Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 1805

July 13, 200318 counties in Alabama; 10 parishes in Louisiana; 51 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2003, 11:02 AM CDT for 18 counties in Alabama; 10 parishes in Louisiana; 51 counties in Mississippi. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
Jul 13, 2003, 11:02 AM CDT (16:02 UTC)
Expired
Jul 13, 2003, 1:00 PM CDT
In force
118 min
Issued by
the Storm Prediction Center
All 79 counties

Bibb County, AL, Choctaw County, AL, Clarke County, AL, Dallas County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Lamar County, AL, Lowndes County, AL, Marengo County, AL, Marion County, AL, Perry County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Wilcox County, AL, Winston County, AL, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Adams 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, Warren County, MS, Washington County, MS, Wayne County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo 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

Jackson, MS (KJAN), launched 12:00Z, 4.0 hours before the alert went out and 135 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 2003-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2739 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 2003-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 square meters per square second.1939Sfc1 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
2739 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
691 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
31 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Jul 13, 11:55 AM CDTSevere Thunderstorm WatchSPCColbert, Lauderdale6 hr
Jul 13, 3:05 PM CDTSevere Thunderstorm WatchSPCBlount, Calhoun, Cherokee, Cullman, DeKalb, Etowah and 12 more5 hr
Jul 13, 3:53 PM CDTMesoscale DiscussionSPCColbert, Lauderdale67 min
Jul 13, 5:26 PM CDTMesoscale DiscussionSPCJackson94 min
Jul 13, 5:55 PM CDTSevere Thunderstorm WatchSPCColbert, Franklin, Lamar, Lauderdale, Lawrence, Limestone and 1 more4 hr
Jul 13, 1:41 PM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 10 more2 hr
Jul 13, 1:55 PM CDTSevere Thunderstorm WatchSPCBienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 19 more5 hr
Jul 13, 4:33 PM CDTMesoscale DiscussionSPCBienville, Caldwell, Catahoula, Concordia, De Soto, Franklin and 10 more87 min
Jul 13, 11:30 AM CDTMesoscale DiscussionSPCAlcorn, Benton, Bolivar, Coahoma, DeSoto, Lafayette and 12 more2 hr

Nearby

Mesoscale Discussions in Mississippi, 2003Mesoscale Discussions in Alabama, 2003Mesoscale Discussions in Louisiana, 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.