Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 527

April 30, 20044 counties in Arkansas; McCurtain County, Oklahoma; 25 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2004, 9:54 PM CDT for 4 counties in Arkansas; McCurtain County, Oklahoma; 25 counties in Texas. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Apr 30, 2004, 9:54 PM CDT (02:54 UTC)
Expired
Apr 30, 2004, 11:30 PM CDT
In force
96 min
Issued by
the Storm Prediction Center
All 30 counties

Howard County, AR, Little River County, AR, Pike County, AR, Sevier County, AR, McCurtain County, OK, Anderson County, TX, Bowie County, TX, Camp County, TX, Delta County, TX, Ellis County, TX, Franklin County, TX, Freestone County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Limestone County, TX, McLennan County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 176 km from the middle of the area, began a volume at 02:58 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

Fort Worth, TX (KFWD), launched 00:00Z, 2.9 hours before the alert went out and 174 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, Fort Worth, TX at 00:00Z on 2004-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2126 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, Fort Worth, TX at 00:00Z on 2004-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 131 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
2126 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1074 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
131 m²/s²
0-3 km storm-relative helicity
157 m²/s²
Significant tornado parameter
1.3
Supercell composite
6.8

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 30, 7:06 PM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Franklin, Logan, Madison and 3 more114 min
Apr 30, 7:22 PM CDTMesoscale DiscussionSPCHempstead, Howard, Little River, Miller, Sevier83 min
Apr 30, 7:40 PM CDTSevere Thunderstorm WatchSPCHoward, Little River, Pike, Sevier5 hr
Apr 30, 9:05 PM CDTSevere Thunderstorm WatchSPCBenton, Crawford, Sebastian, Washington5 hr
Apr 30, 11:45 PM CDTMesoscale DiscussionSPCBenton, Crawford, Sebastian, Washington90 min
May 1, 12:50 AM CDTSevere Thunderstorm WatchSPCColumbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more6 hr
May 1, 1:11 AM CDTMesoscale DiscussionSPCCrawford, Sebastian, Washington64 min
May 1, 2:38 AM CDTMesoscale DiscussionSPCBradley, Calhoun, Columbia, Hempstead, Lafayette, Miller and 3 more37 min
May 1, 3:10 AM CDTSevere Thunderstorm WatchSPCAshley, Bradley, Calhoun, Cleveland, Columbia, Dallas and 5 more6 hr
May 1, 5:13 AM CDTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Cleveland, Columbia, Dallas and 5 more92 min
Apr 30, 8:14 PM CDTMesoscale DiscussionSPCBryan, Carter, Jefferson, Love, Marshall91 min
Apr 30, 7:00 PM CDTMesoscale DiscussionSPCBosque, Brown, Coleman, Comanche, Concho, Eastland and 11 more90 min
Apr 30, 9:07 PM CDTMesoscale DiscussionSPCBosque, Brown, Comanche, Coryell, Erath, Hamilton and 8 more53 min
Apr 30, 10:34 PM CDTMesoscale DiscussionSPCBrown, Coleman, Concho, Crockett, Edwards, Irion and 15 more86 min
Apr 30, 11:35 PM CDTSevere Thunderstorm WatchSPCBlanco, Concho, Crockett, Edwards, Gillespie, Irion and 13 more5 hr
Apr 30, 11:56 PM CDTMesoscale DiscussionSPCChambers, Galveston, Grimes, Hardin, Harris, Jasper and 10 more94 min
May 1, 1:34 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Blanco, Comal, Concho and 24 more86 min
May 1, 1:49 AM CDTMesoscale DiscussionSPCAnderson, Bell, Cherokee, Falls, Freestone, Henderson and 5 more86 min
May 1, 3:28 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Blanco, Concho, Crockett and 23 more92 min
May 1, 3:41 AM CDTMesoscale DiscussionSPCAustin, Brazoria, Brazos, Burleson, Chambers, Colorado and 18 more64 min
May 1, 3:50 AM CDTTornado WatchSPCAngelina, Austin, Bastrop, Brazos, Burleson, Chambers and 25 more6 hr
May 1, 5:40 AM CDTSevere Thunderstorm WatchSPCAtascosa, Bee, Bexar, Caldwell, DeWitt, Dimmit and 17 more6 hr
May 1, 6:08 AM CDTMesoscale DiscussionSPCAngelina, Austin, Brazos, Burleson, Chambers, Colorado and 24 more97 min
May 1, 7:24 AM CDTMesoscale DiscussionSPCSabine, San Augustine, Shelby96 min
May 1, 7:33 AM CDTMesoscale DiscussionSPCAtascosa, Bee, Bexar, Caldwell, DeWitt, Dimmit and 16 more87 min
May 1, 7:47 AM CDTMesoscale DiscussionSPCAustin, Bastrop, Brazos, Burleson, Chambers, Colorado and 23 more88 min
May 1, 9:16 AM CDTMesoscale DiscussionSPCBrazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 3 more59 min
May 1, 9:36 AM CDTMesoscale DiscussionSPCNueces114 min
May 1, 9:45 AM CDTTornado WatchSPCBrazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 6 more5 hr
May 1, 9:55 AM CDTSevere Thunderstorm WatchSPCBrooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Kleberg and 3 more5 hr
May 1, 11:15 AM CDTMesoscale DiscussionSPCKenedy2 hr
May 1, 1:14 PM CDTMesoscale DiscussionSPCWillacy2 hr

Nearby

Mesoscale Discussions in Texas, 2004Mesoscale Discussions in Arkansas, 2004Mesoscale Discussions in Oklahoma, 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.