Alert archive / Louisiana / Tornado Watches in 2007

Tornado Watch 139

April 14, 200725 parishes in Louisiana; 8 counties in Mississippi; Jasper County, Newton County, Texas

The Storm Prediction Center issued this tornado watch at Apr 14, 2007, 1:41 AM CDT for 25 parishes in Louisiana; 8 counties in Mississippi; Jasper County, Newton County, Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 14, 2007, 1:41 AM CDT (06:41 UTC)
Expired
Apr 14, 2007, 8:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 35 counties

Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Richland Parish, LA, Saint Landry Parish, LA, Tensas Parish, LA, Union Parish, LA, Vernon Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Claiborne County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Sharkey County, MS, Warren County, MS, Washington County, MS, Jasper County, TX, Newton County, TX

What SPC expected

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

Two or more tornadoes
30%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
20%
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
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 14, 1:54 AM CDTTornado WarningJANMorehouse51 min
Apr 14, 2:38 AM CDTSevere Thunderstorm WarningJANEast Carroll, West Carroll26 min
Apr 14, 2:56 AM CDTSevere Thunderstorm WarningJANRichland34 min
Apr 14, 3:30 AM CDTSevere Thunderstorm WarningJANFranklin, Richland45 min
Apr 14, 4:00 AM CDTSevere Thunderstorm WarningJANEast Carroll, Madison30 min
Apr 14, 4:24 AM CDTSevere Thunderstorm WarningJANIssaquena, Sharkey36 min
Apr 14, 5:51 AM CDTSevere Thunderstorm WarningJANIssaquena, Warren27 min
Apr 14, 6:09 AM CDTSevere Thunderstorm WarningJANConcordia32 min
Apr 14, 6:17 AM CDTSevere Thunderstorm WarningJANTensas16 min
Apr 14, 6:25 AM CDTSevere Thunderstorm WarningJANAdams50 min
Apr 14, 6:26 AM CDTSevere Thunderstorm WarningJANClaiborne, Warren49 min
Apr 14, 6:49 AM CDTSevere Thunderstorm WarningJANJefferson26 min
Apr 14, 7:00 AM CDTSevere Thunderstorm WarningJANClaiborne30 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 00:00Z, 6.7 hours before the alert went out and 143 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 00:00Z on 2007-04-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1090 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 00:00Z on 2007-04-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 557 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
1090 J/kg
Mixed-layer CIN
-122 J/kg
Mixed-layer LCL
629 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
557 m²/s²
0-3 km storm-relative helicity
778 m²/s²
Significant tornado parameter
0.0
Supercell composite
33.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 13, 8:42 PM CDTMesoscale DiscussionSPCAllen, Avoyelles, Beauregard, Bienville, Bossier, Caddo and 22 more2 hr
Apr 14, 1:34 AM CDTMesoscale DiscussionSPCAllen, Avoyelles, Caldwell, Catahoula, Concordia, East Carroll and 14 more56 min
Apr 14, 6:17 AM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Lafayette and 13 more88 min
Apr 14, 7:11 AM CDTSevere Thunderstorm WatchSPCEast Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Tammany and 4 more6 hr
Apr 14, 5:04 PM CDTMesoscale DiscussionSPCPlaquemines, Saint Bernard56 min
Apr 13, 10:55 PM CDTMesoscale DiscussionSPCBolivar, Coahoma, Humphreys, Leflore, Quitman, Sunflower and 2 more95 min
Apr 14, 10:07 AM CDTMesoscale DiscussionSPCGeorge, Greene, Harrison, Jackson53 min
Apr 14, 10:26 AM CDTTornado WatchSPCClarke, Forrest, George, Greene, Hancock, Harrison and 5 more7 hr
Apr 14, 2:12 PM CDTMesoscale DiscussionSPCClarke, Forrest, George, Greene, Hancock, Harrison and 5 more63 min
Apr 14, 5:26 PM CDTTornado WatchSPCGeorge, Greene, Jackson, Perry, Stone, Wayne6 hr
Apr 13, 9:54 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 28 more2 hr

Nearby

Tornado Watches in Louisiana, 2007Tornado Watches in Mississippi, 2007Tornado Watches in Texas, 2007Every tornado watch in 2007

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.