Alert archive / Mississippi / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 90, NWS Jackson, MS
NWS Jackson, MS issued this severe thunderstorm warning at May 12, 1990, 2:20 PM CDT for Copiah County, Mississippi. It was in force for 40 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
- May 12, 1990, 2:20 PM CDT (19:20 UTC)
- Expired
- May 12, 1990, 3:00 PM CDT
- In force
- 40 min
- Issued by
- NWS Jackson, MS
- Area
- Whole counties
County Copiah County, MS
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 12, 2:55 PM CDT | Thunderstorm Wind 0 | Copiah, MS |
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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Jackson, MS (KJAN), launched 12:00Z, 7.3 hours before the alert went out and 61 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 121921 SVRJAN MSC029-021-122000- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE JACKSON MS 220 PM CDT SAT MAY 12 1990 THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 300 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN CENTRAL MISSISSIPPI ...NORTHERN COPIAH COUNTY IN WEST CENTRAL MISSISSIPPI ...EASTERN CLAIBORNE COUNTY AT 215 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM NEAR HERMANVILLE IN CLAIBORNE COUNTY. THE STORM WAS MOVING TO THE EAST AT 35 MILES AND HOUR...AND WILL MOVE TO NEAR CRYSTAL SPRINGS AROUND 300 PM CDT. SEVERE THUNDERSTORMS PRODUCE WIND IN EXCESS OF 55 MPH...L+ARGE 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, 12:28 PM CDT, 1 hour 52 minutes before
MSZ001-002-003-004-006-008-010-121745- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE JACKSON MS 1220 PM CDT SAT MAY 12 1990 RAIN AND THUNDERSTORMS CONTINUE TO SPREAD INTO WEST MISSISIPPI AT 1215 PM A VERY STRONG THUNDERSTORM WAS LOCATED IN LOUISIANA ABOUT 15 MILES SOUTHEAST OF MONROE LOUISIANA. THIS STORM WAS MOVING TO THE EAST AT 35 MILES AN HOUR...AND WILL CROSS THE RIVER INTO WARREN COUNTY IN A LITTLE OVER AN HOUR. A SEVERE THUNDERSTORM WARNING IS IN EFFECT FOR THIS STORM. OTHER THUNDERSTORMS CONTINUE TO SPREAD OVER NORTHWEST MISSISSIPPI...AND SOME OF THE STRONGER STORMS MAY BE ACCOMPANIED BY GUSTY WINDS IN EXCESS OF 40 MILES AND HOURS...BRIEF VERY HEAVY RAIN...FREQUENT CLOUD TO GROUND LIGHTNING AND POSSIBLE HAIL. PERSONS IN WEST MISSISSIPPI SHOULD BE ON THE ALERT FOR POSSIBLE THREATENING WEATHER FOR THE NEXT SEVERAL HOURS.
Special weather statement, May 12, 1:54 PM CDT, 26 minutes before
MSZ001-002-003-004-006-008-010-121900- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE JACKSON MS 130 PM CDT SAT MAY 12 1990 ...SEVERE THUNDERSTORM WATCH NUMBER 219 REMAIN IN EFFECT FOR CENTRAL AND SOUTH MISSISSIPPI... AT 130 PM...A LINE OF STRONG THUNDERSTORMS WITH VERY HEAVY RAINFALL EXTENDED FORM VICKSBURG MISSISSIPPI TO TO JENA IN EAST LOUISIANA. THE STRONGEST THUNDERSTORM WAS LOCATED 15 MILES SOUTHEAST OF VICKSBURG. AT 145 PM PEA TO MARBLE SIZE HAIL...TORRENTAIL RAIN...AND VERY STRONG WINDS WERE REPORTED BY THE VICKSBURG POLICE DEPARTMENT AT 145 PM. MOVEMENT WAS EAST AT 35 MILES AN HOUR.
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 | 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 |
| May 12, 6:45 PM CDT | Severe Thunderstorm Warning | JAN | Covington | 30 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.