Alert archive / Mississippi / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 98, NWS Jackson, MS

May 12, 1990Covington County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at May 12, 1990, 6:45 PM CDT for Covington County, Mississippi. It was in force for 30 min.

The area

The counties it named.

The facts

Issued
May 12, 1990, 6:45 PM CDT (23:45 UTC)
Expired
May 12, 1990, 7:15 PM CDT
In force
30 min
Issued by
NWS Jackson, MS
Area
Whole counties

County Covington County, MS

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

Jackson, MS (KJAN), launched 12:00Z, 11.8 hours before the alert went out and 91 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, Jackson, MS at 12:00Z on 1990-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 7 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, Jackson, MS at 12:00Z on 1990-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.193958Sfc1 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
7 J/kg
Mixed-layer CIN
-159 J/kg
Mixed-layer LCL
604 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
82 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.

000 
TTAA00 KJAN 122346
SVRJAN
MSC031-130015-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
645 PM CDT SAT MAY 12 1990
 
THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  715 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL MISSISSIPPI
 
   ...COVINGTON COUNTY
 
AT 644 PM...RADAR INDICATED A SEVERE THUNDERSTORM MOVING INTO
COVINGTON COUNTY. ON ITS PRESENT TRACK...THIS STORM SHOULD PASS NEAR
AND SOUTH OF COLLINS DURING THE NEXT 30 MINUTES.
 
 
SEVERE THUNDERSTORMS PRODUCE WIND IN EXCESS OF 55 MPH...LARGE
HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.  MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.
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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, May 12, 5:02 PM CDT, 1 hour 43 minutes before
MSZ009-012-ALZ008-013-130000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MERIDIAN MS
500 PM CDT SAT MAY 12 1990

SEVERE THUNDERSTORM WATCH NUMBER 219 CONTINUES UNTIL 900 PM CDT FOR
ALL OF EAST CENTRAL MISSISSIPPI.

AT 455 PM RADAR SHOWED A SOLID LINE OF VERY STRONG THUNDERSTORMS THAT
EXTENDED FROM 17 MILES NORTHWEST OF MERIDIAN TO 36 MILES SOUTHWEST OF
MERIDIAN.

THE LINE WAS MOVING EAST AT 40 MPH.

THOSE OF YOU IN LAUDERDALE AND CLARKE COUNTIES OF EAST CENTRAL
MISSISSIPPI SHOULD EXPECT FREQUENT LIGHTNING...STRONG GUSTY WINDS...SMALL
HAIL AND PERIODS OF HEAVY RAINFALL TO START IN THE NEXT 10 TO 40 MINUTES
OR FROM 510 TO 550 PM CDT.
Special weather statement, May 12, 5:10 PM CDT, 1 hour 35 minutes before
MSZ001>004-006-008-010-011-122100-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE JACKSON MS
500 PM CDT SAT MAY 12 1990

...SEVERE THUNDERSTORM WATCH NUMBER 219 REMAINS IN EFFECT FOR CENTRAL
AND SOUTH MISSISSIPPI...

AT 500 PM...A LINE OF STRONG THUNDERSTORMS WITH VERY HEAVY RAINFALL
EXTENDED FROM MERIDIAN TO COLLINS. THE STRONGEST STORMS WERE LOCATED
FROM BAY SPRINGS TO TAYLORSVILLE. STORM MOVEMENT WAS TO THE EAST AT
35 MILES AN HOUR.

THESE STORMS HAVE BEEN ASSOCIATED WITH HAIL...TORRENTIAL RAIN AND
STRONG WINDS. AREAS OF STREET AND HIGHWAY FLOODING HAVE OCCURED WITH
THESE STORMS WITH VICKSBURG AND GREENVILLE REPORTING FLOODING OF
LOW-LYING AREAS.

STRONG THUNDERSTORMS ARE CONTINUING TO DEVELOP OVER NORTHERN LOUISIANA
AND SOUTHERN ARKANSAS AND WILL TRACK OVER CENTRAL AND SOUTHERN
MISSISSIPPI FOR THE NEXT COUPLE OF HOURS. PLEASE REMAIN ALERT TO
CHANGING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS OR WARNINGS.
Special weather statement, May 12, 5:40 PM CDT, 1 hour 5 minutes before
MSZALL-122345-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE JACKSON MS
539 PM CDT SAT MAY 12 1990

...SEVERE THUNDERSTORM WATCH FOR CENTRAL AND SOUTH MISSISSIPPI TILL PM
9 PM...
...FLASH FLOOD WATCH FOR CENTRAL MISSISSIPPI TILL MIDNIGHT...

AT 535 PM CDT...A 50 MILE WIDE AREA OF STRONG THUNDERSTORMS
CONTINUED OVER SOUTH-CENTRAL MISSISSIPPI FROM ABOUT LORMAN TO MAGEE TO
SHUBUTA.  THESE THUNDERSTORMS CONTINUED TO MOVE OVER THE SAME GENERAL
AREA...AND WERE QUICKLY SATURATING THE GROUND.  THE STRONGEST STORMS
WERE OVER NORTHERN LAWRENCE COUNTY...AND BETWEEN LAUREL AND MERIDIAN.

OTHER SCATTERED THUNDERSTORMS WERE STILL INDICATED OVER EASTERN
LOUISIANA...MOVING ;EASTWARD TOWARDS WESTERN MISSISSIPPI.

A LARGE AREA OF RAIN WITH EMBEDDED THUNDERSTORMS CONTINUED OVER THE
NORTHERN HALF OF MISSISSIPPI.

MOVEMENT WAS EAST AT 40 MILES AN HOUR.
Special weather statement, May 12, 6:01 PM CDT, 44 minutes before
MSZ03-08-09-122300

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
555 PM CDT SAT MAY 12 1990

...SEVERE THUNDERSTORM WATCH CANCELLED FOR PORTIONS OF MISSISSIPPI...

SEVERE THUNDERSTORM WATCH NO. 219 FOR CENTRAL AND SOUTH MISSISSIPPI HAS
BEEN CANCELLED FOR THAT AREA NORTH OF A LINE FROM VICKSBURG TO MERIDIAN.

THE STRONGEST THUNDERSTORMS ARE NOW LOCATED SOUTH OF THAT AREA...AND
THE THREAT OF SEVERE WEATHER HAS DECREASED NORTH OF I-2N0.

THE SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT SOUTH OF THE VICKSBURG
TO MERIDIAN LINE...HOWEVER...UNTIL 9 PM.

IN ADDITION...A FLASH FLOOD WATCH REMAINS IN EFFECT FOR MUCH OF
SOUTHCENTRAL MISSISSIPPI UNTIL MIDNIGHT.
Local storm report, May 12, 6:17 PM CDT, 28 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MERIDIAN MS
615 PM CDT SAT MAY 12 1990

AT 545 PM CDT CLARKE COUNTY CIVIL DEFENSE REPORTED SEVERAL POWER
LINES DOWN IN CENTRAL CLARKE COUNTY.
Special weather statement, May 12, 6:39 PM CDT, 6 minutes before
MSZ009-012-ALZ008-013-130100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MERIDIAN MS
635 PM CDT SAT MAY 12 1990

SEVERE THUNDERSTORM WATCH NUMBER 219 HAS BEEN CANCELLED FOR PART OF
EAST CENTRAL MISSISSIPPI.

WATCH NUMBER 219 HAS BEEN CANCELLED NORTH OF A VICKSBURG TO MERIDIAN
LINE.  THE WATCH CONTINUES SOUTH OF THE LINE.

AT 630 PM CDT RADAR INDICATES VERY STRONG THUNDERSTORMS IN NORTHERN
CHOCTAW COUNTY ALABAMA.

THE STORMS WERE MOVING TOWARDS THE EAST AT 30 MPH.

OTHER STRONG THUNDERSTORMS WERE IN CLARKE AND JASPER COUNTIES OF EAST
CENTRAL MISSISSIPPI.  THESE THUNDERSTORMS WERE PRODUCING HEAVY RAIN AND
FLOODING OF LOW LYING AREAS...UNDERPASSES AND STREET IS VERY LIKELY THIS
EVENING.

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 12, 1:08 PM CDTSevere Thunderstorm WarningJANWarren67 min
May 12, 2:20 PM CDTSevere Thunderstorm WarningJANCopiah40 min
May 12, 2:20 PM CDTSevere Thunderstorm WarningJANClaiborne35 min
May 12, 2:30 PM CDTSevere Thunderstorm WarningJANHinds45 min
May 12, 3:00 PM CDTSevere Thunderstorm WarningJANRankin, Simpson45 min
May 12, 5:26 PM CDTSevere Thunderstorm WarningJANClarke34 min
May 12, 5:42 PM CDTSevere Thunderstorm WarningJANJefferson Davis33 min
May 12, 6:16 PM CDTSevere Thunderstorm WarningJANJefferson Davis29 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 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.