EDT, Doppler radar and automated rain gauges indicated
  thunderstorms producing heavy rain across the warned area. Flash
  flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Atlanta, East Point, Hapeville, Grant Park-Zoo Atlanta, Midtown,
  West End, Sweet Auburn, Turner Field, Piedmont Park, Bankhead,
  Cascade Heights, Lakewood Park, Bolton and Atlantic Station.

LAT...LON 3378 8453 3383 8447 3383 8446 3384 8445
      3387 8441 3375 8435 3368 8435 3366 8442

$$
1 follow-up statement
832 
WGUS72 KFFC 060613
FFSFFC

Flash Flood Statement
National Weather Service Peachtree City GA
213 AM EDT Tue Aug 6 2019

GAC121-060623-
/O.CAN.KFFC.FF.W.0028.000000T0000Z-190806T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fulton GA-
213 AM EDT Tue Aug 6 2019

...THE FLASH FLOOD WARNING FOR CENTRAL FULTON 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 3378 8453 3383 8447 3383 8446 3384 8445
      3387 8441 3375 8435 3368 8435 3366 8442

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 5, 8:54 PM EDTSpecial Weather StatementFFCClayton, Fulton36 min
Aug 6, 4:00 PM EDTSpecial Weather StatementFFCBleckley30 min
Aug 6, 4:30 PM EDTSpecial Weather StatementFFCLaurens30 min
Aug 6, 6:53 PM EDTSpecial Weather StatementFFCMacon37 min

Nearby

Flash Flood Warnings in Georgia, 2019Every flash flood warning in 2019

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.