Alert archive / Mississippi / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 102, NWS Jackson, MS
NWS Jackson, MS issued this severe thunderstorm warning at May 20, 1990, 3:47 PM CDT for Issaquena County, Sharkey County, Washington County, Mississippi. It was in force for 58 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 20, 1990, 3:47 PM CDT (20:47 UTC)
- Expired
- May 20, 1990, 4:45 PM CDT
- In force
- 58 min
- Issued by
- NWS Jackson, MS
- Area
- Whole counties
Counties Issaquena County, MS, Sharkey County, MS, Washington 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 20, 3:50 PM CDT | Thunderstorm Wind 52 | Issaquena, 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, 8.8 hours before the alert went out and 106 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, 16 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.
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, 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 |
| May 20, 6:43 PM CDT | Severe Thunderstorm Warning | JAN | Covington | 32 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.