Alert archive / Mississippi / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 521
The Storm Prediction Center issued this severe thunderstorm watch at Jun 11, 2003, 7:50 PM CDT for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 11, 2003, 7:50 PM CDT (00:50 UTC)
- Expired
- Jun 12, 2003, 1:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 48 counties
Bibb County, AL, Chilton County, AL, Coosa County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Ashley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, East Carroll Parish, LA, Morehouse Parish, LA, West Carroll Parish, LA, Attala County, MS, Bolivar County, MS, Carroll County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Kemper County, MS, Leake County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Sharkey County, MS, Sunflower County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS
Warnings issued inside it
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 7:56 PM CDT | Severe Thunderstorm Warning | JAN | Grenada | 59 min |
| Jun 11, 7:59 PM CDT | Flash Flood Warning | JAN | Grenada | 3 hr |
| Jun 11, 8:08 PM CDT | Severe Thunderstorm Warning | JAN | Clay | 42 min |
| Jun 11, 8:09 PM CDT | Severe Thunderstorm Warning | JAN | Leflore, Sunflower | 61 min |
| Jun 11, 8:25 PM CDT | Flash Flood Warning | JAN | Leflore | 3 hr |
| Jun 11, 8:47 PM CDT | Severe Thunderstorm Warning | JAN | Carroll | 58 min |
| Jun 11, 9:06 PM CDT | Severe Thunderstorm Warning | LZK | Desha | 59 min |
| Jun 11, 9:36 PM CDT | Severe Thunderstorm Warning | JAN | Bolivar | 59 min |
| Jun 11, 9:58 PM CDT | Flash Flood Warning | LZK | Desha | 3 hr |
| Jun 11, 10:28 PM CDT | Severe Thunderstorm Warning | JAN | Sunflower | 42 min |
| Jun 11, 11:03 PM CDT | Flash Flood Warning | JAN | Carroll, Holmes, Leflore, Sunflower | 3 hr |
| Jun 11, 11:37 PM CDT | Severe Thunderstorm Warning | JAN | Humphreys, Sharkey | 43 min |
| Jun 12, 12:54 AM CDT | Flash Flood Warning | LZK | Desha | 4 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Jackson, MS (KJAN), launched 00:00Z, 0.8 hours before the alert went out and 127 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
- 1555 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 1169 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 153 m²/s²
- 0-3 km storm-relative helicity
- 199 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 4.7
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 120051
SEL1
SPC WW 120050
ALZ000-ARZ000-LAZ000-MSZ000-120600-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 521
NWS STORM PREDICTION CENTER NORMAN OK
750 PM CDT WED JUN 11 2003
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL ALABAMA
SOUTHEAST ARKANSAS
NORTHEAST LOUISIANA
CENTRAL MISSISSIPPI
EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 750 PM
UNTIL 100 AM CDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 45 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 55 MILES WEST SOUTHWEST OF
GREENVILLE MISSISSIPPI TO 50 MILES EAST SOUTHEAST OF BIRMINGHAM
ALABAMA.
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.
OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 514...SEVERE THUNDERSTORM WATCH
NUMBER 515. WATCH NUMBER 514 515 WILL NOT BE IN EFFECT AFTER 750
PM CDT. CONTINUE...WW 512...WW 513...WW 514...WW 515...WW 516...WW
517...WW 518...WW 519...WW 520...
DISCUSSION...STRONG/SEVERE THUNDERSTORMS CONTINUE TO TRAIN EWD AND
DEVELOP SLOWLY SEWD ACROSS WATCH AREA. 00Z SOUNDINGS AT BHM/JAN
INDICATE MDT TO STG INSTABILITY AVAILABLE WHICH SUPPORT CONTINUED
THREAT OF PRIMARILY DAMAGING WINDS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 28025.
...HALES
334,0915 335,0855 323,0855 322,0915
WWUS20 KWNS 120051
SEL1
SPC WW 120050
ALZ000-ARZ000-LAZ000-MSZ000-120600-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 521
NWS STORM PREDICTION CENTER NORMAN OK
750 PM CDT WED JUN 11 2003
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL ALABAMA
SOUTHEAST ARKANSAS
NORTHEAST LOUISIANA
CENTRAL MISSISSIPPI
EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 750 PM
UNTIL 100 AM CDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 45 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 55 MILES WEST SOUTHWEST OF
GREENVILLE MISSISSIPPI TO 50 MILES EAST SOUTHEAST OF BIRMINGHAM
ALABAMA.
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.
OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 514...SEVERE THUNDERSTORM WATCH
NUMBER 515. WATCH NUMBER 514 515 WILL NOT BE IN EFFECT AFTER 750
PM CDT. CONTINUE...WW 512...WW 513...WW 514...WW 515...WW 516...WW
517...WW 518...WW 519...WW 520...
DISCUSSION...STRONG/SEVERE THUNDERSTORMS CONTINUE TO TRAIN EWD AND
DEVELOP SLOWLY SEWD ACROSS WATCH AREA. 00Z SOUNDINGS AT BHM/JAN
INDICATE MDT TO STG INSTABILITY AVAILABLE WHICH SUPPORT CONTINUED
THREAT OF PRIMARILY DAMAGING WINDS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 28025.
...HALES
334,0915 335,0855 323,0855 322,0915SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 9:18 PM CDT | Mesoscale Discussion | SPC | Bibb, Chilton, Fayette, Greene, Hale, Jefferson and 6 more | 87 min |
| Jun 12, 8:51 AM CDT | Mesoscale Discussion | SPC | Washington | 84 min |
| Jun 12, 9:10 AM CDT | Severe Thunderstorm Watch | SPC | Baldwin, Choctaw, Clarke, Mobile, Washington | 5 hr |
| Jun 12, 11:10 AM CDT | Mesoscale Discussion | SPC | Choctaw, Clarke, Mobile, Washington | 95 min |
| Jun 12, 1:15 PM CDT | Mesoscale Discussion | SPC | Clarke, Mobile, Washington | 60 min |
| Jun 12, 1:34 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Chambers, Chilton, Clay and 19 more | 86 min |
| Jun 11, 7:14 PM CDT | Mesoscale Discussion | SPC | Arkansas, Cleveland, Desha, Grant, Jefferson, Lincoln and 1 more | 2 hr |
| Jun 11, 10:25 PM CDT | Severe Thunderstorm Watch | SPC | Crawford, Howard, Montgomery, Pike, Polk, Scott and 2 more | 5 hr |
| Jun 12, 12:14 AM CDT | Mesoscale Discussion | SPC | Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 7 more | 2 hr |
| Jun 12, 1:10 AM CDT | Severe Thunderstorm Watch | SPC | Hempstead, Lafayette, Little River, Miller, Nevada | 4 hr |
| Jun 12, 4:20 AM CDT | Mesoscale Discussion | SPC | Columbia, Lafayette, Miller | 55 min |
| Jun 12, 12:30 AM CDT | Mesoscale Discussion | SPC | Bossier, Caddo, De Soto | 2 hr |
| Jun 12, 4:40 PM CDT | Severe Thunderstorm Watch | SPC | East Baton Rouge, East Feliciana, Livingston, Saint Helena, Saint Tammany, Tangipahoa and 2 more | 4 hr |
Nearby
Severe Thunderstorm Watches in Mississippi, 2003Severe Thunderstorm Watches in Alabama, 2003Severe Thunderstorm Watches in Arkansas, 2003Every severe thunderstorm watch in 2003
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.