Alert archive / Mississippi / Tornado Watches in 2011
Tornado Watch 96
The Storm Prediction Center issued this tornado watch at Apr 4, 2011, 5:28 PM CDT for 4 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 4, 2011, 5:28 PM CDT (22:28 UTC)
- Expired
- Apr 4, 2011, 11:59 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 68 counties
Baldwin County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, Amite County, MS, Clarke County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS
The radar
The Mobile radar (KMOB), 106 km from the middle of the area, began a volume at 22:29 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 50%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
47 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 4, 5:34 PM CDT | Severe Thunderstorm Warning | JAN | Neshoba, Winston | 31 min |
| Apr 4, 5:36 PM CDT | Severe Thunderstorm Warning | LIX | Ascension, East Baton Rouge, Iberville, Livingston, West Baton Rouge | 54 min |
| Apr 4, 5:39 PM CDT | Tornado Warning | JAN | Rankin, Simpson, Smith | 51 min |
| Apr 4, 5:45 PM CDT | Severe Thunderstorm Warning | LIX | East Baton Rouge, East Feliciana, Saint Helena, West Baton Rouge | 60 min |
| Apr 4, 5:47 PM CDT | Severe Thunderstorm Warning | LIX | Pike, Walthall | 58 min |
| Apr 4, 5:48 PM CDT | Severe Thunderstorm Warning | JAN | Jefferson Davis, Lawrence, Lincoln | 42 min |
| Apr 4, 5:50 PM CDT | Severe Thunderstorm Warning | JAN | Kemper, Neshoba, Noxubee, Winston | 55 min |
| Apr 4, 5:56 PM CDT | Tornado Warning | JAN | Jefferson Davis, Lawrence | 64 min |
| Apr 4, 6:03 PM CDT | Severe Thunderstorm Warning | LIX | East Feliciana, Saint Helena, Tangipahoa, Washington | 42 min |
| Apr 4, 6:07 PM CDT | Severe Thunderstorm Warning | JAN | Jasper, Simpson, Smith | 38 min |
| Apr 4, 6:08 PM CDT | Severe Thunderstorm Warning | LIX | East Baton Rouge, Livingston, Saint Helena, Saint Tammany, Tangipahoa, Washington | 67 min |
| Apr 4, 6:19 PM CDT | Severe Thunderstorm Warning | JAN | Jasper, Newton, Scott, Smith | 41 min |
| Apr 4, 6:23 PM CDT | Tornado Warning | JAN | Covington, Forrest, Lamar, Marion | 27 min |
| Apr 4, 6:24 PM CDT | Tornado Warning | LIX | Livingston, Tangipahoa | 36 min |
| Apr 4, 6:28 PM CDT | Severe Thunderstorm Warning | JAN | Covington, Jones | 62 min |
| Apr 4, 6:34 PM CDT | Severe Thunderstorm Warning | LIX | Ascension, Assumption, Livingston, Saint Charles, Saint James, Saint John the Baptist and 1 more | 41 min |
| Apr 4, 6:39 PM CDT | Severe Thunderstorm Warning | JAN | Lauderdale | 51 min |
| Apr 4, 6:43 PM CDT | Severe Thunderstorm Warning | MOB | Choctaw, Washington | 47 min |
| Apr 4, 6:47 PM CDT | Tornado Warning | LIX | Assumption, Lafourche, Saint Charles, Saint James, Saint John the Baptist | 28 min |
| Apr 4, 6:51 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany, Tangipahoa, Washington | 54 min |
| Apr 4, 6:51 PM CDT | Severe Thunderstorm Warning | JAN | Clarke | 39 min |
| Apr 4, 6:51 PM CDT | Severe Thunderstorm Warning | JAN | Marion | 39 min |
| Apr 4, 6:52 PM CDT | Severe Thunderstorm Warning | JAN | Covington, Forrest, Jones, Lamar | 68 min |
| Apr 4, 7:00 PM CDT | Tornado Warning | LIX | Saint Tammany | 45 min |
| Apr 4, 7:05 PM CDT | Severe Thunderstorm Warning | MOB | Choctaw, Clarke, Washington | 55 min |
| Apr 4, 7:08 PM CDT | Tornado Warning | MOB | Choctaw, Clarke, Washington | 67 min |
| Apr 4, 7:09 PM CDT | Tornado Warning | JAN | Forrest, Jones, Lamar | 27 min |
| Apr 4, 7:17 PM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Lafourche, Saint Charles, Saint James, Saint John the Baptist | 43 min |
| Apr 4, 7:30 PM CDT | Severe Thunderstorm Warning | MOB | Choctaw, Clarke, Mobile, Washington, Wilcox | 60 min |
| Apr 4, 7:32 PM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Orleans, Plaquemines, Saint Bernard | 43 min |
| Apr 4, 7:37 PM CDT | Tornado Warning | LIX | Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles | 23 min |
| Apr 4, 7:38 PM CDT | Tornado Warning | MOB | Washington | 56 min |
| Apr 4, 7:42 PM CDT | Tornado Warning | LIX | Saint Tammany | 48 min |
| Apr 4, 7:47 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany | 73 min |
| Apr 4, 7:54 PM CDT | Tornado Warning | MOB | Choctaw, Clarke, Washington | 53 min |
| Apr 4, 7:55 PM CDT | Tornado Warning | LIX | Plaquemines, Saint Bernard | 35 min |
| Apr 4, 8:04 PM CDT | Tornado Warning | LIX | Harrison | 41 min |
| Apr 4, 8:16 PM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Plaquemines, Saint Bernard | 44 min |
| Apr 4, 8:21 PM CDT | Tornado Warning | MOB | Clarke, Monroe, Washington | 39 min |
| Apr 4, 8:30 PM CDT | Severe Thunderstorm Warning | MOB | Baldwin, Butler, Clarke, Conecuh, Escambia, Mobile and 3 more | 60 min |
| Apr 4, 8:31 PM CDT | Tornado Warning | LIX | Jackson | 44 min |
| Apr 4, 8:49 PM CDT | Severe Thunderstorm Warning | LIX | Plaquemines | 71 min |
| Apr 4, 9:41 PM CDT | Severe Thunderstorm Warning | MOB | Butler, Conecuh, Covington, Crenshaw, Escambia | 64 min |
| Apr 4, 9:44 PM CDT | Severe Thunderstorm Warning | MOB | Baldwin, Covington, Escambia | 61 min |
| Apr 4, 10:46 PM CDT | Severe Thunderstorm Warning | MOB | Covington | 44 min |
| Apr 4, 11:01 PM CDT | Tornado Warning | MOB | Okaloosa | 14 min |
| Apr 4, 11:30 PM CDT | Severe Thunderstorm Warning | MOB | Okaloosa | 15 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
Slidell Radar S, LA (KSIL), launched 12:00Z, 10.5 hours before the alert went out and 72 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
- 1669 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 624 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 245 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
397
WWUS20 KWNS 042228
SEL6
SPC WW 042228
ALZ000-FLZ000-LAZ000-MSZ000-CWZ000-050600-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 96
NWS STORM PREDICTION CENTER NORMAN OK
530 PM CDT MON APR 4 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHERN ALABAMA
WESTERN FLORIDA PANHANDLE
EASTERN LOUISIANA
CENTRAL AND SOUTHERN MISSISSIPPI
COASTAL WATERS
EFFECTIVE THIS MONDAY AFTERNOON AND TUESDAY MORNING FROM 530 PM
UNTIL 100 AM CDT.
TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 120 STATUTE
MILES EAST AND WEST OF A LINE FROM 60 MILES NORTHWEST OF
EVERGREEN ALABAMA TO 40 MILES SOUTH OF HOUMA LOUISIANA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU6).
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 91...WW 93...WW 94...WW
95...
DISCUSSION...SRN FRINGES OF QLCS IS EXPECTED TO INTENSIFY ACROSS THE
REGION AS UPPER LEVEL TROUGH CONTINUES EWD THIS EVENING. STRONG
PRESSURE FALLS DOWNSTREAM WILL RESULT IN ENHANCED LOW-LEVEL RESPONSE
WITH THREAT FOR TORNADOES WITH ANY EMBEDDED ROTATING STRUCTURES
EMBEDDED WITHIN THE LINE. OTHERWISE...BOWS/LEWPS WILL BE CAPABLE OF
DAMAGING WIND GUSTS.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 26040.
...RACYSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 4, 10:25 AM CDT | Mesoscale Discussion | SPC | Colbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 9 more | 2 hr |
| Apr 4, 1:03 PM CDT | Tornado Watch | SPC | Blount, Colbert, Cullman, DeKalb, Fayette, Franklin and 16 more | 7 hr |
| Apr 4, 2:52 PM CDT | Mesoscale Discussion | SPC | Choctaw, Fayette, Greene, Pickens, Sumter, Tuscaloosa | 113 min |
| Apr 4, 4:28 PM CDT | Mesoscale Discussion | SPC | Autauga, Baldwin, Bullock, Butler, Calhoun, Chambers and 29 more | 62 min |
| Apr 4, 4:55 PM CDT | Tornado Watch | SPC | Autauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 28 more | 6 hr |
| Apr 4, 6:50 PM CDT | Mesoscale Discussion | SPC | Autauga, Baldwin, Bibb, Blount, Butler, Calhoun and 36 more | 85 min |
| Apr 4, 7:44 AM CDT | Severe Thunderstorm Watch | SPC | Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more | 8 hr |
| Apr 4, 10:53 AM CDT | Tornado Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 32 more | 7 hr |
| Apr 4, 11:20 AM CDT | Mesoscale Discussion | SPC | Beauregard, Bienville, Caldwell, Claiborne, De Soto, Grant and 12 more | 115 min |
| Apr 4, 7:22 AM CDT | Tornado Watch | SPC | Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more | 7 hr |
Nearby
Tornado Watches in Mississippi, 2011Tornado Watches in Louisiana, 2011Tornado Watches in Alabama, 2011Every tornado watch in 2011
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.