Alert archive / Mississippi / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 101, NWS Jackson, MS

May 20, 1990Washington County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at May 20, 1990, 2:49 PM CDT for Washington County, Mississippi. It was in force for 41 min.

The area

The counties it named.

The facts

Issued
May 20, 1990, 2:49 PM CDT (19:49 UTC)
Expired
May 20, 1990, 3:30 PM CDT
In force
41 min
Issued by
NWS Jackson, MS
Area
Whole counties

County Washington 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, 7.8 hours before the alert went out and 134 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 201952
SVRJAN
MSC151-202030-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
249 PM CDT SUN MAY 20 1990
 
THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  330 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTHWEST MISSISSIPPI
 
   ...WASHINGTON COUNTY
 
AT 250 PM...RADAR INDICATED A SEVERE THUNDERSTORM JUST WEST OF THE
MISSISSIPPI RIVER ABOUT TO MOVE INTO WASHINGTON COUNTY. THIS STORM IS
MOVING TOWARD THE EAST NORTHEAST AT 30 MPH...AND SHOULD MOVE TO NEAR
HOLLANDALE BY 330 PM.
 
 
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 THUNDERSTORMS.
<

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, 9:12 AM CDT, 5 hours 37 minutes before
MSZ003-005-006-007-008-201600-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
910 AM CDT SUN MAY 20 1990

A LINE OF THUNDERSTORMS CONTINUES MOVING ACROSS CENTRAL AND NORTH
MISSISSIPPI THIS MORNING...AND IS NOW LOCATED FROM THE TUPELO AREA
SOUTHWESTWARD TO NEAR VICKSBURG.  HEAVY RAINS AND GUSTY WINDS WILL
ACCOMPANY THIS LINE OF STORMS AS IT MOVES TOWARD THE EAST INTO THE
KOSCIUSKO-STARKVILLE-AND COLUMBUS AREAS.  LIGHTER SHOWERS WILL SPREAD
INTO CENTRAL MISSISSIPPI FROM VICKSBURG INTO THE JACKSON AREA DURING
THE NEXT HOUR OR TWO.

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 20, 3:47 PM CDTSevere Thunderstorm WarningJANIssaquena, Sharkey, Washington58 min
May 20, 4:20 PM CDTSevere Thunderstorm WarningJANCarroll, Montgomery25 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; the sounding from the Mesonet's radiosonde archive.