Alert archive / Louisiana / Mesoscale Discussions in 2005

Mesoscale Discussion 496

April 5, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2005, 10:40 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 5, 2005, 10:40 PM CDT (03:40 UTC)
Expired
Apr 6, 2005, 12:45 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 85 counties

Ashley County, AR, Bradley County, AR, Union County, AR, Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Claiborne 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, Iberia Parish, LA, Iberville Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Livingston Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Orleans Parish, LA, Ouachita Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Union Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Washington Parish, LA, Webster Parish, LA, West Baton Rouge Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Issaquena County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Pike County, MS, Rankin County, MS, Sharkey County, MS, Simpson County, MS, Walthall County, MS, Warren County, MS, Wilkinson County, MS, Jasper County, TX, Newton County, TX, Orange County, TX, Sabine County, TX

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 3.7 hours before the alert went out and 180 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, Lake Charles Mun, LA at 00:00Z on 2005-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 260 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, Lake Charles Mun, LA at 00:00Z on 2005-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 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
260 J/kg
Mixed-layer CIN
-235 J/kg
Mixed-layer LCL
959 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
140 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 5, 8:25 PM CDTSevere Thunderstorm WatchSPCColumbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more8 hr
Apr 5, 8:30 PM CDTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Carroll, Clark, Conway and 27 more5 hr
Apr 5, 11:41 PM CDTMesoscale DiscussionSPCArkansas, Baxter, Calhoun, Cleburne, Cleveland, Conway and 31 more34 min
Apr 6, 7:46 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 30 more119 min
Apr 6, 10:40 AM CDTMesoscale DiscussionSPCAshley, Chicot, Desha, Drew65 min
Apr 6, 12:46 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 17 more119 min
Apr 6, 1:55 PM CDTTornado WatchSPCBaxter, Clay, Cleburne, Craighead, Crittenden, Cross and 19 more7 hr
Apr 6, 3:18 PM CDTMesoscale DiscussionSPCBaxter, Clay, Cleburne, Craighead, Crittenden, Cross and 19 more87 min
Apr 6, 5:44 PM CDTMesoscale DiscussionSPCArkansas, Baxter, Clay, Cleburne, Craighead, Crittenden and 20 more91 min
Apr 6, 2:55 AM CDTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 36 more7 hr
Apr 6, 5:45 AM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 36 more90 min
Apr 6, 7:00 AM CDTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Cameron and 27 more6 hr
Apr 6, 9:29 AM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Cameron and 27 more2 hr
Apr 6, 11:05 AM CDTTornado WatchSPCAscension, Assumption, Concordia, East Baton Rouge, East Carroll, East Feliciana and 22 more8 hr
Apr 6, 1:21 PM CDTMesoscale DiscussionSPCAscension, Assumption, Concordia, East Baton Rouge, East Carroll, East Feliciana and 22 more84 min
Apr 6, 3:43 PM CDTMesoscale DiscussionSPCAscension, Assumption, Concordia, East Baton Rouge, East Carroll, East Feliciana and 22 more92 min
Apr 6, 6:01 PM CDTMesoscale DiscussionSPCOrleans, Saint Bernard, Saint Tammany, Washington59 min
Apr 6, 6:45 PM CDTTornado WatchSPCWashington6 hr
Apr 6, 11:05 AM CDTTornado WatchSPCGeorge, Greene, Harrison, Jackson, Wayne8 hr
Apr 6, 4:53 PM CDTMesoscale DiscussionSPCAlcorn, Tishomingo37 min
Apr 5, 7:10 PM CDTMesoscale DiscussionSPCBell, Brazos, Burleson, Falls, Grimes, Houston and 10 more65 min
Apr 6, 12:15 AM CDTMesoscale DiscussionSPCAransas, Bee, Brazoria, Calhoun, Chambers, Colorado and 20 more90 min

Nearby

Mesoscale Discussions in Louisiana, 2005Mesoscale Discussions in Mississippi, 2005Mesoscale Discussions in Texas, 2005Every mesoscale discussion 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.