Alert archive / Mississippi / Mesoscale Discussions in 2005

Mesoscale Discussion 501

April 6, 20056 counties in Alabama; 33 parishes in Louisiana; 38 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2005, 9:29 AM CDT for 6 counties in Alabama; 33 parishes in Louisiana; 38 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 6, 2005, 9:29 AM CDT (14:29 UTC)
Expired
Apr 6, 2005, 11:30 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 77 counties

Choctaw County, AL, Greene County, AL, Mobile County, AL, Pickens County, AL, Sumter County, AL, Washington County, AL, Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Rapides 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, Vermilion Parish, LA, Vernon Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Hinds County, MS, Jackson 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, Lincoln County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS, Wilkinson County, MS

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 2.5 hours before the alert went out and 136 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 2005-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1199 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 2005-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 199 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
1199 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
645 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
199 m²/s²
0-3 km storm-relative helicity
279 m²/s²
Significant tornado parameter
1.2
Supercell composite
8.1

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 6, 7:00 AM CDTTornado WatchSPCChoctaw, Greene, Mobile, Pickens, Sumter, Washington6 hr
Apr 6, 10:50 AM CDTMesoscale DiscussionSPCBaldwin, Butler, Clarke, Coffee, Conecuh, Covington and 9 more55 min
Apr 6, 11:05 AM CDTTornado WatchSPCAutauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 20 more8 hr
Apr 6, 1:21 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 20 more84 min
Apr 6, 3:43 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 20 more92 min
Apr 6, 4:53 PM CDTMesoscale DiscussionSPCBibb, Blount, Chilton, Colbert, Coosa, Cullman and 19 more37 min
Apr 6, 5:20 PM CDTTornado WatchSPCBibb, Chilton, Cullman, Fayette, Greene, Hale and 8 more8 hr
Apr 6, 6:01 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 21 more59 min
Apr 6, 6:45 PM CDTTornado WatchSPCAutauga, Bibb, Butler, Chilton, Choctaw, Clarke and 20 more6 hr
Apr 5, 8:25 PM CDTSevere Thunderstorm WatchSPCBossier, Caddo8 hr
Apr 5, 10:40 PM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 50 more2 hr
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, 7:46 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 20 more119 min
Apr 6, 10:40 AM CDTMesoscale DiscussionSPCCaldwell, Catahoula, East Carroll, Franklin, Grant, Jackson and 11 more65 min
Apr 6, 11:05 AM CDTTornado WatchSPCAscension, Assumption, Concordia, East Baton Rouge, East Carroll, East Feliciana and 22 more8 hr
Apr 6, 1:55 PM CDTTornado WatchSPCBenton, Calhoun, Chickasaw, Coahoma, DeSoto, Lafayette and 12 more7 hr
Apr 6, 3:18 PM CDTMesoscale DiscussionSPCBenton, Calhoun, Chickasaw, Coahoma, DeSoto, Lafayette and 12 more87 min
Apr 6, 5:44 PM CDTMesoscale DiscussionSPCBenton, Calhoun, Chickasaw, Coahoma, DeSoto, Lafayette and 12 more91 min

Nearby

Mesoscale Discussions in Mississippi, 2005Mesoscale Discussions in Louisiana, 2005Mesoscale Discussions in Alabama, 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.