Alert archive / Mississippi / Tornado Watches in 2005

Tornado Watch 153

April 11, 200520 parishes in Louisiana; 34 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Apr 11, 2005, 2:05 PM CDT for 20 parishes in Louisiana; 34 counties in Mississippi. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Apr 11, 2005, 2:05 PM CDT (19:05 UTC)
Expired
Apr 11, 2005, 9:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
All 54 counties

Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Attala County, MS, Choctaw County, MS, Clarke County, MS, Clay County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Monroe County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Wilkinson County, MS, Winston County, MS

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 11, 2:30 PM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, Iberville, Pointe Coupee, West Baton Rouge30 min
Apr 11, 3:00 PM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, Livingston30 min
Apr 11, 3:11 PM CDTSevere Thunderstorm WarningLIXPointe Coupee, West Feliciana34 min
Apr 11, 4:23 PM CDTSevere Thunderstorm WarningJANHinds52 min
Apr 11, 4:41 PM CDTSevere Thunderstorm WarningJANClay, Webster64 min
Apr 11, 4:57 PM CDTSevere Thunderstorm WarningMEGMonroe48 min
Apr 11, 5:19 PM CDTSevere Thunderstorm WarningJANHinds, Rankin56 min
Apr 11, 5:19 PM CDTTornado WarningLIXAmite, Pike41 min
Apr 11, 5:27 PM CDTSevere Thunderstorm WarningJANLincoln48 min
Apr 11, 6:00 PM CDTSevere Thunderstorm WarningLIXSaint Helena, Tangipahoa45 min
Apr 11, 6:10 PM CDTTornado WarningLIXPike, Walthall35 min
Apr 11, 6:19 PM CDTTornado WarningLIXTangipahoa, Washington41 min
Apr 11, 6:36 PM CDTSevere Thunderstorm WarningJANHinds, Madison40 min
Apr 11, 6:41 PM CDTTornado WarningJANMarion64 min
Apr 11, 6:54 PM CDTSevere Thunderstorm WarningLIXTangipahoa, Washington36 min
Apr 11, 6:59 PM CDTTornado WarningLIXWalthall16 min
Apr 11, 7:13 PM CDTSevere Thunderstorm WarningLIXWalthall32 min
Apr 11, 7:44 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa, Washington46 min
Apr 11, 7:51 PM CDTTornado WarningLIXSaint Tammany, Washington24 min
Apr 11, 8:17 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Washington43 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, 7.1 hours before the alert went out and 142 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, Slidell Radar S, LA at 12:00Z on 2005-04-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 46 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, Slidell Radar S, LA at 12:00Z on 2005-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 185 square meters per square second.19395878Sfc1 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
46 J/kg
Mixed-layer CIN
-604 J/kg
Mixed-layer LCL
650 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
185 m²/s²
0-3 km storm-relative helicity
273 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 111908
SEL3  
SPC WW 111908
LAZ000-MSZ000-CWZ000-120200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 153
NWS STORM PREDICTION CENTER NORMAN OK
205 PM CDT MON APR 11 2005

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

       SOUTHERN AND EASTERN LOUISIANA
       SOUTHERN AND EASTERN MISSISSIPPI
       COASTAL WATERS

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 205 PM UNTIL 900
PM CDT.

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

DESTRUCTIVE TORNADOES...LARGE HAIL TO 2.5 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 80 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH OF COLUMBUS
MISSISSIPPI TO 40 MILES SOUTH SOUTHWEST OF INTRACOASTAL CITY
LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 150...WW 151...WW 152...

DISCUSSION...CNTRL LA SQUALL LINE WITH EMBEDDED SUPERCELLS EXPECTED
TO CONTINUE EWD INTO AREA NEAR MS RVR THAT HAS EXPERIENCED GREATER
SURFACE HEATING THAN POINTS FARTHER W. IN ADDITION...OTHER STORMS
ARE FORMING IN LOW LEVEL CONVERGENCE ZONE AHEAD OF SQUALL LINE OVER
S CNTRL LA.  PERSISTENT LARGE SCALE ASCENT IN DIFFLUENCE ZONE OF
APPROACHING UPPER TROUGH AND CONTINUED HEATING SUGGEST THAT RISK FOR
POSSIBLE STRONG TORNADOES...IN ADDITION TO DAMAGING WIND/HAIL...WILL
SPREAD E/NE THROUGH EARLY TONIGHT.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 23035.


...CORFIDI

320,0882 280,0922 302,0922 342,0882

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 11, 3:12 AM CDTMesoscale DiscussionSPCBeauregard, Bienville, Bossier, Caddo, Calcasieu, Claiborne and 6 more63 min
Apr 11, 3:45 AM CDTSevere Thunderstorm WatchSPCBeauregard, Bienville, Bossier, Caddo, Calcasieu, Claiborne and 12 more7 hr
Apr 11, 3:56 AM CDTMesoscale DiscussionSPCFranklin, Madison, Tensas64 min
Apr 11, 6:53 AM CDTMesoscale DiscussionSPCBeauregard, Bienville, Bossier, Caddo, Calcasieu, Claiborne and 12 more67 min
Apr 11, 9:41 AM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 47 more2 hr
Apr 11, 10:15 AM CDTTornado WatchSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 25 more9 hr
Apr 11, 12:12 PM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 47 more2 hr
Apr 11, 1:41 PM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Lafourche and 14 more2 hr
Apr 11, 6:35 PM CDTTornado WatchSPCJefferson, Lafourche, Orleans, Saint Bernard, Saint Charles, Saint Tammany and 1 more4 hr
Apr 11, 6:52 PM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 9 more83 min
Apr 11, 6:17 AM CDTMesoscale DiscussionSPCDeSoto, Tunica118 min
Apr 11, 1:17 PM CDTMesoscale DiscussionSPCAlcorn, Benton, Coahoma, Itawamba, Lafayette, Lee and 10 more58 min
Apr 11, 1:35 PM CDTTornado WatchSPCAlcorn, Benton, Calhoun, Chickasaw, Itawamba, Lafayette and 10 more5 hr

Nearby

Tornado Watches in Mississippi, 2005Tornado Watches in Louisiana, 2005Every tornado watch in 2005

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.