Alert archive / Georgia / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 21, NWS Atlanta, GA

January 23, 1999Clayton County, Fulton County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jan 23, 1999, 6:11 AM EST for Clayton County, Fulton County, Georgia. It was in force for 34 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: Jan 23, 1999, 6:11 AM EST (11:11 UTC)
Expired: Jan 23, 1999, 6:45 AM EST
In force: 34 min
Issued by: NWS Atlanta, GA
Area: Whole counties

Counties Clayton County, GA, Fulton County, GA

The radar

The Atlanta radar (KFFC), 37 km from the middle of the area, began a volume at 11:11 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 11.2 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.

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: 30 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1257 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 166 m²/s²
0-3 km storm-relative helicity: 333 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 231111 RRA
SVRATL
GAC063-121-231145-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
611 AM EST SAT JAN 23 1999

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLAYTON COUNTY IN NORTHWESTERN GEORGIA
  FULTON COUNTY IN NORTHWESTERN GEORGIA

* UNTIL 645 AM EST

* AT 610 AM EST... A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR  11 MILES SOUTHWEST OF LAKEWOOD PARK... MOVING NORTHEAST AT
  55 MPH.

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM ARE...
   CONLEY                      AROUND 620 AM EST
   LAKEWOOD PARK               AROUND 620 AM EST
   ATLANTA                     AROUND 620 AM EST
   SANDY SPRINGS               AROUND 630 AM EST
   ALPHARETTA                  AROUND 645 AM EST

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
DESTRUCTIVE HAIL AND DEADLY LIGHTNING. FOR YOUR PROTECTION MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. IF
YOU SEE DAMAGE OR LARGE HAIL...CALL THE NATIONAL WEATHER SERVICE
AT 770.486.1133 EXTENSION 204.

$$ KDF/BDL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 23, 4:59 AM EST	Severe Thunderstorm Warning	FFC	Haralson	31 min
Jan 23, 5:49 AM EST	Severe Thunderstorm Warning	FFC	Coweta	36 min
Jan 23, 10:32 AM EST	Severe Thunderstorm Warning	FFC	Wilcox	33 min
Jan 23, 11:43 AM EST	Severe Thunderstorm Warning	FFC	Laurens	32 min
Jan 23, 12:35 PM EST	Severe Thunderstorm Warning	FFC	Montgomery	35 min
Jan 23, 12:57 PM EST	Severe Thunderstorm Warning	FFC	Emanuel, Toombs, Treutlen	48 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.