Alert archive / Mississippi / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 116, NWS Jackson, MS
NWS Jackson, MS issued this severe thunderstorm warning at May 20, 1990, 6:43 PM CDT for Covington County, Mississippi. It was in force for 32 min.
The area
The counties it named.
The facts
- Issued
- May 20, 1990, 6:43 PM CDT (23:43 UTC)
- Expired
- May 20, 1990, 7:15 PM CDT
- In force
- 32 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, 11.7 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
- 1382 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 636 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 116 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 2.8
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 20, 3:31 PM CDT, 3 hours 12 minutes before
MSZALL-202135- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE JACKSON MS 325 PM CDT SUN MAY 20 1990 ...SEVERE THUNDERSTORM WATCH UNTIL 9 PM FOR MUCH OF MISSISSIPPI... AT 325 PM...A LINE OF STRONG THUNDERSTORMS WAS BEGINNING TO MOVE INTO NORTHWEST MISSISSIPPI JUST SOUTH OF GREENVILLE. THIS LINE EXTENDS SOUTHWESTWARD INTO CENTRAL LOUISIANA...AND IS MOVING SLOWLY TOWARD THE EAST. THE STRONGEST STORMS IN THE LINE ARE IN WASHINGTON COUNTY NEAR HOLLANDALE. GOLF BALL SIZE HAIL WAS REPORTED JUST WEST OF THE MISSISSIPPI RIVER WHEN THESE STORMS PASSED THROUGH SOUTHEASTERN ARKANSAS...SO PEOPLE JUST SOUTH OF GREENVILLE SHOULD BE PREPARED TO MOVE TO A SAFE PLACE IF THREATENING WEATHER APPROACHES. OTHER SHOWERS AND WEAKER THUNDERSTORMS ARE SCATTERED OVER WEST AND EXTREME EAST MISSISSIPPI.
Special weather statement, May 20, 4:30 PM CDT, 2 hours 13 minutes before
MSZ009-012-ALZ008-013- - SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MERIDIAN MS 420 PM CDT SUN MAY 20 1990 ...SEVERE THUNDERSTORM WATCH NUMBER 281 IS IN EFFECT FOR ALL OF EAST CENTRAL MISSISSIPPI UNTIL 900 PM CDT... ...SEVERE THUNDERSTORM WATCH NUMBER 285 IS IN EFFECT FOR SUMTER AND CHOCTAW COUNTIES IN EXTREME WEST CENTRAL ALABAMA UNTIL 1000 PM CDT... AT 415 PM CDT MERIDIAN WEATHER SERVICE RADAR SHOWED SCATTERED VERY STRONG THUNDERSTORMS ALONG AND NORTH OF A LINE FROM BELZONI TO WINONA TO TUSCALOOSA ALABAMA. ALSO THERE WERE ISOLATED SHOWERS AND THUNDERSHOWERS IN THE CENTRAL AREAS OF MISSISSIPPI. THE PREgHUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS BOTH EAST CENTAL MISSISSIPPI AND EXTREME WEST CENTRAL ALABAMA IN THE NEXT HOUR. ALL IN THESE AREAS SHOULD CONTINUE TO BE WEATHER ALERT FOR THE NEXT SEVERAL HOURS.
Special weather statement, May 20, 4:44 PM CDT, 1 hour 59 minutes before
MSZALL-202235- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE JACKSON MS 440 PM CDT SUN MAY 20 1990 ...SEVERE THUNDERSTORM WATCH UNTIL 9 PM FOR MUCH OF MISSISSIPPI... AT 430 PM...A LINE OF STRONG THUNDERSTORMS EXTENDED FROM GREENWOOD TO PORT GIBSON. STRONG THUNDERSTORMS WERE ALSO LOCATED OVER EAST CENTRAL MISSISSIPPI IN LAUDERDALE COUNTY. OTHER THUNDERSTORMS AND PATCHES OF LIGHT RAIN WERE SCATTERED OVER MISSISSIPPI. w MOVEMENT WAS EAST AT 45 MILES AN HOUR.
Special weather statement, May 20, 5:35 PM CDT, 1 hour 8 minutes before
MSZALL-202235- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE JACKSON MS 535 PM CDT SUN MAY 20 1990 ...SEVERE THUNDERSTORM WATCH UNTIL 9 PM FOR MUCH OF MISSISSIPPI... AT 530 PM...A LINE OF STRONG THUNDERSTORMS EXTENDED FROM TUPELO THROUGH JACKSON TO MCCOMB. ANOTHER LINE OF STRONG THUNDERSTORMS ALSO EXTENDED FROM MERIDIAN TO HATTIESBURG. PERSONS IN MISSISSIPPI SHOULD BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS IN THE =APPROACH OF THESE THUNDERSTORMS. MOVEMENT WAS EAST AT 45 MILES AN HOUR.
The office that day
Everything else NWS Jackson, MS issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 2:49 PM CDT | Severe Thunderstorm Warning | JAN | Washington | 41 min |
| May 20, 3:47 PM CDT | Severe Thunderstorm Warning | JAN | Issaquena, Sharkey, Washington | 58 min |
| May 20, 4:20 PM CDT | Severe Thunderstorm Warning | JAN | Carroll, Montgomery | 25 min |
| May 20, 4:23 PM CDT | Severe Thunderstorm Warning | JAN | Holmes, Yazoo | 37 min |
| May 20, 4:34 PM CDT | Severe Thunderstorm Warning | JAN | Claiborne, Warren | 26 min |
| May 20, 4:34 PM CDT | Severe Thunderstorm Warning | JAN | Lauderdale | 26 min |
| May 20, 4:45 PM CDT | Severe Thunderstorm Warning | JAN | Calhoun, Grenada, Webster | 30 min |
| May 20, 4:58 PM CDT | Severe Thunderstorm Warning | JAN | Hinds, Madison | 32 min |
| May 20, 5:03 PM CDT | Severe Thunderstorm Warning | JAN | Attala, Montgomery | 27 min |
| May 20, 5:11 PM CDT | Severe Thunderstorm Warning | JAN | Rankin | 34 min |
| May 20, 5:49 PM CDT | Severe Thunderstorm Warning | JAN | Lawrence, Walthall | 26 min |
| May 20, 5:49 PM CDT | Severe Thunderstorm Warning | JAN | Amite, Pike | 26 min |
| May 20, 6:03 PM CDT | Severe Thunderstorm Warning | JAN | Covington | 27 min |
| May 20, 6:07 PM CDT | Severe Thunderstorm Warning | JAN | Jones | 53 min |
| May 20, 6:10 PM CDT | Severe Thunderstorm Warning | JAN | Jefferson Davis | 35 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.