Alert archive / Mississippi / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 98, NWS Jackson, MS
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.
- 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
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. <
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 12, 1:08 PM CDT | Severe Thunderstorm Warning | JAN | Warren | 67 min |
| May 12, 2:20 PM CDT | Severe Thunderstorm Warning | JAN | Copiah | 40 min |
| May 12, 2:20 PM CDT | Severe Thunderstorm Warning | JAN | Claiborne | 35 min |
| May 12, 2:30 PM CDT | Severe Thunderstorm Warning | JAN | Hinds | 45 min |
| May 12, 3:00 PM CDT | Severe Thunderstorm Warning | JAN | Rankin, Simpson | 45 min |
| May 12, 5:26 PM CDT | Severe Thunderstorm Warning | JAN | Clarke | 34 min |
| May 12, 5:42 PM CDT | Severe Thunderstorm Warning | JAN | Jefferson Davis | 33 min |
| May 12, 6:16 PM CDT | Severe Thunderstorm Warning | JAN | Jefferson Davis | 29 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.