Alert archive / Arkansas / Tornado Watches in 2004

Tornado Watch 858

October 18, 200421 counties in Arkansas; Dunklin County, Pemiscot County, Missouri; 18 counties in Tennessee

The Storm Prediction Center issued this tornado watch at Oct 18, 2004, 4:05 PM CDT for 21 counties in Arkansas; Dunklin County, Pemiscot County, Missouri; 18 counties in Tennessee. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Oct 18, 2004, 4:05 PM CDT (21:05 UTC)
Expired
Oct 18, 2004, 9:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 41 counties

Baxter County, AR, Clay County, AR, Cleburne County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Faulkner County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph 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, Carroll County, TN, Chester County, TN, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 100 km from the middle of the area, began a volume at 21:08 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.

Warnings issued inside it

30 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Oct 18, 4:12 PM CDTSevere Thunderstorm WarningLZKIndependence63 min
Oct 18, 4:35 PM CDTSevere Thunderstorm WarningMEGRandolph40 min
Oct 18, 4:39 PM CDTTornado WarningMEGRandolph51 min
Oct 18, 4:41 PM CDTTornado WarningMEGClay, Greene49 min
Oct 18, 5:14 PM CDTSevere Thunderstorm WarningLZKJackson31 min
Oct 18, 5:26 PM CDTSevere Thunderstorm WarningLZKIndependence34 min
Oct 18, 5:29 PM CDTTornado WarningMEGClay46 min
Oct 18, 5:37 PM CDTTornado WarningMEGGreene8 min
Oct 18, 5:44 PM CDTTornado WarningMEGDunklin46 min
Oct 18, 6:00 PM CDTTornado WarningMEGCraighead, Greene45 min
Oct 18, 6:12 PM CDTTornado WarningMEGClay18 min
Oct 18, 6:28 PM CDTTornado WarningMEGDunklin, Pemiscot47 min
Oct 18, 6:33 PM CDTSevere Thunderstorm WarningMEGLawrence12 min
Oct 18, 6:44 PM CDTTornado WarningMEGGreene31 min
Oct 18, 7:01 PM CDTTornado WarningMEGObion44 min
Oct 18, 7:13 PM CDTTornado WarningMEGGreene47 min
Oct 18, 7:21 PM CDTTornado WarningMEGChester, Henderson, McNairy24 min
Oct 18, 7:33 PM CDTTornado WarningMEGWeakley42 min
Oct 18, 7:42 PM CDTTornado WarningMEGObion18 min
Oct 18, 7:42 PM CDTTornado WarningMEGDecatur, Hardin, Henderson48 min
Oct 18, 7:46 PM CDTTornado Warning EmergencyMEGDyer44 min
Oct 18, 7:56 PM CDTTornado WarningMEGPemiscot34 min
Oct 18, 8:00 PM CDTSevere Thunderstorm WarningMEGObion30 min
Oct 18, 8:11 PM CDTTornado Warning EmergencyMEGHenry49 min
Oct 18, 8:14 PM CDTTornado WarningMEGWeakley31 min
Oct 18, 8:28 PM CDTTornado Warning EmergencyMEGDyer47 min
Oct 18, 8:38 PM CDTSevere Thunderstorm WarningMEGChester, McNairy37 min
Oct 18, 8:53 PM CDTTornado WarningMEGHenry37 min
Oct 18, 8:55 PM CDTSevere Thunderstorm WarningMEGClay, Greene, Randolph50 min
Oct 18, 8:59 PM CDTTornado Warning EmergencyMEGCrockett, Gibson46 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 9.1 hours before the alert went out and 134 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

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, 11:29 AM CDTMesoscale DiscussionSPCArkansas, Calhoun, Cleveland, Dallas, Desha, Drew and 12 more91 min
Oct 18, 2:18 PM CDTMesoscale DiscussionSPCArkansas, Calhoun, Cleveland, Dallas, Desha, Drew and 12 more57 min
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 17, 10:01 PM CDTMesoscale DiscussionSPCBenton, Bollinger, Boone, Butler, Callaway, Camden and 40 more3 hr
Oct 18, 10:20 AM CDTMesoscale DiscussionSPCBollinger, Cape Girardeau, Iron, Jefferson, Madison, Mississippi and 10 more85 min
Oct 18, 12:04 PM CDTMesoscale DiscussionSPCBenton, Bollinger, Butler, Camden, Cape Girardeau, Carter and 28 more86 min
Oct 18, 12:40 PM CDTTornado WatchSPCBollinger, Butler, Camden, Cape Girardeau, Carter, Cole and 34 more5 hr
Oct 18, 3:41 PM CDTMesoscale DiscussionSPCBollinger, Butler, Camden, Cape Girardeau, Carter, Cole and 36 more94 min
Oct 18, 5:05 PM CDTTornado WatchSPCBollinger, Butler, Cape Girardeau, Madison, Mississippi, New Madrid and 5 more5 hr
Oct 18, 6:05 PM CDTMesoscale DiscussionSPCCity of Saint Louis115 min
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

Tornado Watches in Arkansas, 2004Tornado Watches in Tennessee, 2004Tornado Watches in Missouri, 2004Every tornado watch 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.