Alert archive / Georgia / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 470, NWS Atlanta, GA

July 7, 1999Forsyth County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 7, 1999, 5:52 PM EDT for Forsyth County, Georgia. It was in force for 33 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 7, 1999, 5:52 PM EDT (21:52 UTC)
Expired
Jul 7, 1999, 6:25 PM EDT
In force
33 min
Issued by
NWS Atlanta, GA
Area
Whole counties

County Forsyth County, GA

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 9.9 hours before the alert went out and 101 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 1999-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1999-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1082 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
45 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 072153 RRA
SVRATL
GAC117-072225-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
552 PM EDT WED JUL 7 1999

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN FORSYTH COUNTY IN NORTHWESTERN GEORGIA

* UNTIL 625 PM EDT

* AT 549 PM EDT... A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR 5 MILES SOUTHWEST OF CUMMING... MOVING SOUTHWEST AT 5 MPH.

* THIS STORM WILL AFFECT BIG CREEK AND THE SOUTHWEST PART OF
  FORSYTH COUNTY DURING THE NEXT 30 MINUTES.

DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN AND DEADLY LIGHTNING
ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. IF YOU SEE DAMAGEH 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 6, 8:12 PM EDTSevere Thunderstorm WarningFFCCrisp, Wilcox33 min
Jul 6, 8:13 PM EDTSevere Thunderstorm WarningFFCHeard32 min
Jul 6, 8:46 PM EDTFlash Flood WarningFFCHeard3 hr
Jul 7, 3:58 PM EDTSevere Thunderstorm WarningFFCFannin32 min
Jul 7, 5:38 PM EDTSevere Thunderstorm WarningFFCHaralson32 min
Jul 7, 6:02 PM EDTSevere Thunderstorm WarningFFCDouglas, Paulding33 min
Jul 7, 6:09 PM EDTSevere Thunderstorm WarningFFCCobb31 min
Jul 7, 7:27 PM EDTSevere Thunderstorm WarningFFCHeard33 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; the sounding from the Mesonet's radiosonde archive.