Alert archive / Georgia / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 479, NWS Atlanta, GA

July 11, 1999Jasper County, Newton County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 11, 1999, 3:31 PM EDT for Jasper County, Newton County, Georgia. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 11, 1999, 3:31 PM EDT (19:31 UTC)
Expired
Jul 11, 1999, 4:05 PM EDT
In force
34 min
Issued by
NWS Atlanta, GA
Area
Whole counties

Counties Jasper County, GA, Newton County, GA

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 7.5 hours before the alert went out and 68 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 1999-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 484 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 1999-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 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
484 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
771 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
48 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.

018 
WUUS1 KATL 111933
SVRATL
GAC159-217-112005-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
331 PM EDT SUN JUL 11 1999

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JASPER COUNTY IN NORTHEASTERN GEORGIA
  SOUTHERN NEWTON COUNTY IN NORTHEASTERN GEORGIA

* UNTIL 405 PM EDT

* AT 330 PM EDT... A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR  6 MILES SOUTHWEST OF NEWBORN... MOVING EAST AT 25 MPH.

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM ARE...
   NEWBORN                     AROUND 340 PM EDT...
   FARRAR                      AROUND 345 PM EDT...

BOATERS...GOLFERS AND OTHERS INVOLVED IN OUTSIDE ACTIVITIES SHOULD
SEEK SHELTER IMMEDIATELY. IF CAUGHT IN THE OPEN...FIND A LOW SPOT
AWAY FROM TREES...FENCES AND POLES. IF YOU SEE 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
Jul 11, 5:09 PM EDTSevere Thunderstorm WarningFFCMeriwether36 min
Jul 11, 5:48 PM EDTSevere Thunderstorm WarningFFCEmanuel32 min
Jul 11, 5:50 PM EDTFlash Flood WarningFFCFannin3 hr

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; the sounding from the Mesonet's radiosonde archive.