Alert archive / Mississippi / Tornado Watches in 2011

Tornado Watch 232

April 27, 20119 parishes in Louisiana; 69 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Apr 27, 2011, 11:02 AM CDT for 9 parishes in Louisiana; 69 counties in Mississippi. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Apr 27, 2011, 11:02 AM CDT (16:02 UTC)
Expired
Apr 27, 2011, 7:00 PM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Particularly dangerous situation
Yes
Largest hail expected
4 in
Strongest gust expected
70 kt
All 78 counties

Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Adams County, MS, Alcorn County, MS, Attala County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clarke County, MS, Clay County, MS, Coahoma County, MS, Copiah County, MS, Covington County, MS, DeSoto County, MS, Forrest County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lafayette County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Marion County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 61 km from the middle of the area, began a volume at 16:02 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
95%
One or more EF2 to EF5 tornadoes
90%
Ten or more severe wind reports
95%
One or more gusts of 65 knots or more
90%
Ten or more severe hail reports
95%
One or more hailstones of 2 inches or more
90%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 27, 11:10 AM CDTTornado WarningMEGDeSoto, Marshall, Tate50 min
Apr 27, 11:18 AM CDTFlash Flood WarningMEGAlcorn, Benton, Calhoun, Chickasaw, Itawamba, Lafayette and 10 more6 hr
Apr 27, 11:22 AM CDTSevere Thunderstorm WarningJANBolivar53 min
Apr 27, 11:54 AM CDTSevere Thunderstorm WarningJANBolivar36 min
Apr 27, 11:54 AM CDTSevere Thunderstorm WarningMEGCoahoma, DeSoto, Panola, Quitman, Tate, Tunica51 min
Apr 27, 11:56 AM CDTSevere Thunderstorm WarningMEGCoahoma, Panola, Quitman49 min
Apr 27, 12:03 PM CDTTornado WarningJANBolivar, Sunflower40 min
Apr 27, 12:13 PM CDTTornado WarningMEGCoahoma, Lafayette, Panola, Quitman, Tallahatchie, Yalobusha62 min
Apr 27, 12:33 PM CDTSevere Thunderstorm WarningMEGBenton, DeSoto, Marshall, Tate, Tunica42 min
Apr 27, 12:51 PM CDTSevere Thunderstorm WarningJANIssaquena, Sharkey, Washington39 min
Apr 27, 1:00 PM CDTTornado WarningMEGCalhoun, Lafayette, Marshall, Panola, Pontotoc, Quitman and 3 more60 min
Apr 27, 1:03 PM CDTTornado WarningMEGCalhoun, Lafayette, Panola, Tallahatchie, Yalobusha42 min
Apr 27, 1:06 PM CDTSevere Thunderstorm WarningJANHumphreys, Leflore, Sunflower54 min
Apr 27, 1:19 PM CDTTornado WarningMEGCalhoun, Lafayette, Panola, Pontotoc, Quitman, Tallahatchie and 1 more41 min
Apr 27, 1:25 PM CDTSevere Thunderstorm WarningJANLeake, Rankin, Scott50 min
Apr 27, 1:32 PM CDTSevere Thunderstorm WarningMEGBenton, Marshall, Tippah28 min
Apr 27, 1:34 PM CDTSevere Thunderstorm WarningJANCatahoula, Concordia, Tensas56 min
Apr 27, 1:36 PM CDTTornado WarningJANLeake, Scott41 min
Apr 27, 1:37 PM CDTSevere Thunderstorm WarningJANCarroll, Grenada53 min
Apr 27, 1:37 PM CDTTornado WarningMEGCalhoun, Itawamba, Lafayette, Lee, Pontotoc, Prentiss and 3 more53 min
Apr 27, 1:45 PM CDTSevere Thunderstorm WarningMEGCalhoun, Chickasaw, Lafayette, Lee, Pontotoc, Union and 1 more45 min
Apr 27, 1:50 PM CDTSevere Thunderstorm WarningMEGAlcorn, Benton, Lafayette, Marshall, Panola, Prentiss and 2 more40 min
Apr 27, 1:55 PM CDTSevere Thunderstorm WarningMEGBenton, Marshall, Tippah12 min
Apr 27, 1:56 PM CDTFlash Flood WarningMEGTishomingo3 hr
Apr 27, 1:57 PM CDTSevere Thunderstorm WarningJANCarroll, Grenada, Leflore, Montgomery, Webster63 min
Apr 27, 1:58 PM CDTSevere Thunderstorm WarningJANCovington, Jefferson Davis47 min
Apr 27, 2:01 PM CDTTornado WarningMEGCalhoun, Chickasaw, Lafayette, Pontotoc, Yalobusha44 min
Apr 27, 2:03 PM CDTTornado Warning EmergencyJANNeshoba47 min
Apr 27, 2:03 PM CDTTornado WarningJANClaiborne, Jefferson42 min
Apr 27, 2:04 PM CDTTornado WarningJANCarroll, Grenada, Montgomery, Webster56 min
Apr 27, 2:09 PM CDTSevere Thunderstorm WarningJANHolmes, Humphreys, Yazoo51 min
Apr 27, 2:21 PM CDTTornado WarningJANCovington, Jasper, Jones, Smith54 min
Apr 27, 2:23 PM CDTTornado WarningMEGAlcorn, Prentiss, Tippah, Tishomingo, Union37 min
Apr 27, 2:25 PM CDTSevere Thunderstorm WarningMEGAlcorn, Benton, Lafayette, Marshall, Prentiss, Tippah and 1 more50 min
Apr 27, 2:29 PM CDTTornado WarningMEGCalhoun, Chickasaw, Lee, Pontotoc, Yalobusha46 min
Apr 27, 2:31 PM CDTTornado WarningMEGCalhoun, Chickasaw, Lafayette, Lee, Pontotoc, Union44 min
Apr 27, 2:32 PM CDTTornado Warning EmergencyJANKemper, Noxubee, Winston58 min
Apr 27, 2:35 PM CDTTornado WarningMEGCalhoun, Chickasaw, Lee, Monroe40 min
Apr 27, 2:42 PM CDTTornado WarningJANClaiborne, Copiah, Hinds48 min
Apr 27, 2:50 PM CDTTornado WarningMEGAlcorn, Prentiss, Tishomingo40 min
Apr 27, 2:51 PM CDTSevere Thunderstorm WarningJANAttala, Carroll, Montgomery39 min
Apr 27, 2:54 PM CDTTornado WarningMEGItawamba, Lee, Pontotoc, Prentiss, Tishomingo, Union66 min
Apr 27, 2:55 PM CDTSevere Thunderstorm WarningJANKemper, Lauderdale, Neshoba, Newton50 min
Apr 27, 3:01 PM CDTTornado WarningMEGCalhoun, Chickasaw, Itawamba, Monroe59 min
Apr 27, 3:06 PM CDTTornado WarningJANCarroll, Choctaw, Montgomery, Webster54 min
Apr 27, 3:07 PM CDTSevere Thunderstorm WarningMEGAlcorn, Tippah38 min
Apr 27, 3:09 PM CDTTornado Warning EmergencyJANKemper, Neshoba66 min
Apr 27, 3:11 PM CDTSevere Thunderstorm WarningMEGMonroe49 min
Apr 27, 3:21 PM CDTTornado WarningMEGChickasaw, Itawamba, Lee, Monroe54 min
Apr 27, 3:23 PM CDTTornado WarningJANHinds, Rankin52 min
Apr 27, 3:26 PM CDTSevere Thunderstorm WarningJANAttala, Holmes, Leake, Madison52 min
Apr 27, 3:41 PM CDTTornado WarningJANAttala, Choctaw, Oktibbeha, Winston64 min
Apr 27, 3:41 PM CDTTornado WarningMEGPrentiss, Tishomingo34 min
Apr 27, 3:44 PM CDTTornado WarningJANClay, Oktibbeha, Webster44 min
Apr 27, 3:45 PM CDTTornado Warning EmergencyJANNoxubee30 min
Apr 27, 3:53 PM CDTTornado WarningJANRankin, Scott, Simpson, Smith52 min
Apr 27, 3:53 PM CDTTornado WarningMEGMonroe67 min
Apr 27, 4:14 PM CDTSevere Thunderstorm WarningJANWebster26 min
Apr 27, 4:22 PM CDTSevere Thunderstorm WarningJANLauderdale38 min
Apr 27, 4:31 PM CDTSevere Thunderstorm WarningJANCopiah, Simpson44 min
Apr 27, 4:34 PM CDTSevere Thunderstorm WarningMEGChickasaw, Itawamba, Lee, Monroe41 min
Apr 27, 4:36 PM CDTTornado WarningJANOktibbeha39 min
Apr 27, 4:38 PM CDTTornado Warning EmergencyJANJasper, Newton, Scott, Smith67 min
Apr 27, 4:38 PM CDTSevere Thunderstorm WarningMEGMonroe37 min
Apr 27, 4:39 PM CDTSevere Thunderstorm WarningJANClay23 min
Apr 27, 4:41 PM CDTSevere Thunderstorm WarningMEGChickasaw, Itawamba, Monroe37 min
Apr 27, 4:46 PM CDTTornado WarningJANLauderdale29 min
Apr 27, 4:47 PM CDTTornado WarningMEGMonroe28 min
Apr 27, 4:55 PM CDTTornado WarningJANClay, Lowndes45 min
Apr 27, 5:02 PM CDTTornado WarningJANRankin, Simpson, Smith58 min
Apr 27, 5:05 PM CDTFlash Flood WarningMEGAlcorn, Calhoun, Chickasaw, Itawamba, Lee, Monroe and 5 more85 min
Apr 27, 5:23 PM CDTTornado WarningJANLauderdale52 min
Apr 27, 5:43 PM CDTTornado Warning EmergencyJANJasper, Newton50 min
Apr 27, 5:44 PM CDTSevere Thunderstorm WarningJANChoctaw, Clay, Oktibbeha, Webster41 min
Apr 27, 5:47 PM CDTSevere Thunderstorm WarningMEGChickasaw, Itawamba, Lee, Monroe21 min
Apr 27, 6:12 PM CDTTornado WarningJANKemper, Lauderdale33 min
Apr 27, 6:17 PM CDTSevere Thunderstorm WarningJANLawrence, Lincoln, Marion39 min
Apr 27, 6:22 PM CDTTornado Warning EmergencyJANClarke, Lauderdale53 min
Apr 27, 6:31 PM CDTSevere Thunderstorm WarningMEGMonroe14 min
Apr 27, 6:37 PM CDTSevere Thunderstorm WarningJANCovington, Jefferson Davis, Lamar, Marion53 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

Jackson, MS (KJAN), launched 12:00Z, 4.0 hours before the alert went out and 55 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, Jackson, MS at 12:00Z on 2011-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 890 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 12:00Z on 2011-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 449 square meters per square second.1939587897Sfc1 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
890 J/kg
Mixed-layer CIN
-102 J/kg
Mixed-layer LCL
609 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
449 m²/s²
0-3 km storm-relative helicity
786 m²/s²
Significant tornado parameter
0.0
Supercell composite
21.2

Open this sounding in Storm Lab

The text

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

221 
WWUS20 KWNS 271605
SEL2  
SPC WW 271605
ARZ000-LAZ000-MSZ000-280000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 232
NWS STORM PREDICTION CENTER NORMAN OK
1105 AM CDT WED APR 27 2011

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

       EXTREME SOUTHEAST ARKANSAS
       NORTHEAST LOUISIANA
       MUCH OF MISSISSIPPI

EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1105 AM UNTIL
700 PM CDT.

...THIS IS A PARTICULARLY DANGEROUS SITUATION...

DESTRUCTIVE TORNADOES...LARGE HAIL TO 4 INCHES IN DIAMETER...
THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE
POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE
MILES EAST AND WEST OF A LINE FROM 45 MILES EAST SOUTHEAST OF
NATCHEZ MISSISSIPPI TO 50 MILES NORTH OF TUPELO MISSISSIPPI.  FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU2).

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 229...WW 230...WW 231...

DISCUSSION...A VERY VOLATILE SETUP IS DEVELOPING FOR PORTIONS OF MS
LATER TODAY AS A MOIST AND VERY UNSTABLE AIR MASS RETURNS INTO AN
AREA WITH IMPRESSIVE LOW LEVEL AND DEEP LAYER VERTICAL SHEAR
PROFILES.  ACTIVITY IS CURRENTLY DEVELOPING OVER SOUTHEAST
AR/NORTHEAST LA.  HOWEVER...IT APPEARS THE PRIMARY CONCERN WILL
START BY EARLY AFTERNOON OVER CENTRAL/NORTHERN MS WHERE DISCRETE
TORNADIC SUPERCELLS ARE LIKELY.  ALL PARAMETERS SUGGEST THAT
STRONG/VIOLENT AND LONG-TRACK TORNADOES ARE POSSIBLE.  VERY LARGE
HAIL AND WIDESPREAD DAMAGING WINDS ARE ALSO A CONCERN.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 25040.


...HART

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 26, 7:59 PM CDTMesoscale DiscussionSPCColbert, Franklin, Lamar, Lauderdale, Lawrence, Limestone and 1 more2 hr
Apr 26, 9:33 PM CDTTornado Watch PDSSPCColbert, Franklin, Lauderdale7 hr
Apr 26, 11:33 PM CDTMesoscale DiscussionSPCColbert, Franklin, Lamar, Lauderdale, Marion117 min
Apr 27, 1:56 AM CDTMesoscale DiscussionSPCBibb, Blount, Cullman, Fayette, Greene, Hale and 12 more64 min
Apr 27, 2:26 AM CDTTornado WatchSPCBibb, Blount, Calhoun, Cherokee, Chilton, Clay and 29 more6 hr
Apr 27, 8:08 AM CDTTornado WatchSPCColbert, Cullman, DeKalb, Fayette, Franklin, Jackson and 10 more6 hr
Apr 27, 10:45 AM CDTMesoscale DiscussionSPCGreene, Lamar, Marion, Pickens, Sumter90 min
Apr 27, 11:39 AM CDTMesoscale DiscussionSPCCullman, DeKalb, Jackson, Madison, Marshall, Morgan66 min
Apr 27, 1:05 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Chilton, Choctaw and 27 more85 min
Apr 27, 1:42 PM CDTTornado Watch PDSSPCAutauga, Bibb, Blount, Butler, Calhoun, Cherokee and 41 more8 hr
Apr 27, 2:56 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Chilton, Choctaw and 33 more2 hr
Apr 27, 5:01 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Butler, Calhoun, Cherokee and 38 more89 min
Apr 27, 5:41 PM CDTMesoscale DiscussionSPCBarbour, Bullock, Chambers, Crenshaw, Elmore, Lee and 6 more34 min
Apr 27, 5:52 PM CDTTornado Watch PDSSPCBarbour, Bullock, Chambers, Elmore, Lee, Macon and 5 more9 hr
Apr 27, 6:39 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 26 more66 min
Apr 26, 8:53 PM CDTMesoscale DiscussionSPCBeauregard, Bienville, Bossier, Caddo, Claiborne, De Soto and 12 more97 min
Apr 26, 9:42 PM CDTTornado WatchSPCAvoyelles, Beauregard, Rapides, Vernon7 hr
Apr 27, 3:29 AM CDTMesoscale DiscussionSPCBossier, Caddo2 hr
Apr 27, 4:53 AM CDTSevere Thunderstorm WatchSPCBienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 16 more5 hr
Apr 27, 9:48 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 14 more27 min
Apr 26, 9:13 PM CDTMesoscale DiscussionSPCBenton, Bolivar, Coahoma, DeSoto, Marshall, Panola and 3 more62 min
Apr 26, 9:58 PM CDTTornado WatchSPCDeSoto, Tunica7 hr
Apr 27, 6:25 AM CDTMesoscale DiscussionSPCAlcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 33 more65 min
Apr 27, 6:27 PM CDTMesoscale DiscussionSPCClarke, Clay, Copiah, Covington, Forrest, Jasper and 22 more33 min
Apr 27, 6:42 PM CDTTornado WatchSPCClarke, Covington, Forrest, Jasper, Jefferson Davis, Jones and 13 more3 hr

Nearby

Tornado Watches in Mississippi, 2011Tornado Watches in Louisiana, 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.