Alert archive / Georgia / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 496, NWS Atlanta, GA

July 21, 1999Cobb County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 21, 1999, 6:24 PM 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: Jul 21, 1999, 6:24 PM EDT (22:24 UTC)
Expired: Jul 21, 1999, 7:00 PM EDT
In force: 36 min
Issued by: NWS Atlanta, GA
Area: Whole counties

County Cobb County, GA

What was reported inside it

Time	Report	Where	Remark
Jul 21, 6:45 PM EDT	Thunderstorm Wind	Kennesaw, GA	The public reported trees blown down on Pine Mountain Road.

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, 10.4 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 316 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 1101 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: -13 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.

042 
WUUS1 KATL 212226 RRA
SVRATL
GAC067-212300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
624 PM EDT WED JUL 21 1999

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

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

* UNTIL 700 PM EDT

* AT 623 PM EDT... A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR  2 MILES WEST OF KENNESAW... MOVING SOUTH AT 10 MPH. AT 620
PM THE PUBLIC REPORTED TREES DOWN IN ACWORTH.

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM ARE...
   KENNESAW                    AROUND 630 PM EDT...

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

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Local storm report, Jul 21, 6:00 PM EDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
600 PM EDT WED JUL 21 1999

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

430 PM     DAWSONVILLE               GA   WIND DAMAGE
07/21/99   DAWSON                         TREES BLOWN DOWN

440 PM     3 SE JEFFERSON            GA   WIND DAMAGE
07/21/99   JACKSON                        TREES BLOWN DOWN

500 PM     8 NE CANTON               GA   WIND DAMAGE
07/21/99   CHEROKEE                       TREES BLOWN DOWN

553 PM     STOCKBRIDGE               GA   WIND DAMAGE
07/21/99   HENRY                          POWER LINES BLOWN DOWN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 3:16 PM EDT	Severe Thunderstorm Warning	FFC	Hall	34 min
Jul 21, 4:14 PM EDT	Severe Thunderstorm Warning	FFC	Dawson, Lumpkin	36 min
Jul 21, 5:25 PM EDT	Severe Thunderstorm Warning	FFC	Clayton, Henry	35 min
Jul 21, 6:05 PM EDT	Severe Thunderstorm Warning	FFC	Coweta, Fulton	35 min
Jul 21, 6:15 PM EDT	Severe Thunderstorm Warning	FFC	Fayette	35 min
Jul 21, 6:42 PM EDT	Severe Thunderstorm Warning	FFC	Coweta, Spalding	33 min

Nearby

Severe Thunderstorm Warnings in Georgia, 1999 Every 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.