Alert archive / Georgia / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 498, NWS Atlanta, GA

July 21, 1999Jefferson County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 21, 1999, 8:05 PM EDT for Jefferson County, Georgia. It was in force for 35 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 21, 1999, 8:05 PM EDT (00:05 UTC)
Expired
Jul 21, 1999, 8:40 PM EDT
In force
35 min
Issued by
NWS Atlanta, GA
Area
Whole counties

County Jefferson County, GA

The radar

The Robins AFB radar (KJGX), 97 km from the middle of the area, began a volume at 00:06 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 0.1 hours before the alert went out and 226 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, Charleston AFB, SC at 00:00Z on 1999-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3769 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, Charleston AFB, SC at 00:00Z on 1999-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 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
3769 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
822 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
78 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KATL 220006 RRA
SVRATL
GAC163-220040-

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

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JEFFERSON COUNTY IN EAST CENTRAL GEORGIA

* UNTIL 840 PM EDT

* AT 804 PM EDT... A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR  4 MILES NORTHEAST OF STAPLETON... MOVING SOUTH AT 10 MPH.

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM ARE...
   STAPLETON                   AROUND 825 PM EDT...
   AVERA                       AROUND 825 PM EDT...

DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN AND DEADLY LIGHTNING
ARE ALL POSSNIBLE 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, 2 hours 5 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
Local storm report, Jul 21, 7:17 PM EDT, 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
717 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

614 PM     FAYETTEVILLE              GA   0.75 INCH HAIL
07/21/99   FAYETTE

620 PM     ACWORTH                   GA   WIND DAMAGE
07/21/99   COBB                           TREES BLOWN DOWN

640 PM     PEACHTREE CITY            GA   WIND DAMAGE
07/21/99   FAYETTE                        TREES BLOWN DOWN

645 PM     PEACHTREE CITY            GA   0.75 INCH HAIL
07/21/99   FAYETTE

645 PM     KENNESAW                  GA   WIND DAMAGE
07/21/99   COBB                           TREES BLOWN DOWN
Local storm report, Jul 21, 7:30 PM EDT, 35 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
730 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

614 PM     10 N FAYETTEVILLE         GA   0.75 INCH HAIL
07/21/99   FAYETTE

620 PM     ACWORTH                   GA   WIND DAMAGE
07/21/99   COBB                           TREES BLOWN DOWN

640 PM     PEACHTREE CITY            GA   WIND DAMAGE
07/21/99   FAYETTE                        TREES BLOWN DOWN

645 PM     PEACHTREE CITY            GA   0.75 INCH HAIL
07/21/99   FAYETTE

645 PM     KENNESAW                  GA   WIND DAMAGE
07/21/99   COBB                           TREES BLOWN DOWN
Local storm report, Jul 21, 7:30 PM EDT, 35 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
730 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

614 PM     10 N FAYETTEVILLE         GA   0.75 INCH HAIL
07/21/99   FAYETTE

620 PM     ACWORTH                   GA   WIND DAMAGE
07/21/99   COBB                           TREES BLOWN DOWN

640 PM     PEACHTREE CITY            GA   WIND DAMAGE
07/21/99   FAYETTE                        TREES BLOWN DOWN

645 PM     PEACHTREE CITY            GA   0.75 INCH HAIL
07/21/99   FAYETTE

645 PM     KENNESAW                  GA   WIND DAMAGE
07/21/99   COBB                           TREES BLOWN DOWN
Local storm report, Jul 21, 7:32 PM EDT, 33 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
732 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

614 PM     10 N PEACHTREE CITY       GA   0.75 INCH HAIL
07/21/99   FAYETTE

620 PM     ACWORTH                   GA   WIND DAMAGE
07/21/99   COBB                           TREES BLOWN DOWN

640 PM     PEACHTREE CITY            GA   WIND DAMAGE
07/21/99   FAYETTE                        TREES BLOWN DOWN

645 PM     PEACHTREE CITY            GA   0.75 INCH HAIL
07/21/99   FAYETTE

645 PM     KENNESAW                  GA   WIND DAMAGE
07/21/99   COBB                           TREES BLOWN DOWN
Local storm report, Jul 21, 7:32 PM EDT, 33 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
732 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

614 PM     10 N PEACHTREE CITY       GA   0.75 INCH HAIL
07/21/99   FAYETTE

620 PM     ACWORTH                   GA   WIND DAMAGE
07/21/99   COBB                           TREES BLOWN DOWN

640 PM     PEACHTREE CITY            GA   WIND DAMAGE
07/21/99   FAYETTE                        TREES BLOWN DOWN

645 PM     PEACHTREE CITY            GA   0.75 INCH HAIL
07/21/99   FAYETTE

645 PM     KENNESAW                  GA   WIND DAMAGE
07/21/99   COBB                           TREES BLOWN DOWN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 22, 4:02 PM EDTSevere Thunderstorm WarningFFCLumpkin, Union, White33 min
Jul 22, 4:25 PM EDTSevere Thunderstorm WarningFFCNewton, Rockdale20 min
Jul 22, 4:33 PM EDTSevere Thunderstorm WarningFFCLumpkin32 min
Jul 22, 5:12 PM EDTSevere Thunderstorm WarningFFCDawson33 min
Jul 22, 6:20 PM EDTSevere Thunderstorm WarningFFCCobb35 min
Jul 22, 7:01 PM EDTSevere Thunderstorm WarningFFCSumter34 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; radar from the NEXRAD Level II archive.