Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 557

April 24, 20037 parishes in Louisiana; 37 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2003, 9:39 AM CDT for 7 parishes in Louisiana; 37 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 24, 2003, 9:39 AM CDT (14:39 UTC)
Expired
Apr 24, 2003, 11:45 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 44 counties

Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Tensas Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Attala 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, Hinds 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, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Warren County, MS, Webster County, MS, Winston County, MS

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 2.7 hours before the alert went out and 49 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 2003-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 458 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 2003-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 297 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
458 J/kg
Mixed-layer CIN
-128 J/kg
Mixed-layer LCL
741 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
297 m²/s²
0-3 km storm-relative helicity
439 m²/s²
Significant tornado parameter
0.0
Supercell composite
9.3

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 23, 11:43 PM CDTMesoscale DiscussionSPCBossier, Caddo, De Soto2 hr
Apr 24, 2:41 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, De Soto, Webster2 hr
Apr 24, 6:30 AM CDTSevere Thunderstorm WatchSPCAvoyelles, Beauregard, Bienville, Caldwell, Catahoula, Concordia and 17 more5 hr
Apr 24, 6:40 AM CDTSevere Thunderstorm WatchSPCAvoyelles, Beauregard, Bienville, Caldwell, Catahoula, Concordia and 17 more4 hr
Apr 24, 11:40 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Catahoula, Concordia and 10 more65 min
Apr 24, 1:00 PM CDTTornado WatchSPCBossier, Caddo, Claiborne, Webster7 hr
Apr 24, 2:05 PM CDTTornado WatchSPCBienville, Caldwell, Catahoula, Concordia, East Carroll, Franklin and 14 more6 hr
Apr 24, 2:46 PM CDTMesoscale DiscussionSPCEast Carroll, Madison, Tensas, West Carroll119 min
Apr 24, 5:17 PM CDTMesoscale DiscussionSPCOrleans, Saint Tammany, Washington118 min
Apr 24, 6:49 PM CDTMesoscale DiscussionSPCCatahoula, Concordia, East Carroll, Franklin, Madison, Richland and 2 more56 min
Apr 24, 5:52 PM CDTMesoscale DiscussionSPCCoahoma, DeSoto, Quitman, Tate, Tunica113 min
Apr 24, 6:35 PM CDTTornado WatchSPCBolivar, Coahoma, DeSoto, Panola, Quitman, Tallahatchie and 1 more5 hr

Nearby

Mesoscale Discussions in Mississippi, 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.