Alert archive / Mississippi / Tornado Watches in 1998
Tornado Watch 263
The Storm Prediction Center issued this tornado watch at Apr 27, 1998, 9:00 PM CDT for Chicot County, Arkansas; 14 parishes in Louisiana; 37 counties in Mississippi. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 1998, 9:00 PM CDT (02:00 UTC)
- Expired
- Apr 28, 1998, 12:00 AM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 52 counties
Chicot County, AR, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Attala County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Coahoma County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Jefferson County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Madison County, MS, Montgomery County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tishomingo County, MS, Union County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Yalobusha County, MS, Yazoo County, MS
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 9:29 PM CDT | Severe Thunderstorm Warning | MEG | Lafayette | 51 min |
| Apr 27, 9:37 PM CDT | Severe Thunderstorm Warning | JAN | Franklin | 48 min |
| Apr 27, 10:00 PM CDT | Severe Thunderstorm Warning | SHV | LaSalle | 30 min |
| Apr 27, 10:18 PM CDT | Severe Thunderstorm Warning | JAN | Catahoula, Franklin | 47 min |
| Apr 27, 10:21 PM CDT | Severe Thunderstorm Warning | MEG | Union | 34 min |
| Apr 27, 10:32 PM CDT | Severe Thunderstorm Warning | MEG | Prentiss | 58 min |
| Apr 27, 10:36 PM CDT | Severe Thunderstorm Warning | JAN | Tensas | 44 min |
| Apr 27, 11:08 PM CDT | Severe Thunderstorm Warning | JAN | Franklin | 47 min |
| Apr 27, 11:10 PM CDT | Severe Thunderstorm Warning | JAN | Madison | 45 min |
| Apr 27, 11:48 PM CDT | Tornado Warning | JAN | Catahoula, Concordia | 47 min |
| Apr 27, 11:57 PM CDT | Severe Thunderstorm Warning | JAN | Madison | 33 min |
| Apr 27, 11:59 PM CDT | Severe Thunderstorm Warning | JAN | Concordia, Tensas | 51 min |
The nearest sounding before it
Jackson, MS (KJAN), launched 00:00Z, 2.0 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.
- Mixed-layer CAPE
- 1003 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1133 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
971 WWUS9 KMKC 280139 SEL3 MKC WW 280139 MSZ000-LAZ000-280500- BULLETIN - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 263 STORM PREDICTION CENTER NORMAN OK 839 PM CDT MON APR 27 1998 THE STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF NORTHERN AND WESTERN MISSISSIPPI CENTRAL AND NORTHEAST LOUISIANA EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 900 PM UNTIL MIDNIGHT 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 65 STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES SOUTH SOUTHEAST OF ALEXANDRIA LOUISIANA TO 35 MILES NORTHEAST OF OXFORD 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. OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES SEVERE THUNDERSTORM WATCH NUMBER 261. WATCH NUMBER 261 WILL NOT BE IN EFFECT AFTER 900 PM CDT. CONTINUE...WW 260...WW 262... DISCUSSION...BAND OF STRONG/SEVERE THUNDERSTORMS FROM NORTH MISSISSIPPI INTO CENTRAL LOUISIANA IS EXPECTED TO MOVE EASTWARD TONIGHT WITHIN BAND OF STRONG SOUTHWESTERLY MID/UPPER LEVEL WINDS. 00Z SOUNDINGS INDICATE MODERATE INSTABILITY WITH CAPE OF 1500-2000 J/KG. ALTHOUGH LOW LEVEL WINDS ARE RELATIVELY WEAK...VEERING PROFILE AND STRONG SHEAR IN THE LOW-TO-MID LEVELS SUGGESTS CONTINUED POTENTIAL FOR ISOLATED SUPERCELLS NEXT SEVERAL HOURS. 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 450. MEAN STORM MOTION VECTOR 23035. ...WEISS 311,0931 344,0901 344,0875 311,0910
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 12:00 AM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Avoyelles, Cameron, Catahoula, Concordia and 16 more | 5 hr |
| Apr 28, 2:15 AM CDT | Severe Thunderstorm Watch | SPC | Ascension, Assumption, Iberia, Lafourche, Livingston, Orleans and 8 more | 5 hr |
| Apr 27, 7:15 PM CDT | Tornado Watch | SPC | Alcorn, Calhoun, Chickasaw, Itawamba, Lee, Monroe and 5 more | 5 hr |
Nearby
Tornado Watches in Mississippi, 1998Tornado Watches in Louisiana, 1998Tornado Watches in Arkansas, 1998Every tornado watch in 1998
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.