Alert archive / Arkansas / Mesoscale Discussions in 2003

Mesoscale Discussion 378

April 4, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2003, 4:43 PM CST for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Apr 4, 2003, 4:43 PM CST (22:43 UTC)
Expired
Apr 4, 2003, 7:45 PM CST
In force
3 hr
Issued by
the Storm Prediction Center
All 69 counties

Arkansas County, AR, Calhoun County, AR, Clark County, AR, Clay County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Dunklin County, MO, Pemiscot County, MO, Benton County, MS, Bolivar County, MS, Coahoma County, MS, DeSoto County, MS, Lafayette County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union County, MS, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Little Rock radar (KLZK), 77 km from the middle of the area, began a volume at 22:42 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 10.7 hours before the alert went out and 308 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, Springfield, MO at 12:00Z on 2003-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 722 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, Springfield, MO at 12:00Z on 2003-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 383 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
722 J/kg
Mixed-layer CIN
-267 J/kg
Mixed-layer LCL
771 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
383 m²/s²
0-3 km storm-relative helicity
361 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
Apr 4, 2:58 PM CSTMesoscale DiscussionSPCAshley, Chicot2 hr
Apr 3, 8:39 PM CSTMesoscale DiscussionSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 20 more2 hr
Apr 3, 9:20 PM CSTSevere Thunderstorm WatchSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Clay and 17 more6 hr
Apr 3, 11:44 PM CSTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Caldwell, Clinton, Daviess and 13 more2 hr
Apr 4, 1:47 AM CSTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Caldwell, Clinton, Daviess and 12 more88 min
Apr 4, 7:23 AM CSTMesoscale DiscussionSPCLincoln, Pike, Saint Charles, Saint Louis, City of Saint Louis97 min
Apr 4, 11:10 AM CSTMesoscale DiscussionSPCAudrain, Benton, Boone, Callaway, Camden, Cole and 23 more95 min
Apr 4, 12:05 PM CSTTornado WatchSPCAudrain, Benton, Boone, Callaway, Camden, Carroll and 28 more5 hr
Apr 4, 1:12 PM CSTMesoscale DiscussionSPCAudrain, Boone, Callaway, Camden, Christian, Cole and 38 more93 min
Apr 4, 4:25 PM CSTTornado WatchSPCBollinger, Butler, Cape Girardeau, Carter, Crawford, Dent and 22 more6 hr

Nearby

Mesoscale Discussions in Arkansas, 2003Mesoscale Discussions in Mississippi, 2003Mesoscale Discussions in Tennessee, 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; radar from the NEXRAD Level II archive.