Alert archive / Mississippi / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 103, NWS Jackson, MS

May 20, 1990Carroll County, Montgomery County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at May 20, 1990, 4:20 PM CDT for Carroll County, Montgomery County, Mississippi. It was in force for 25 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, 4:20 PM CDT (21:20 UTC)
Expired
May 20, 1990, 4:45 PM CDT
In force
25 min
Issued by
NWS Jackson, MS
Area
Whole counties

Counties Carroll County, MS, Montgomery 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

TimeReportWhereRemark
May 20, 4:40 PM CDTThunderstorm Wind 0Carroll, 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, 9.3 hours before the alert went out and 131 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 1990-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1382 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 1990-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 98 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
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

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KJAN 202123
SVRJAN
MSC015-097-202145-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
420 PM CDT SUN MAY 20 1990
 
THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  445 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN CENTRAL MISSISSIPPI
 
   ...CARROLL COUNTY...MONTGOMERY COUNTY
 
AT 420 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM ABOUT 10 MILES
EAST OF GREENWOOD. THIS THUNDERSTORM WAS MOVING EAST A 45 MPH.
 
 
IF YOU ARE OUTSIDE...SEEK SHELTER IN A STRONG BUILDING AWAY FROM
WINDOWS.  DAMAGING WINDS...LARGE HAIL...VERY HEAVY RAIN...AND
DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERS[TORMS.
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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 20, 3:31 PM CDT, 49 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.

IssuedProductOfficeCountiesLasted
May 20, 2:49 PM CDTSevere Thunderstorm WarningJANWashington41 min
May 20, 3:47 PM CDTSevere Thunderstorm WarningJANIssaquena, Sharkey, Washington58 min
May 20, 4:23 PM CDTSevere Thunderstorm WarningJANHolmes, Yazoo37 min
May 20, 4:34 PM CDTSevere Thunderstorm WarningJANClaiborne, Warren26 min
May 20, 4:34 PM CDTSevere Thunderstorm WarningJANLauderdale26 min
May 20, 4:45 PM CDTSevere Thunderstorm WarningJANCalhoun, Grenada, Webster30 min
May 20, 4:58 PM CDTSevere Thunderstorm WarningJANHinds, Madison32 min
May 20, 5:03 PM CDTSevere Thunderstorm WarningJANAttala, Montgomery27 min
May 20, 5:11 PM CDTSevere Thunderstorm WarningJANRankin34 min
May 20, 5:49 PM CDTSevere Thunderstorm WarningJANLawrence, Walthall26 min
May 20, 5:49 PM CDTSevere Thunderstorm WarningJANAmite, Pike26 min
May 20, 6:03 PM CDTSevere Thunderstorm WarningJANCovington27 min
May 20, 6:07 PM CDTSevere Thunderstorm WarningJANJones53 min
May 20, 6:10 PM CDTSevere Thunderstorm WarningJANJefferson Davis35 min
May 20, 6:43 PM CDTSevere Thunderstorm WarningJANCovington32 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.