Alert archive / Georgia / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 239, NWS Atlanta, GA

April 18, 1998Johnson County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Apr 18, 1998, 12:04 AM EDT for Johnson County, Georgia. It was in force for 21 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: Apr 18, 1998, 12:04 AM EDT (04:04 UTC)
Expired: Apr 18, 1998, 12:25 AM EDT
In force: 21 min
Issued by: NWS Atlanta, GA
Area: Whole counties

County Johnson County, GA

What was reported inside it

Time	Report	Where	Remark
Apr 18, 12:15 AM EDT	Thunderstorm Wind	Wrightsville, GA	The sheriff's office reported thunderstorm winds knocked trees down, some of which caused power outages as they fell on power lines.

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 00:00Z, 4.1 hours before the alert went out and 187 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: 7 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 1346 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 133 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

118 
WUUS1 KATL 180406 RRA
SVRATL
GAC167-180425-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1204 AM EDT SAT APR 18 1998

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

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

* UNTIL 1225 AM EDT

* THE SEVERE THUNDERSTORMS WILL BE NEAR...

* AT 1203 AM EDT... A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR...10 SOUTHWEST OF WRIGHTSVILLE...MOVING NORTHEAST AT 45
MPH. THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS.



WHEN THUNDERSTORMS ARE OCCURRING...LIGHTNING POSES A SERIOUS
DANGER. STAY INDOORS AND AWAY FROM WINDOWS. DO NOT USE TELEPHONES
OR ELECTRICAL APPLIANCES...UNLESS IN AN EMERGENCY. IF BOATING OR
SWIMMING...GET TO LAND QUICKLY AND FIND SHELTER. IF IN THE OPEN
FIND A LOW SPOT AWAY FROM TREES...FENCES...AND POLES. IF YOU
EXPERIENCE STORM DAMAGE TO STRUCTURES OR TREES...OR HAIL THE SIZE
OF DIMES OR LARGER...PLEASE REPORT IT TO THE NATIONAL WEATHER
SERVICE BY CALLING 770-486-8535.


TM/ML

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 8:07 PM EDT	Severe Thunderstorm Warning	FFC	Jefferson	33 min
Apr 17, 8:38 PM EDT	Severe Thunderstorm Warning	FFC	Marion, Webster	32 min
Apr 17, 9:11 PM EDT	Severe Thunderstorm Warning	FFC	Marion, Webster	49 min
Apr 17, 9:17 PM EDT	Severe Thunderstorm Warning	FFC	Schley	33 min
Apr 17, 9:41 PM EDT	Severe Thunderstorm Warning	FFC	Sumter	34 min
Apr 17, 10:07 PM EDT	Severe Thunderstorm Warning	FFC	Dooly	48 min
Apr 17, 10:51 PM EDT	Severe Thunderstorm Warning	FFC	Bleckley, Houston, Pulaski	34 min
Apr 17, 11:06 PM EDT	Tornado Warning	FFC	Bleckley	34 min
Apr 17, 11:28 PM EDT	Severe Thunderstorm Warning	FFC	Laurens	32 min
Apr 17, 11:40 PM EDT	Tornado Warning	FFC	Laurens	35 min
Apr 18, 12:00 AM EDT	Severe Thunderstorm Warning	FFC	Bleckley, Dodge, Pulaski	35 min
Apr 18, 12:23 AM EDT	Severe Thunderstorm Warning	FFC	Jefferson	17 min
Apr 18, 12:35 AM EDT	Severe Thunderstorm Warning	FFC	Emanuel	20 min
Apr 18, 7:23 PM EDT	Tornado Warning	FFC	Floyd	32 min

Nearby

Severe Thunderstorm Warnings in Georgia, 1998 Every severe thunderstorm warning in 1998

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.