Alert archive / Mississippi / Tornado Watches in 2002

Tornado Watch 787

December 18, 20024 states

The Storm Prediction Center issued this tornado watch at Dec 18, 2002, 5:50 PM CST for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Dec 18, 2002, 5:50 PM CST (23:50 UTC)
Expired
Dec 18, 2002, 9:00 PM CST
In force
3 hr
Issued by
the Storm Prediction Center
All 41 counties

Chicot County, AR, Crittenden County, AR, Desha County, AR, Lee County, AR, Mississippi County, AR, Phillips County, AR, St. Francis County, AR, Dunklin County, MO, Pemiscot County, MO, Benton County, MS, Bolivar County, MS, Carroll County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Lafayette County, MS, Leflore County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Washington County, MS, Yalobusha County, MS, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 112 km from the middle of the area, began a volume at 23:49 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Warnings issued inside it

6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Dec 18, 5:50 PM CSTTornado WarningLZKDesha45 min
Dec 18, 6:14 PM CSTSevere Thunderstorm WarningMEGDunklin46 min
Dec 18, 6:31 PM CSTTornado WarningMEGPhillips44 min
Dec 18, 6:59 PM CSTSevere Thunderstorm WarningMEGDunklin, Pemiscot46 min
Dec 18, 7:47 PM CSTSevere Thunderstorm WarningMEGSt. Francis43 min
Dec 18, 8:58 PM CSTSevere Thunderstorm WarningMEGCrittenden32 min

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 11.8 hours before the alert went out and 60 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, Little Rock, AR at 12:00Z on 2002-12-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 30 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 12:00Z on 2002-12-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 290 square meters per square second.1939587897117Sfc1 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
30 J/kg
Mixed-layer CIN
-209 J/kg
Mixed-layer LCL
597 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
290 m²/s²
0-3 km storm-relative helicity
365 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 182354
SEL7  
SPC WW 182350
ARZ000-MSZ000-TNZ000-190300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 787
STORM PREDICTION CENTER NORMAN OK
550 PM CST WED DEC 18 2002

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   FAR EASTERN ARKANSAS                           
   NORTHWEST MISSISSIPPI                        
   WEST TENNESSEE                          

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 550 PM UNTIL
900 PM CST.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO
70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 50 STATUTE MILES EAST AND WEST
OF A LINE FROM 30 MILES SOUTH OF GREENVILLE MISSISSIPPI TO 40 MILES
NORTH NORTHEAST OF DYERSBURG TENNESSEE.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...  CONTINUE...WW 784...WW 785...WW 786...

DISCUSSION...SUPERCELLS IN E CNTRL AND NE AR EXPECTED TO CONTINUE
NEWD INTO THE MS DELTA REGION AND FAR W TN LATER THIS EVENING...
WHERE STRONG LOW LEVEL SHEAR /AOA 40 KT/ AND DEEP SHEAR /AOA 60 KT/
WILL REMAIN PRESENT.  DRIER LOW LEVEL AIR SHOULD EVENTUALLY LIMIT
EWD EXTENT OF SEVERE THREAT IN W TN.  IN CONTRAST...TORNADO THREAT
MAY BE ENHANCED DURING THE NEXT FEW HOURS FARTHER S...INVOF WEAK
WARM FRONT WHICH ATTM EXTENDS FROM E OF LIT SE TO NEAR JAN.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH...EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. 
MEAN STORM MOTION VECTOR 22045.

...CORFIDI

363,0881 330,0900 330,0915 363,0900

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 17, 7:35 PM CSTTornado WatchSPCBenton, Boone, Carroll, Madison, Marion, Newton and 1 more5 hr
Dec 17, 10:40 PM CSTTornado WatchSPCBenton, Carroll, Washington5 hr
Dec 18, 3:30 AM CSTTornado WatchSPCBenton5 hr
Dec 18, 7:20 AM CSTTornado WatchSPCBaxter, Boone, Carroll, Crawford, Franklin, Fulton and 12 more6 hr
Dec 18, 1:10 PM CSTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Clark, Cleveland and 26 more8 hr
Dec 18, 2:30 PM CSTTornado WatchSPCBaxter, Clay, Cleburne, Conway, Craighead, Crittenden and 18 more7 hr
Dec 18, 2:15 AM CSTSevere Thunderstorm WatchSPCAdair, Bates, Buchanan, Caldwell, Carroll, Cass and 29 more6 hr
Dec 18, 9:30 AM CSTTornado WatchSPCAdair, Audrain, Barton, Benton, Boone, Callaway and 33 more6 hr
Dec 18, 4:35 PM CSTTornado WatchSPCCrawford, Dent, Franklin, Gasconade, Jefferson, Laclede and 14 more5 hr

Nearby

Tornado Watches in Mississippi, 2002Tornado Watches in Tennessee, 2002Tornado Watches in Arkansas, 2002Every tornado watch in 2002

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; radar from the NEXRAD Level II archive.