Alert archive / Georgia / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 521, NWS Atlanta, GA

July 24, 1999Gwinnett County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 24, 1999, 4:32 PM EDT for Gwinnett County, Georgia. It was in force for 48 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 24, 1999, 4:32 PM EDT (20:32 UTC)
Expired
Jul 24, 1999, 5:20 PM EDT
In force
48 min
Issued by
NWS Atlanta, GA
Area
Whole counties

County Gwinnett County, GA

What was reported inside it

TimeReportWhereRemark
Jul 24, 4:32 PM EDTThunderstorm WindCenterville, GAA spotter reported trees down and street flooding.
Jul 24, 4:40 PM EDTHail 0.75Snellville, GA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.5 hours before the alert went out and 79 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 12:00Z on 1999-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1875 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 1999-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 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
1875 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
1103 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
-17 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KATL 242033 RRA
SVRATL
GAC135-242120-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
432 PM EDT SAT JUL 24 1999

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GWINNETT COUNTY IN NORTHWESTERN GEORGIA

* UNTIL 520 PM EDT

* AT 432 PM EDT... A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR  5 MILES WEST OF SNELLVILLE... MOVING EAST AT 5 MPH.

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM ARE...
   SNELLVILLE                  AROUND 525 PM EDT...

DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN AND DEADLY LIGHTNING
ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. IF YOU SEE DAMAGE OR
LARGE HA^IL...CALL THE NATIONAL WEATHER SERVICE AT 770-486-1133 AT
EXTENSION 2 0 4.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 9:00 PM EDTSevere Thunderstorm WarningFFCCrisp20 min
Jul 23, 9:08 PM EDTSevere Thunderstorm WarningFFCWilcox17 min
Jul 23, 9:15 PM EDTSevere Thunderstorm WarningFFCDodge35 min
Jul 23, 9:22 PM EDTSevere Thunderstorm WarningFFCCrisp18 min
Jul 24, 2:56 PM EDTSevere Thunderstorm WarningFFCWhitfield34 min
Jul 24, 3:01 PM EDTSevere Thunderstorm WarningFFCHarris, Troup34 min
Jul 24, 3:30 PM EDTSevere Thunderstorm WarningFFCForsyth, Fulton, Gwinnett35 min
Jul 24, 3:47 PM EDTSevere Thunderstorm WarningFFCCobb33 min
Jul 24, 3:56 PM EDTSevere Thunderstorm WarningFFCPolk34 min
Jul 24, 4:04 PM EDTSevere Thunderstorm WarningFFCBartow31 min
Jul 24, 4:09 PM EDTSevere Thunderstorm WarningFFCFulton36 min
Jul 24, 4:18 PM EDTSevere Thunderstorm WarningFFCCobb32 min
Jul 24, 4:25 PM EDTSevere Thunderstorm WarningFFCPolk50 min
Jul 24, 4:29 PM EDTSevere Thunderstorm WarningFFCGreene, Oconee36 min
Jul 24, 4:34 PM EDTSevere Thunderstorm WarningFFCForsyth51 min
Jul 24, 4:37 PM EDTSevere Thunderstorm WarningFFCHeard48 min
Jul 24, 4:39 PM EDTSevere Thunderstorm WarningFFCFayette36 min
Jul 24, 4:44 PM EDTSevere Thunderstorm WarningFFCOglethorpe51 min
Jul 24, 4:59 PM EDTSevere Thunderstorm WarningFFCClarke46 min
Jul 24, 5:02 PM EDTSevere Thunderstorm WarningFFCClayton48 min
Jul 24, 5:06 PM EDTSevere Thunderstorm WarningFFCForsyth, Fulton49 min
Jul 24, 5:10 PM EDTSevere Thunderstorm WarningFFCNewton50 min
Jul 24, 5:12 PM EDTSevere Thunderstorm WarningFFCCarroll48 min
Jul 24, 5:16 PM EDTSevere Thunderstorm WarningFFCCoweta49 min
Jul 24, 5:20 PM EDTSevere Thunderstorm WarningFFCHenry50 min
Jul 24, 5:21 PM EDTSevere Thunderstorm WarningFFCRockdale49 min
Jul 24, 5:29 PM EDTSevere Thunderstorm WarningFFCDeKalb31 min
Jul 24, 5:42 PM EDTSevere Thunderstorm WarningFFCFulton48 min
Jul 24, 5:51 PM EDTSevere Thunderstorm WarningFFCButts49 min
Jul 24, 5:53 PM EDTSevere Thunderstorm WarningFFCFayette47 min
Jul 24, 6:02 PM EDTSevere Thunderstorm WarningFFCNewton, Rockdale48 min
Jul 24, 6:11 PM EDTSevere Thunderstorm WarningFFCMonroe49 min
Jul 24, 6:18 PM EDTSevere Thunderstorm WarningFFCClayton47 min
Jul 24, 6:21 PM EDTSevere Thunderstorm WarningFFCJasper49 min
Jul 24, 6:23 PM EDTSevere Thunderstorm WarningFFCGreene47 min
Jul 24, 6:32 PM EDTSevere Thunderstorm WarningFFCMorgan48 min
Jul 24, 6:44 PM EDTSevere Thunderstorm WarningFFCButts36 min

Nearby

Severe Thunderstorm Warnings in Georgia, 1999Every severe thunderstorm warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.