Alert archive / Georgia / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 113, NWS Atlanta, GA

May 6, 1999Cobb County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at May 6, 1999, 7:44 AM EDT for Cobb County, Georgia. It was in force for 36 min. 1 report 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
May 6, 1999, 7:44 AM EDT (11:44 UTC)
Expired
May 6, 1999, 8:20 AM EDT
In force
36 min
Issued by
NWS Atlanta, GA
Area
Whole counties

County Cobb County, GA

What was reported inside it

TimeReportWhereRemark
May 6, 7:47 AM EDTHail 1Mableton, GASeveral public reports indicated dime to quarter size hall fell across Cobb county.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 6, 6:45 AM EDTTornado WatchSPC5 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 11.7 hours before the alert went out and 64 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 1999-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 645 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 00:00Z on 1999-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 280 square meters per square second.193958Sfc1 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
645 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
702 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
280 m²/s²
0-3 km storm-relative helicity
335 m²/s²
Significant tornado parameter
1.0
Supercell composite
9.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KATL 061144 RRA
SVRATL
GAC067-061220-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
744 AM EDT THU MAY 6 1999

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

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

* UNTIL 820 AM EDT

* AT 743 AM EDT... A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR  2 MILES NORTH OF MABLETON... MOVING NORTHEAST AT 50 MPH.

* THIS WILL TAKE THE STORM ACROSS SMYRNA AND MARIETTA BEFORE 800 AM.

A TORNADO WATCH IS ALSO IN EFFECT IN OR NEAR THE WARNED AREA.
SEVERE THUNDERSTORMS OCCASIONALLY PRODUCE TORNADOES WITH LITTLE OR
NO ADVANCE WARNING. BE ALERT...BUT REMAIN CALM. IF YOU dSEE DAMAGE
OR LARGE HAIL...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
May 5, 11:47 PM EDTSevere Thunderstorm WarningFFCCoweta, Fayette33 min
May 5, 11:51 PM EDTSevere Thunderstorm WarningFFCHall49 min
May 6, 12:09 AM EDTSevere Thunderstorm WarningFFCDeKalb, Gwinnett36 min
May 6, 12:44 AM EDTSevere Thunderstorm WarningFFCDade31 min
May 6, 1:15 AM EDTSevere Thunderstorm WarningFFCDade, Walker50 min
May 6, 2:15 AM EDTSevere Thunderstorm WarningFFCWalker35 min
May 6, 2:20 AM EDTSevere Thunderstorm WarningFFCCatoosa, Whitfield35 min
May 6, 3:10 AM EDTSevere Thunderstorm WarningFFCMurray35 min
May 6, 3:29 AM EDTSevere Thunderstorm WarningFFCFannin, Gilmer46 min
May 6, 4:13 AM EDTSevere Thunderstorm WarningFFCFannin, Union32 min
May 6, 4:13 AM EDTSevere Thunderstorm WarningFFCGilmer32 min
May 6, 7:00 AM EDTSevere Thunderstorm WarningFFCPaulding35 min
May 6, 7:06 AM EDTSevere Thunderstorm WarningFFCCarroll, Haralson34 min
May 6, 7:36 AM EDTSevere Thunderstorm WarningFFCPaulding14 min
May 6, 7:38 AM EDTSevere Thunderstorm WarningFFCCarroll32 min
May 6, 7:49 AM EDTSevere Thunderstorm WarningFFCDouglas36 min
May 6, 8:20 AM EDTSevere Thunderstorm WarningFFCFulton45 min
May 6, 8:42 AM EDTSevere Thunderstorm WarningFFCCobb28 min
May 6, 8:44 AM EDTSevere Thunderstorm WarningFFCDeKalb36 min
May 6, 8:55 AM EDTSevere Thunderstorm WarningFFCGwinnett45 min
May 6, 9:04 AM EDTTornado WarningFFCGwinnett31 min
May 6, 9:26 AM EDTSevere Thunderstorm WarningFFCBarrow34 min
May 6, 9:29 AM EDTSevere Thunderstorm WarningFFCCoweta36 min
May 6, 9:42 AM EDTSevere Thunderstorm WarningFFCHeard, Troup33 min
May 6, 11:06 AM EDTSevere Thunderstorm WarningFFCHarris34 min
May 6, 11:29 AM EDTSevere Thunderstorm WarningFFCTalbot31 min
May 6, 1:19 PM EDTSevere Thunderstorm WarningFFCTaliaferro31 min
May 6, 1:37 PM EDTSevere Thunderstorm WarningFFCWarren, Wilkes28 min
May 6, 2:59 PM EDTSevere Thunderstorm WarningFFCCrisp36 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.