Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 2518

November 18, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Nov 18, 2003, 6:08 AM CST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Nov 18, 2003, 6:08 AM CST (12:08 UTC)
Expired
Nov 18, 2003, 8:15 AM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 80 counties

Choctaw County, AL, Colbert County, AL, Franklin County, AL, Lamar County, AL, Marion County, AL, Pickens County, AL, Sumter County, AL, Ascension Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Alcorn County, MS, Attala County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, Choctaw County, MS, Clarke County, MS, Clay County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Itawamba County, MS, Jackson County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lafayette County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lee County, MS, Lowndes County, MS, Marion County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Pontotoc County, MS, Prentiss County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Walthall County, MS, Wayne County, MS, Webster County, MS, Winston County, MS, Chester County, TN, Fayette County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, McNairy County, TN, Wayne County, TN

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, 0.1 hours before the alert went out and 74 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 2003-11-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 211 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 2003-11-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 295 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
211 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
701 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
295 m²/s²
0-3 km storm-relative helicity
385 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.6

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
Nov 18, 6:55 AM CSTTornado WatchSPCChoctaw, Colbert, Fayette, Franklin, Greene, Lamar and 9 more5 hr
Nov 18, 8:58 AM CSTMesoscale DiscussionSPCBaldwin, Butler, Coffee, Conecuh, Covington, Crenshaw and 4 more92 min
Nov 18, 10:30 AM CSTMesoscale DiscussionSPCBaldwin, Bibb, Blount, Butler, Chilton, Choctaw and 26 more90 min
Nov 18, 11:25 AM CSTTornado WatchSPCAutauga, Baldwin, Bibb, Blount, Butler, Calhoun and 38 more6 hr
Nov 18, 1:33 PM CSTMesoscale DiscussionSPCDeKalb, Jackson, Madison57 min
Nov 18, 1:55 PM CSTTornado WatchSPCDeKalb, Jackson5 hr
Nov 18, 1:59 PM CSTMesoscale DiscussionSPCAutauga, Barbour, Bullock, Butler, Calhoun, Chambers and 23 more91 min
Nov 18, 4:31 PM CSTMesoscale DiscussionSPCBarbour, Bullock, Butler, Chambers, Clay, Cleburne and 16 more29 min
Nov 18, 4:55 PM CSTTornado WatchSPCBarbour, Bullock, Chambers, Coffee, Covington, Crenshaw and 11 more5 hr
Nov 17, 7:48 PM CSTMesoscale DiscussionSPCBossier, Caddo, Claiborne, Webster87 min
Nov 17, 8:10 PM CSTMesoscale DiscussionSPCBeauregard, Calcasieu, Natchitoches, Sabine, Vernon95 min
Nov 17, 9:25 PM CSTTornado WatchSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 12 more7 hr
Nov 17, 10:53 PM CSTMesoscale DiscussionSPCBeauregard, Calcasieu97 min
Nov 17, 11:44 PM CSTMesoscale DiscussionSPCBienville, Bossier, Caldwell, Claiborne, De Soto, Grant and 11 more91 min
Nov 17, 11:50 PM CSTTornado WatchSPCAcadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 2 more5 hr
Nov 18, 2:08 AM CSTMesoscale DiscussionSPCAscension, Assumption, Avoyelles, Catahoula, Concordia, East Baton Rouge and 25 more97 min
Nov 18, 2:25 AM CSTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 32 more6 hr
Nov 18, 4:48 AM CSTMesoscale DiscussionSPCAscension, Assumption, Concordia, East Baton Rouge, East Feliciana, Iberville and 17 more117 min
Nov 18, 1:29 AM CSTMesoscale DiscussionSPCBolivar, Coahoma, DeSoto, Leflore, Marshall, Panola and 5 more3 hr
Nov 18, 1:55 AM CSTTornado WatchSPCBolivar, Coahoma, DeSoto, Holmes, Humphreys, Leflore and 7 more6 hr
Nov 18, 2:50 PM CSTSevere Thunderstorm WatchSPCBolivar, Washington5 hr
Nov 18, 3:26 PM CSTMesoscale DiscussionSPCAnderson, Bradley, Campbell, Cumberland, Fentress, Loudon and 8 more94 min
Nov 18, 4:58 PM CSTMesoscale DiscussionSPCAnderson, Bledsoe, Blount, Bradley, Cocke, Cumberland and 20 more32 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.