Alert archive / Georgia / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 235, NWS Atlanta, GA

July 21, 1990Burke County, Screven County, Georgia; Allendale County, South Carolina

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 21, 1990, 6:03 PM EDT for Burke County, Screven County, Georgia; Allendale County, South Carolina. It was in force for 42 min.

The area

The counties it named.

The facts

Issued
Jul 21, 1990, 6:03 PM EDT (22:03 UTC)
Expired
Jul 21, 1990, 6:45 PM EDT
In force
42 min
Issued by
NWS Atlanta, GA
Area
Whole counties

Counties Burke County, GA, Screven County, GA, Allendale County, SC

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 10.1 hours before the alert went out and 155 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 12:00Z on 1990-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1485 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 12:00Z on 1990-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 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
1485 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
674 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
74 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 KAGS 212204
SVRAGS
GAC033-251-SCC005-212245-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUGUSTA GA
603 PM EDT SAT JUL 21 1990
 
THE NATIONAL WEATHER SERVICE IN AUGUSTA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  645 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN EAST CENTRAL GEORGIA
 
   ...SOUTHEASTERN BURKE COUNTY...NORTHEASTERN SCREVEN COUNTY
 
 
IN WEST CENTRAL SOUTH CAROLINA
 
   ...WESTERN ALLENDALE COUNTY
 
AT 600 PM EDT NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM IN EAST CENTRAL GEROGIA ALONG THE BURKE-SCREVEN COUNTY
LINE. THIS STORM IS MOVING EAST AT 15 MPH AND WILL BE MOVING INTO
WESTERN ALLENDALE COUNTY SOUTH CAROLINA.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAfVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

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, Jul 21, 2:47 PM EDT, 3 hours 16 minutes before
GAZ002-004-212245-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ATHENS GA
246 PM EDT SAT JUL 21 1990

THUNDERSTORMS INCREASING OVER THE MOUNTAIN AREAS OF NORTHEAST GEORGIA
AT THIS TIME AND ARE EXPECTED TO BECOME SCATTERED TROUGHOUT NORTHEAST
GEORGIA BY LATER TODAY.

THE LARGER STORMS COULD PRODUCE BRIEF GUSTY  WINDS WITH VERY HEAVY
DOWNPOURS AND CLOUD TO GROUND LIGHTNING.

MOVEMENT OF THE STORMS WILL BE TO THE EAST AT 10 TO 15 MPH.

SHOULD YOU NOTE ANY STORMS IN YOUR AREA SEEK SHELTER UNTIL
THEY PASS.

...REMEMBER THAT LIGHTNING IS A KILLER...

Nearby

Severe Thunderstorm Warnings in Georgia, 1990Severe Thunderstorm Warnings in South Carolina, 1990Every severe thunderstorm warning in 1990

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.