Alert archive / Mississippi / Tornado Warnings in 1990

Tornado Warning 39, NWS Jackson, MS

May 12, 1990Lamar County, Marion County, Mississippi

NWS Jackson, MS issued this tornado warning at May 12, 1990, 8:35 PM CDT for Lamar County, Marion County, Mississippi. It was in force for 40 min.

The area

The counties it named.

The facts

Issued
May 12, 1990, 8:35 PM CDT (01:35 UTC)
Expired
May 12, 1990, 9:15 PM CDT
In force
40 min
Issued by
NWS Jackson, MS
Area
Whole counties

Counties Lamar County, MS, Marion 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 1.6 hours before the alert went out and 108 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, Slidell Radar S, LA at 00:00Z on 1990-05-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1087 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, Slidell Radar S, LA at 00:00Z on 1990-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 175 square meters per square second.19395878Sfc1 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
1087 J/kg
Mixed-layer CIN
-47 J/kg
Mixed-layer LCL
729 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
175 m²/s²
0-3 km storm-relative helicity
257 m²/s²
Significant tornado parameter
1.2
Supercell composite
8.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KJAN 130136
TORJAN
MSC091-073-130215-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSON MS
835 PM CDT SAT MAY 12 1990
 
THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  915 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL MISSISSIPPI
 
   ...MARION COUNTY
 
IN SOUTHEAST MISSISSIPPI
 
   ...LAMAR COUNTY
 
AT 834 PM...RADAR INDICATED A POSSIBLE TORNADO 5 MILES EAST OF
COLUMBIA IN MARION COUNTY MOVING TOWARD THE EAST AT 40 MPH. ON ITS
PRESENT TRACK...THIS STORM WILL TRACK THROUGH THE CENTRAL PART OF
LAMAR COUNTY.
 
 
SEEK SHELTER IN AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME
OR APARTMENT.  AVOID WINDO+WS AND PROTECT YOUR HEAD FROM FLYING
DEBRIS WITH CUSHIONS OR PILLOWS.
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The office that day

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

IssuedProductOfficeCountiesLasted
May 12, 7:23 PM CDTTornado WarningJANLamar, Marion37 min
May 12, 7:40 PM CDTFlash Flood WarningJANJones5 hr
May 12, 9:31 PM CDTFlash Flood WarningJANForrest3 hr
May 12, 9:58 PM CDTFlash Flood WarningJANCopiah, Covington, Jefferson Davis, Lawrence, Simpson, Smith2 hr
May 12, 9:58 PM CDTFlash Flood WarningJANFranklin, Jefferson, Lincoln2 hr
May 12, 11:16 PM CDTFlash Flood WarningJANWayne6 hr
May 13, 12:18 AM CDTSevere Thunderstorm WarningJANCopiah27 min
May 13, 12:32 AM CDTFlash Flood WarningJANJones5 hr
May 13, 2:24 AM CDTFlash Flood WarningJANClaiborne4 hr
May 13, 5:07 AM CDTFlash Flood WarningJANJones4 hr

Nearby

Tornado Warnings in Mississippi, 1990Every tornado warning in 1990Tornadoes 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.