Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 822

May 7, 2003Chicot County, Arkansas; 6 parishes in Louisiana; 29 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 7, 2003, 1:54 PM CDT for Chicot County, Arkansas; 6 parishes in Louisiana; 29 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 7, 2003, 1:54 PM CDT (18:54 UTC)
Expired
May 7, 2003, 4:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 36 counties

Chicot County, AR, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Attala County, MS, Carroll County, MS, Choctaw County, MS, Claiborne County, MS, Clay County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Webster 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

Jackson, MS (KJAN), launched 12:00Z, 6.9 hours before the alert went out and 64 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 2003-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1680 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 2003-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 120 square meters per square second.193958Sfc1 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
1680 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
548 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
120 m²/s²
0-3 km storm-relative helicity
180 m²/s²
Significant tornado parameter
0.7
Supercell composite
4.0

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
May 6, 7:15 PM CDTSevere Thunderstorm WatchSPCAshley, Chicot5 hr
May 6, 7:53 PM CDTMesoscale DiscussionSPCBaxter, Cleburne, Conway, Faulkner, Fulton, Garland and 19 more2 hr
May 6, 11:08 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 33 more97 min
May 6, 11:30 PM CDTTornado WatchSPCArkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 67 more6 hr
May 7, 2:27 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 64 more3 hr
May 7, 4:55 AM CDTTornado WatchSPCArkansas, Ashley, Bradley, Chicot, Crittenden, Cross and 8 more6 hr
May 7, 7:06 AM CDTMesoscale DiscussionSPCAshley, Bradley, Chicot, Desha, Drew, Phillips and 1 more114 min
May 7, 10:50 AM CDTTornado WatchSPCAshley, Chicot, Drew5 hr
May 6, 9:53 PM CDTMesoscale DiscussionSPCMadison97 min
May 7, 9:47 AM CDTMesoscale DiscussionSPCBienville, Caldwell, Catahoula, Concordia, East Carroll, Franklin and 14 more118 min
May 6, 11:50 PM CDTTornado WatchSPCAlcorn, Benton, DeSoto, Marshall, Prentiss, Tate and 4 more6 hr
May 7, 1:41 AM CDTMesoscale DiscussionSPCAlcorn, Benton, DeSoto, Marshall, Prentiss, Tate and 4 more3 hr
May 7, 7:35 AM CDTTornado WatchSPCKemper, Lauderdale, Lowndes, Monroe, Neshoba, Newton and 4 more5 hr
May 7, 1:42 PM CDTMesoscale DiscussionSPCClarke, Covington, Forrest, George, Greene, Harrison and 8 more2 hr
May 7, 3:00 PM CDTTornado WatchSPCLowndes6 hr
May 7, 6:29 PM CDTMesoscale DiscussionSPCClarke, Jasper, Lauderdale, Lowndes, Newton, Wayne91 min

Nearby

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