Alert archive / Georgia / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 686, NWS Atlanta, GA
NWS Atlanta, GA issued this severe thunderstorm warning at Sep 21, 1999, 2:57 PM EDT for Gwinnett 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
- Sep 21, 1999, 2:57 PM EDT (18:57 UTC)
- Expired
- Sep 21, 1999, 3:30 PM EDT
- In force
- 33 min
- Issued by
- NWS Atlanta, GA
- Area
- Whole counties
County Gwinnett County, GA
The nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 7.0 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.
- Mixed-layer CAPE
- 230 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 557 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- -11 m²/s²
- 0-3 km storm-relative helicity
- 42 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KATL 211859 RRA SVRATL GAC135-211930- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PEACHTREE CITY GA 257 PM EDT TUE SEP 21 1999 THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... GWINNETT COUNTY IN NORTHWESTERN GEORGIA * UNTIL 330 PM EDT. * AT 256 PM EDT... PUBLIC REPORTED TREES DOWN NEAR NORCROSS. THIS STORM WAS MOVING SOUTHEAST AT 25 MPH. * SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM ARE... LILBURN... LAWRENCEVILLE... SNELLVILLE... GRAYSON... DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. IF YOU SEE DAMAGE OR LARGE HAIL...CAL>L 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
Special weather statement, Sep 21, 12:58 PM EDT, 1 hour 59 minutes before
GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086- 091>098-103>113-211900- NORTH AND CENTRAL GEORGIA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE PEACHTREE CITY GA 1258 PM EDT TUE SEP 21 1999 A FEW SEVERE THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON OVER NORTH GEORGIA. THIS INCLUDES THE ATLANTA AND ATHENS AREAS AND LOCATIONS NORTH. A LINE OF STRONG THUNDERSTORMS...AHEAD OF A COLD FRONT IN NORTHWEST GEORGIA EARLY THIS AFTERNOON...WILL MOVE EAST AT 10 TO 15 MILES PER HOUR. THE ATMOSPHERE OVER NORTH GEORGIA WILL BECOME INCREASINGLY UNSTABLE DURING THE AFTERNOON AS COLD AIR ALOFT MOVES OVER THE WARM MOIST AIR NEAR THE SURFACE. AS A RESULT...A FEW THUNDERSTORMS COULD PRODUCE LARGE HAIL EQUAL TO OR GREATER THAN DIME SIZE. SPOTTERS AND EMERGENCY MANAGERS IN NORTH GEORGIA SHOULD BE PREPARED FOR POSSIBLE ACTIVATION.
Special weather statement, Sep 21, 12:58 PM EDT, 1 hour 59 minutes before
GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086- 091>098-103>113-211900- NORTH AND CENTRAL GEORGIA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE PEACHTREE CITY GA 1258 PM EDT TUE SEP 21 1999 A FEW SEVERE THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON OVER NORTH GEORGIA. THIS INCLUDES THE ATLANTA AND ATHENS AREAS AND LOCATIONS NORTH. A LINE OF STRONG THUNDERSTORMS...AHEAD OF A COLD FRONT IN NORTHWEST GEORGIA EARLY THIS AFTERNOON...WILL MOVE EAST AT 10 TO 15 MILES PER HOUR. THE ATMOSPHERE OVER NORTH GEORGIA WILL BECOME INCREASINGLY UNSTABLE DURING THE AFTERNOON AS COLD AIR ALOFT MOVES OVER THE WARM MOIST AIR NEAR THE SURFACE. AS A RESULT...A FEW THUNDERSTORMS COULD PRODUCE LARGE HAIL EQUAL TO OR GREATER THAN DIME SIZE. SPOTTERS AND EMERGENCY MANAGERS IN NORTH GEORGIA SHOULD BE PREPARED FOR POSSIBLE ACTIVATION.
Local storm report, Sep 21, 2:25 PM EDT, 32 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
225 PM EDT TUE SEP 21 1999
TIME(EDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
210 PM MARIETTA GA 1.00 INCH HAIL
09/21/99 COBB OFF-DUTY CNN METEOROLOGIST
REPORTED 1-INCH HAIL
COVERING THE GROUND AND GUST
TO 78 MPH WITH HAND-HELD
ANEMOMETERLocal storm report, Sep 21, 2:32 PM EDT, 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
232 PM EDT TUE SEP 21 1999
TIME(EDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
210 PM MARIETTA GA 1.00 INCH HAIL
09/21/99 COBB OFF-DUTY CNN METEOROLOGIST
REPORTED 1-INCH HAIL
COVERING THE GROUND AND GUST
TO 78 MPH WITH HAND-HELD
ANEMOMETER
215 PM KENNESAW GA 0.75 INCH HAIL
09/21/99 COBBLocal storm report, Sep 21, 2:40 PM EDT, 17 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
240 PM EDT TUE SEP 21 1999
TIME(EDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
210 PM MARIETTA GA 1.00 INCH HAIL
09/21/99 COBB OFF-DUTY CNN METEOROLOGIST
REPORTED 1-INCH HAIL
COVERING THE GROUND AND GUST
TO 78 MPH WITH HAND-HELD
ANEMOMETER
215 PM KENNESAW GA 0.75 INCH HAIL
09/21/99 COBB
230 PM SANDY SPRINGS GA 1.25 INCH HAIL
09/21/99 FULTON COVERING THE GROUNDLocal storm report, Sep 21, 2:45 PM EDT, 12 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
245 PM EDT TUE SEP 21 1999
TIME(EDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
210 PM MARIETTA GA 1.00 INCH HAIL
09/21/99 COBB OFF-DUTY CNN METEOROLOGIST
REPORTED 1-INCH HAIL
COVERING THE GROUND AND GUST
TO 78 MPH WITH HAND-HELD
ANEMOMETER
215 PM KENNESAW GA 0.75 INCH HAIL
09/21/99 COBB
230 PM SANDY SPRINGS GA 1.25 INCH HAIL
09/21/99 FULTON COVERING THE GROUND
240 PM DUNWOODY GA 0.75 INCH HAIL
09/21/99 DEKALBThe office that day
Everything else NWS Atlanta, GA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 2:17 PM EDT | Severe Thunderstorm Warning | FFC | Cobb | 33 min |
| Sep 21, 2:31 PM EDT | Severe Thunderstorm Warning | FFC | DeKalb, Fulton | 34 min |
| Sep 21, 3:02 PM EDT | Severe Thunderstorm Warning | FFC | Clayton, Fulton | 33 min |
| Sep 21, 3:21 PM EDT | Severe Thunderstorm Warning | FFC | Barrow, Hall, Jackson | 34 min |
| Sep 21, 3:30 PM EDT | Severe Thunderstorm Warning | FFC | Fayette | 35 min |
| Sep 21, 3:33 PM EDT | Severe Thunderstorm Warning | FFC | Walton | 37 min |
| Sep 21, 4:03 PM EDT | Severe Thunderstorm Warning | FFC | Jasper, Newton | 32 min |
| Sep 21, 4:24 PM EDT | Severe Thunderstorm Warning | FFC | Clarke, Oconee | 36 min |
| Sep 21, 4:53 PM EDT | Severe Thunderstorm Warning | FFC | Putnam | 32 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.