Alert archive / Mississippi / Mesoscale Discussions in 2004

Mesoscale Discussion 2323

October 18, 200418 counties in Arkansas; 21 counties in Mississippi; 4 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Oct 18, 2004, 11:29 AM CDT for 18 counties in Arkansas; 21 counties in Mississippi; 4 counties in Tennessee. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Oct 18, 2004, 11:29 AM CDT (16:29 UTC)
Expired
Oct 18, 2004, 1:00 PM CDT
In force
91 min
Issued by
the Storm Prediction Center
All 43 counties

Arkansas County, AR, Calhoun County, AR, Cleveland County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Monroe County, AR, Ouachita County, AR, Phillips County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, Alcorn County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Chickasaw County, MS, Coahoma County, MS, DeSoto County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union County, MS, Yalobusha County, MS, Fayette County, TN, Hardeman County, TN, McNairy County, TN, Shelby County, TN

The radar

The Little Rock radar (KLZK), 118 km from the middle of the area, began a volume at 16:30 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 nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 4.5 hours before the alert went out and 106 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, Little Rock, AR at 12:00Z on 2004-10-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1504 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, Little Rock, AR at 12:00Z on 2004-10-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 390 square meters per square second.1939587897Sfc1 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
1504 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
520 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
390 m²/s²
0-3 km storm-relative helicity
482 m²/s²
Significant tornado parameter
3.3
Supercell composite
16.6

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
Oct 17, 11:30 PM CDTSevere Thunderstorm WatchSPCBaxter, Clay, Fulton, Greene, Marion, Randolph and 1 more6 hr
Oct 18, 2:19 AM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Clark, Clay and 42 more56 min
Oct 18, 4:40 AM CDTMesoscale DiscussionSPCClay, Greene, Randolph, Sharp35 min
Oct 18, 7:44 AM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 43 more61 min
Oct 18, 9:45 AM CDTTornado WatchSPCArkansas, Calhoun, Cleveland, Dallas, Desha, Drew and 12 more5 hr
Oct 18, 2:18 PM CDTMesoscale DiscussionSPCArkansas, Calhoun, Cleveland, Dallas, Desha, Drew and 12 more57 min
Oct 18, 4:05 PM CDTTornado WatchSPCBaxter, Clay, Cleburne, Craighead, Crittenden, Cross and 15 more5 hr
Oct 18, 5:21 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 22 more114 min
Oct 18, 5:50 PM CDTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 20 more5 hr
Oct 18, 1:55 PM CDTMesoscale DiscussionSPCStewart95 min
Oct 18, 3:20 PM CDTTornado WatchSPCFranklin, Giles, Lincoln5 hr
Oct 18, 6:02 PM CDTMesoscale DiscussionSPCFranklin, Giles, Lawrence, Lincoln, Moore, Wayne88 min

Nearby

Mesoscale Discussions in Mississippi, 2004Mesoscale Discussions in Arkansas, 2004Mesoscale Discussions in Tennessee, 2004Every mesoscale discussion in 2004

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.