Alert archive / Mississippi / Tornado Watches in 2004
Tornado Watch 855
The Storm Prediction Center issued this tornado watch at Oct 18, 2004, 9:45 AM CDT for 18 counties in Arkansas; 21 counties in Mississippi; 4 counties in Tennessee. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 18, 2004, 9:45 AM CDT (14:45 UTC)
- Expired
- Oct 18, 2004, 3:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 43 counties
Arkansas County, AR, Calhoun County, AR, Cleveland County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Monroe County, AR, Ouachita County, AR, Phillips County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, Alcorn County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Chickasaw County, MS, Coahoma County, MS, DeSoto County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union County, MS, Yalobusha County, MS, Fayette County, TN, Hardeman County, TN, McNairy County, TN, Shelby County, TN
The radar
The Little Rock radar (KLZK), 117 km from the middle of the area, began a volume at 14:47 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
17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 18, 9:51 AM CDT | Tornado Warning | LZK | Lonoke | 39 min |
| Oct 18, 9:57 AM CDT | Tornado Warning | LZK | Pulaski | 18 min |
| Oct 18, 10:26 AM CDT | Tornado Warning | LZK | Lonoke, Prairie | 64 min |
| Oct 18, 10:53 AM CDT | Flash Flood Warning | LZK | Lonoke | 2 hr |
| Oct 18, 11:14 AM CDT | Flash Flood Warning | LZK | Prairie | 2 hr |
| Oct 18, 11:19 AM CDT | Tornado Warning | LZK | Monroe | 56 min |
| Oct 18, 11:30 AM CDT | Severe Thunderstorm Warning | LZK | Arkansas, Lonoke, Prairie | 45 min |
| Oct 18, 11:36 AM CDT | Severe Thunderstorm Warning | MEG | Shelby | 39 min |
| Oct 18, 11:56 AM CDT | Flash Flood Warning | MEG | Fayette | 94 min |
| Oct 18, 12:09 PM CDT | Flash Flood Warning | MEG | Shelby | 96 min |
| Oct 18, 12:13 PM CDT | Severe Thunderstorm Warning | MEG | Fayette, Shelby | 47 min |
| Oct 18, 12:16 PM CDT | Flash Flood Warning | MEG | Hardeman | 89 min |
| Oct 18, 12:17 PM CDT | Tornado Warning | MEG | Phillips | 43 min |
| Oct 18, 12:40 PM CDT | Tornado Warning | MEG | Fayette | 35 min |
| Oct 18, 1:09 PM CDT | Severe Thunderstorm Warning | MEG | Panola, Tate, Tunica | 36 min |
| Oct 18, 2:27 PM CDT | Severe Thunderstorm Warning | MEG | Benton, Tippah | 33 min |
| Oct 18, 2:57 PM CDT | Severe Thunderstorm Warning | MEG | Alcorn | 48 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Little Rock, AR (KLZK), launched 12:00Z, 2.8 hours before the alert went out and 105 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.
- Mixed-layer CAPE
- 1504 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 520 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 390 m²/s²
- 0-3 km storm-relative helicity
- 482 m²/s²
- Significant tornado parameter
- 3.3
- Supercell composite
- 16.6
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 181443
SEL5
SPC WW 181445
ARZ000-MSZ000-TNZ000-182000-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 855
NWS STORM PREDICTION CENTER NORMAN OK
945 AM CDT MON OCT 18 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHERN AND EASTERN ARKANSAS
NORTHERN MISSISSIPPI
SOUTHWESTERN TENNESSEE
EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 945 AM UNTIL 300
PM CDT.
TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 50 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 55 MILES WEST OF PINE BLUFF ARKANSAS TO 40
MILES NORTHEAST OF TUPELO MISSISSIPPI.
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.
DISCUSSION...VERY STRONG SHEAR PROFILES ACROSS AREA AS THUNDERSTORMS
CONTINUE TO DEVELOP ALONG AN ENE-WSW AXIS ERN AR AND WRN TN. WITH
VERY MOIST/UNSTABLE AIR MASS FEEDING NEWD ON 40-50 KT LLJ POTENTIAL
FOR TORNADIC SUPERCELLS WILL INCREASE WATCH AREA AS MID LEVEL TROUGH
MOVES EWD ACROSS MID MS VALLEY.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550.
MEAN STORM MOTION VECTOR 24040.
...HALES
345,0925 352,0881 335,0881 332,0925SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 17, 11:30 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Clay, Fulton, Greene, Marion, Randolph and 1 more | 6 hr |
| Oct 18, 2:19 AM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Clark, Clay and 42 more | 56 min |
| Oct 18, 4:40 AM CDT | Mesoscale Discussion | SPC | Clay, Greene, Randolph, Sharp | 35 min |
| Oct 18, 7:44 AM CDT | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 43 more | 61 min |
| Oct 18, 11:29 AM CDT | Mesoscale Discussion | SPC | Arkansas, Calhoun, Cleveland, Dallas, Desha, Drew and 12 more | 91 min |
| Oct 18, 2:18 PM CDT | Mesoscale Discussion | SPC | Arkansas, Calhoun, Cleveland, Dallas, Desha, Drew and 12 more | 57 min |
| Oct 18, 4:05 PM CDT | Tornado Watch | SPC | Baxter, Clay, Cleburne, Craighead, Crittenden, Cross and 15 more | 5 hr |
| Oct 18, 5:21 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 22 more | 114 min |
| Oct 18, 5:50 PM CDT | Tornado Watch | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 20 more | 5 hr |
| Oct 18, 1:55 PM CDT | Mesoscale Discussion | SPC | Stewart | 95 min |
| Oct 18, 3:20 PM CDT | Tornado Watch | SPC | Franklin, Giles, Lincoln | 5 hr |
| Oct 18, 6:02 PM CDT | Mesoscale Discussion | SPC | Franklin, Giles, Lawrence, Lincoln, Moore, Wayne | 88 min |
Nearby
Tornado Watches in Mississippi, 2004Tornado Watches in Arkansas, 2004Tornado Watches in Tennessee, 2004Every tornado watch in 2004
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.