Alert archive / Louisiana / Severe Thunderstorm Watches in 2013

Severe Thunderstorm Watch 72

March 31, 201338 parishes in Louisiana; 33 counties in Mississippi; 11 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Mar 31, 2013, 12:17 PM CDT for 38 parishes in Louisiana; 33 counties in Mississippi; 11 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Mar 31, 2013, 12:17 PM CDT (17:17 UTC)
Expired
Mar 31, 2013, 5:57 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 82 counties

Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Iberville Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Livingston Parish, LA, Madison Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Vernon Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Attala County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Hinds County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Newton County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Warren County, MS, Wilkinson County, MS, Yazoo County, MS, Angelina County, TX, Hardin County, TX, Houston County, TX, Jasper County, TX, Newton County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Trinity County, TX, Tyler County, TX

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
20%
One or more EF2 to EF5 tornadoes
10%
Ten or more severe wind reports
90%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Mar 31, 12:17 PM CDTSevere Thunderstorm WarningLCHRapides, Vernon58 min
Mar 31, 12:32 PM CDTSevere Thunderstorm WarningJANEast Carroll, Franklin, Madison, Richland, West Carroll58 min
Mar 31, 12:42 PM CDTSevere Thunderstorm WarningJANCatahoula, Concordia, Franklin, Tensas63 min
Mar 31, 12:54 PM CDTSevere Thunderstorm WarningHGXPolk, San Jacinto, Trinity, Walker51 min
Mar 31, 12:58 PM CDTSevere Thunderstorm WarningSHVCaldwell, Grant, LaSalle32 min
Mar 31, 1:15 PM CDTSevere Thunderstorm WarningJANMadison, Tensas75 min
Mar 31, 1:15 PM CDTSevere Thunderstorm WarningLCHAllen, Avoyelles, Beauregard, Evangeline, Rapides, Saint Landry and 1 more45 min
Mar 31, 1:28 PM CDTSevere Thunderstorm WarningJANCatahoula, Concordia, Tensas47 min
Mar 31, 1:44 PM CDTSevere Thunderstorm WarningHGXPolk, San Jacinto46 min
Mar 31, 1:59 PM CDTSevere Thunderstorm WarningJANConcordia46 min
Mar 31, 2:02 PM CDTSevere Thunderstorm WarningJANHinds, Madison, Yazoo58 min
Mar 31, 2:41 PM CDTSevere Thunderstorm WarningLCHHardin64 min
Mar 31, 3:01 PM CDTSevere Thunderstorm WarningLCHAcadia, Allen, Jefferson Davis44 min
Mar 31, 3:01 PM CDTSevere Thunderstorm WarningLIXEast Feliciana29 min
Mar 31, 3:08 PM CDTSevere Thunderstorm WarningHGXHarris, Liberty, Montgomery, San Jacinto37 min
Mar 31, 3:56 PM CDTSevere Thunderstorm WarningLIXAscension, Livingston, Saint Charles, Saint James, Saint John the Baptist, Saint Tammany and 1 more49 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

Shreveport, LA (KSHV), launched 12:00Z, 5.3 hours before the alert went out and 135 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, Shreveport, LA at 12:00Z on 2013-03-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 252 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, Shreveport, LA at 12:00Z on 2013-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 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
252 J/kg
Mixed-layer CIN
-155 J/kg
Mixed-layer LCL
700 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
122 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 31, 7:36 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 3 more114 min
Mar 31, 9:20 AM CDTSevere Thunderstorm WatchSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more5 hr
Mar 31, 10:33 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 5 more57 min
Mar 31, 11:54 AM CDTMesoscale DiscussionSPCAllen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 20 more36 min
Mar 31, 2:32 PM CDTMesoscale DiscussionSPCAllen, Avoyelles, Beauregard, Calcasieu, Caldwell, Catahoula and 21 more58 min
Mar 31, 2:48 PM CDTSevere Thunderstorm WatchSPCCameron, Iberia, Saint Martin, St. Mary, Vermilion5 hr
Mar 31, 3:21 PM CDTMesoscale DiscussionSPCJefferson, Orleans, Saint Charles, Saint James, Saint John the Baptist, Saint Tammany and 1 more54 min
Mar 31, 3:38 PM CDTSevere Thunderstorm WatchSPCAssumption, Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard and 5 more3 hr
Mar 30, 8:14 PM CDTMesoscale DiscussionSPCClay, Montague, Wichita, Wilbarger91 min
Mar 31, 1:13 AM CDTMesoscale DiscussionSPCWheeler62 min
Mar 31, 4:54 AM CDTMesoscale DiscussionSPCClay, Collin, Cooke, Delta, Denton, Fannin and 8 more96 min
Mar 31, 5:10 AM CDTSevere Thunderstorm WatchSPCAnderson, Bosque, Bowie, Camp, Cass, Cherokee and 44 more7 hr
Mar 31, 1:00 PM CDTMesoscale DiscussionSPCAustin, Bandera, Bastrop, Bexar, Blanco, Brazos and 32 more60 min
Mar 31, 1:17 PM CDTSevere Thunderstorm WatchSPCAtascosa, Austin, Bandera, Bastrop, Bell, Bexar and 47 more9 hr
Mar 31, 5:24 PM CDTMesoscale DiscussionSPCAtascosa, Brazoria, Chambers, DeWitt, Dimmit, Fort Bend and 18 more96 min
Mar 31, 6:20 PM CDTSevere Thunderstorm WatchSPCBee, Duval, Jim Wells, Kleberg, La Salle, Live Oak and 4 more4 hr

Nearby

Severe Thunderstorm Watches in Louisiana, 2013Severe Thunderstorm Watches in Mississippi, 2013Severe Thunderstorm Watches in Texas, 2013Every severe thunderstorm watch in 2013

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.