Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 803

May 6, 200311 counties in Alabama; 11 parishes in Louisiana; 30 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 6, 2003, 5:48 PM CDT for 11 counties in Alabama; 11 parishes in Louisiana; 30 counties in Mississippi. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
May 6, 2003, 5:48 PM CDT (22:48 UTC)
Expired
May 6, 2003, 8:45 PM CDT
In force
3 hr
Issued by
the Storm Prediction Center
All 52 counties

Bibb County, AL, Chilton County, AL, Coosa County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, Sumter County, AL, Tuscaloosa County, AL, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Adams County, MS, Attala County, MS, Choctaw County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Warren County, MS, Winston 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

Birmingham, AL (KBMX), launched 12:00Z, 10.8 hours before the alert went out and 224 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, Birmingham, AL at 12:00Z on 2003-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1558 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, Birmingham, AL at 12:00Z on 2003-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 287 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
1558 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
599 m above ground
0-6 km bulk shear
68 kt
0-1 km storm-relative helicity
287 m²/s²
0-3 km storm-relative helicity
375 m²/s²
Significant tornado parameter
3.3
Supercell composite
12.2

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
May 5, 7:53 PM CDTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Clay, Cleburne, Colbert and 20 more2 hr
May 5, 9:05 PM CDTTornado WatchSPCBibb, Blount, Calhoun, Chambers, Cherokee, Clay and 17 more7 hr
May 5, 10:27 PM CDTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Cleburne, Cullman, DeKalb and 12 more2 hr
May 6, 1:26 AM CDTMesoscale DiscussionSPCBlount, Calhoun, Chambers, Cherokee, Clay, Cleburne and 17 more3 hr
May 6, 1:50 AM CDTTornado WatchSPCBlount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 14 more6 hr
May 6, 5:06 AM CDTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 9 more3 hr
May 6, 7:40 AM CDTTornado WatchSPCBlount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 16 more5 hr
May 6, 10:26 AM CDTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 15 more2 hr
May 6, 12:15 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 18 more90 min
May 6, 12:30 PM CDTTornado WatchSPCBibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 22 more7 hr
May 6, 3:41 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 20 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.