Alert archive / Georgia / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 687, NWS Atlanta, GA
NWS Atlanta, GA issued this severe thunderstorm warning at Sep 21, 1999, 3:02 PM EDT for Clayton County, Fulton County, Georgia. It was in force for 33 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
- Sep 21, 1999, 3:02 PM EDT (19:02 UTC)
- Expired
- Sep 21, 1999, 3:35 PM EDT
- In force
- 33 min
- Issued by
- NWS Atlanta, GA
- Area
- Whole counties
Counties Clayton County, GA, Fulton County, GA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 21, 3:10 PM EDT | Hail 0.75 | College Park, GA | The public reported dime size hail at a Hartsfield Airport parking lot. Another citizen reported numerous limbs down and power outages in Union City. |
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, 7.0 hours before the alert went out and 34 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
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, 2 hours 4 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, 2 hours 4 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, 37 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, 30 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, 22 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, 17 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, 2:57 PM EDT | Severe Thunderstorm Warning | FFC | Gwinnett | 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.