Alert archive / Georgia / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 20, NWS Atlanta, GA

January 23, 1999Coweta County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jan 23, 1999, 5:49 AM EST for Coweta County, Georgia. It was in force for 36 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, 5:49 AM EST (10:49 UTC)
Expired
Jan 23, 1999, 6:25 AM EST
In force
36 min
Issued by
NWS Atlanta, GA
Area
Whole counties

County Coweta County, GA

The radar

The Atlanta radar (KFFC), 18 km from the middle of the area, began a volume at 10:51 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, 10.8 hours before the alert went out and 24 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, Peachtre/Fal Fld, GA at 00:00Z on 1999-01-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 30 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, Peachtre/Fal Fld, GA at 00:00Z on 1999-01-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 166 square meters per square second.19395878Sfc1 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
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 231049 RRA
SVRATL
GAC077-231125-

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

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

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

* UNTIL 625 AM EST

* AT 549 AM EST... A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR  1 MILE WEST OF MADRAS... MOVING NORTHEAST AT 45 MPH.

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.

IssuedProductOfficeCountiesLasted
Jan 23, 4:59 AM ESTSevere Thunderstorm WarningFFCHaralson31 min
Jan 23, 6:11 AM ESTSevere Thunderstorm WarningFFCClayton, Fulton34 min
Jan 23, 10:32 AM ESTSevere Thunderstorm WarningFFCWilcox33 min
Jan 23, 11:43 AM ESTSevere Thunderstorm WarningFFCLaurens32 min
Jan 23, 12:35 PM ESTSevere Thunderstorm WarningFFCMontgomery35 min
Jan 23, 12:57 PM ESTSevere Thunderstorm WarningFFCEmanuel, Toombs, Treutlen48 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.