Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 422

April 6, 20035 states

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2003, 6:23 PM CDT for 5 states. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
Apr 6, 2003, 6:23 PM CDT (23:23 UTC)
Expired
Apr 6, 2003, 8:00 PM CDT
In force
97 min
Issued by
the Storm Prediction Center
All 107 counties

Bibb County, AL, Blount County, AL, Choctaw County, AL, Cullman County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lawrence County, AL, Marengo County, AL, Marion County, AL, Morgan County, AL, Perry County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Ashley County, AR, Chicot County, AR, Union County, AR, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Carroll 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, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clarke County, MS, Clay County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Itawamba County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lee County, MS, Leflore County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Tallahatchie County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Wilkinson County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS, Newton County, TX, Sabine County, TX

The watches that followed

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

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 11.4 hours before the alert went out and 14 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, Jackson, MS at 12:00Z on 2003-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 758 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, Jackson, MS at 12:00Z on 2003-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 112 square meters per square second.1939587897117Sfc1 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
758 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
544 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
112 m²/s²
0-3 km storm-relative helicity
168 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

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, 9:19 AM CDTMesoscale DiscussionSPCLimestone, Madison116 min
Apr 6, 12:40 PM CDTMesoscale DiscussionSPCGreene, Hale, Marengo, Perry, Pickens, Sumter and 1 more2 hr
Apr 6, 1:20 PM CDTSevere Thunderstorm WatchSPCLauderdale6 hr
Apr 6, 1:35 PM CDTTornado WatchSPCBibb, Butler, Chilton, Choctaw, Clarke, Dallas and 8 more5 hr
Apr 6, 2:56 PM CDTMesoscale DiscussionSPCBibb, Chilton, Dallas, Greene, Hale, Perry and 4 more2 hr
Apr 6, 6:50 PM CDTTornado WatchSPCAutauga, Bibb, Chilton, Choctaw, Cullman, Dallas and 12 more6 hr
Apr 6, 7:38 AM CDTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Chicot, Columbia, Lafayette and 3 more97 min
Apr 6, 7:50 AM CDTSevere Thunderstorm WatchSPCAshley, Bradley, Calhoun, Chicot, Columbia, Drew and 6 more5 hr
Apr 6, 8:56 AM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 21 more2 hr
Apr 6, 9:45 AM CDTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Carroll, Conway, Crawford and 22 more5 hr
Apr 6, 10:00 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Chicot, Desha, Drew, Jefferson and 4 more2 hr
Apr 6, 10:20 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 21 more55 min
Apr 6, 10:30 AM CDTTornado WatchSPCAshley, Bradley, Calhoun, Chicot, Columbia, Drew and 6 more6 hr
Apr 6, 11:05 AM CDTSevere Thunderstorm WatchSPCArkansas, Baxter, Cleburne, Cleveland, Craighead, Crittenden and 27 more5 hr
Apr 6, 12:27 PM CDTMesoscale DiscussionSPCArkansas, Clark, Cleburne, Cleveland, Conway, Craighead and 46 more2 hr
Apr 6, 2:18 PM CDTMesoscale DiscussionSPCBoone, Conway, Crawford, Franklin, Garland, Howard and 16 more57 min
Apr 6, 2:55 PM CDTSevere Thunderstorm WatchSPCBaxter, Boone, Clark, Cleburne, Conway, Crawford and 35 more5 hr
Apr 6, 3:45 PM CDTTornado WatchSPCAshley, Chicot, Union5 hr
Apr 6, 5:35 PM CDTMesoscale DiscussionSPCAshley, Chicot, Union115 min
Apr 6, 12:03 PM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 14 more117 min
Apr 6, 3:26 PM CDTMesoscale DiscussionSPCBienville, Caldwell, De Soto, Franklin, Grant, Jackson and 11 more2 hr
Apr 5, 6:11 PM CSTMesoscale DiscussionSPCBaylor, Briscoe, Cottle, Crosby, Dickens, Floyd and 9 more64 min
Apr 5, 6:35 PM CSTMesoscale DiscussionSPCArcher, Clay, Collin, Cooke, Dallas, Delta and 23 more115 min
Apr 5, 6:40 PM CSTTornado WatchSPCBriscoe, Childress, Cottle, Crosby, Dickens, Fisher and 16 more5 hr
Apr 5, 8:04 PM CSTMesoscale DiscussionSPCArcher, Baylor, Clay, Collin, Cooke, Dallas and 25 more116 min
Apr 5, 9:20 PM CSTMesoscale DiscussionSPCArcher, Camp, Clay, Collin, Cooke, Dallas and 31 more55 min
Apr 5, 9:35 PM CSTTornado WatchSPCArcher, Bowie, Camp, Cass, Clay, Collin and 38 more5 hr
Apr 5, 10:26 PM CSTMesoscale DiscussionSPCBaylor, Childress, Cottle, Dickens, Fisher, Foard and 11 more64 min
Apr 5, 11:43 PM CSTMesoscale DiscussionSPCArcher, Camp, Clay, Collin, Cooke, Dallas and 31 more92 min
Apr 6, 3:13 AM CDTMesoscale DiscussionSPCArcher, Baylor, Camp, Cass, Cherokee, Clay and 39 more107 min
Apr 6, 3:39 AM CDTMesoscale DiscussionSPCArcher, Baylor, Camp, Cass, Cherokee, Clay and 39 more66 min
Apr 6, 4:50 AM CDTMesoscale DiscussionSPCArcher, Baylor, Brown, Callahan, Coke, Coleman and 27 more115 min
Apr 6, 5:35 AM CDTSevere Thunderstorm WatchSPCWichita4 hr
Apr 6, 9:12 AM CDTMesoscale DiscussionSPCAnderson, Bosque, Camp, Cass, Cherokee, Collin and 41 more2 hr
Apr 6, 12:40 PM CDTTornado WatchSPCAnderson, Brazos, Burleson, Cherokee, Collin, Cooke and 33 more5 hr
Apr 6, 3:00 PM CDTMesoscale DiscussionSPCAnderson, Brazos, Cherokee, Delta, Freestone, Grimes and 21 more90 min

Nearby

Mesoscale Discussions in Mississippi, 2003Mesoscale Discussions in Louisiana, 2003Mesoscale Discussions in Alabama, 2003Every mesoscale discussion in 2003

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.