Alert archive / Mississippi / Tornado Warnings in 1990

Tornado Warning 63, NWS Jackson, MS

December 21, 1990Claiborne County, Jefferson County, Mississippi

NWS Jackson, MS issued this tornado warning at Dec 21, 1990, 4:26 PM CST for Claiborne County, Jefferson County, Mississippi. It was in force for 49 min.

The area

The counties it named.

The facts

Issued
Dec 21, 1990, 4:26 PM CST (22:26 UTC)
Expired
Dec 21, 1990, 5:15 PM CST
In force
49 min
Issued by
NWS Jackson, MS
Area
Whole counties

Counties Claiborne County, MS, Jefferson 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, 10.4 hours before the alert went out and 99 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 1990-12-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 572 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 1990-12-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 248 square meters per square second.1939587897Sfc1 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
572 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
685 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
248 m²/s²
0-3 km storm-relative helicity
274 m²/s²
Significant tornado parameter
0.6
Supercell composite
4.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KJAN 212227
TORJAN
MSC063-021-212315-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSON MS
426 PM CST FRI DEC 21 1990
 
THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  515 PM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTHWEST MISSISSIPPI
 
   ...NORTHERN JEFFERSON COUNTY
 
IN WEST CENTRAL MISSISSIPPI
 
   ...CLAIBORNE COUNTY
 
AT 425 PM CST...A TORNADO NEAR THE MISSISSIPPI RIVER 25 MILES
SOUTHWEST OF PORT GIBSON WAS TURNING TO THE EAST AND WILL BE MOVING
INTO CLAIBORNE AND POSSIBLY NORTHERN JEFFERSON COUNTIES WITHIN THE
NEXT FEW MINUTES. THIS STORM WAS MOVING TOWARDS THE PORT GIBSON OR
LORMAN AREA. THE STORM HAS ALREADY PRODUCED DAMAGE OVER EASTERN
LOUISIANA. MOVEMENT WAS NORTHEAST AT 40 MILES AN HOUR.
 
 
 
THIS IS A DANGEROUS STORM.  MOVE QUICKLY TO UNDERGROUND SHELTER IF
AVAILABLE.  OTHERWISE...GO TO AN INTERIOR ROOM ON THE LOWEST FLOOR.
AVOID WINDOWS.  LEAVE CARS AND MOBILE HOMES FOR A STURDY BUILDING.
<

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 21, 1:01 PM CSTTornado WarningJANHolmes, Yazoo44 min
Dec 21, 1:32 PM CSTSevere Thunderstorm WarningJANWashington28 min
Dec 21, 1:44 PM CSTTornado WarningJANCarroll31 min
Dec 21, 1:55 PM CSTTornado WarningJANWashington35 min
Dec 21, 2:00 PM CSTTornado WarningJANSharkey30 min
Dec 21, 2:07 PM CSTTornado WarningJANClaiborne, Warren53 min
Dec 21, 2:18 PM CSTTornado WarningJANGrenada, Montgomery42 min
Dec 21, 2:31 PM CSTSevere Thunderstorm WarningJANSunflower29 min
Dec 21, 2:44 PM CSTTornado WarningJANCalhoun, Yalobusha31 min
Dec 21, 2:45 PM CSTSevere Thunderstorm WarningJANLeflore, Tallahatchie30 min
Dec 21, 2:51 PM CSTSevere Thunderstorm WarningJANHumphreys39 min
Dec 21, 3:00 PM CSTTornado WarningJANWarren, Yazoo45 min
Dec 21, 3:10 PM CSTTornado WarningJANHumphreys35 min
Dec 21, 3:25 PM CSTTornado WarningJANHolmes, Leflore35 min
Dec 21, 3:46 PM CSTSevere Thunderstorm WarningJANYazoo44 min
Dec 21, 3:46 PM CSTTornado WarningJANHolmes44 min
Dec 21, 3:55 PM CSTTornado WarningJANCarroll, Grenada50 min
Dec 21, 4:02 PM CSTTornado WarningJANIssaquena13 min
Dec 21, 4:16 PM CSTSevere Thunderstorm WarningJANSharkey, Washington29 min
Dec 21, 4:25 PM CSTTornado WarningJANIssaquena, Sharkey, Warren50 min
Dec 21, 4:32 PM CSTTornado WarningJANHolmes43 min
Dec 21, 4:47 PM CSTTornado WarningJANCalhoun, Grenada43 min
Dec 21, 4:52 PM CSTTornado WarningJANHumphreys, Sunflower53 min
Dec 21, 4:59 PM CSTTornado WarningJANWarren46 min
Dec 21, 5:07 PM CSTTornado WarningJANAttala, Carroll, Montgomery53 min
Dec 21, 5:36 PM CSTTornado WarningJANCalhoun, Webster54 min
Dec 21, 5:41 PM CSTTornado WarningJANCarroll49 min
Dec 21, 5:46 PM CSTTornado WarningJANWarren44 min

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.