Alert archive / Texas / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 139

May 1, 20047 counties in Arkansas; Bossier Parish, Caddo Parish, Louisiana; 53 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 1, 2004, 12:50 AM CDT for 7 counties in Arkansas; Bossier Parish, Caddo Parish, Louisiana; 53 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: May 1, 2004, 12:50 AM CDT (05:50 UTC)
Expired: May 1, 2004, 7:00 AM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 62 counties

Columbia County, AR, Hempstead County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Bossier Parish, LA, Caddo Parish, LA, Anderson County, TX, Bell County, TX, Bosque County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Collin County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Falls County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Grayson County, TX, Gregg County, TX, Hamilton County, TX, Harrison County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, Marion County, TX, McLennan County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Panola County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rockwall County, TX, Rusk County, TX, San Saba County, TX, Smith County, TX, Somervell County, TX, Tarrant County, TX, Titus County, TX, Trinity County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 94 km from the middle of the area, began a volume at 05:54 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

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

Issued	Product	Office	Counties	Lasted
May 1, 12:51 AM CDT	Severe Thunderstorm Warning	FWD	Henderson	39 min
May 1, 1:00 AM CDT	Severe Thunderstorm Warning	SHV	Upshur	60 min
May 1, 1:04 AM CDT	Flash Flood Warning	FWD	Henderson, Navarro	3 hr
May 1, 1:08 AM CDT	Severe Thunderstorm Warning	SHV	Morris	52 min
May 1, 1:20 AM CDT	Severe Thunderstorm Warning	SHV	Cass	55 min
May 1, 1:29 AM CDT	Severe Thunderstorm Warning	SHV	Bowie	61 min
May 1, 1:33 AM CDT	Severe Thunderstorm Warning	SHV	Marion	57 min
May 1, 1:41 AM CDT	Severe Thunderstorm Warning	SHV	Smith	64 min
May 1, 1:58 AM CDT	Severe Thunderstorm Warning	FWD	Henderson, Navarro	62 min
May 1, 2:01 AM CDT	Severe Thunderstorm Warning	SHV	Miller	59 min
May 1, 2:05 AM CDT	Flash Flood Warning	FWD	McLennan	3 hr
May 1, 2:11 AM CDT	Severe Thunderstorm Warning	SHV	Little River	64 min
May 1, 2:32 AM CDT	Severe Thunderstorm Warning	SHV	Lafayette	58 min
May 1, 2:45 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead	60 min
May 1, 3:08 AM CDT	Severe Thunderstorm Warning	SHV	Smith	52 min
May 1, 3:17 AM CDT	Severe Thunderstorm Warning	SHV	Gregg	58 min
May 1, 3:26 AM CDT	Severe Thunderstorm Warning	SHV	Rusk	64 min
May 1, 3:28 AM CDT	Flash Flood Warning	SHV	Smith	4 hr
May 1, 3:35 AM CDT	Severe Thunderstorm Warning	SHV	Cherokee	55 min
May 1, 3:48 AM CDT	Severe Thunderstorm Warning	SHV	Harrison	57 min
May 1, 3:50 AM CDT	Flash Flood Warning	FWD	Henderson, Navarro	3 hr
May 1, 3:54 AM CDT	Severe Thunderstorm Warning	SHV	Panola	66 min
May 1, 4:41 AM CDT	Flash Flood Warning	SHV	Rusk	3 hr
May 1, 4:50 AM CDT	Flash Flood Warning	FWD	McLennan	3 hr
May 1, 5:43 AM CDT	Flash Flood Warning	SHV	Cherokee	3 hr
May 1, 6:38 AM CDT	Flash Flood Warning	FWD	Anderson	3 hr

Discussions around it

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

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 5.8 hours before the alert went out and 110 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 30, 7:06 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Crawford, Franklin, Logan, Madison and 3 more	114 min
Apr 30, 7:22 PM CDT	Mesoscale Discussion	SPC	Hempstead, Howard, Little River, Miller, Sevier	83 min
Apr 30, 7:40 PM CDT	Severe Thunderstorm Watch	SPC	Howard, Little River, Pike, Sevier	5 hr
Apr 30, 9:05 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Crawford, Sebastian, Washington	5 hr
Apr 30, 9:54 PM CDT	Mesoscale Discussion	SPC	Howard, Little River, Pike, Sevier	96 min
Apr 30, 11:45 PM CDT	Mesoscale Discussion	SPC	Benton, Crawford, Sebastian, Washington	90 min
May 1, 1:11 AM CDT	Mesoscale Discussion	SPC	Crawford, Sebastian, Washington	64 min
May 1, 2:38 AM CDT	Mesoscale Discussion	SPC	Bradley, Calhoun, Columbia, Hempstead, Lafayette, Miller and 3 more	37 min
May 1, 3:10 AM CDT	Severe Thunderstorm Watch	SPC	Ashley, Bradley, Calhoun, Cleveland, Columbia, Dallas and 5 more	6 hr
May 1, 5:13 AM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Cleveland, Columbia, Dallas and 5 more	92 min
Apr 30, 11:56 PM CDT	Mesoscale Discussion	SPC	Beauregard, Calcasieu, Cameron, Jefferson Davis	94 min
May 1, 7:24 AM CDT	Mesoscale Discussion	SPC	Natchitoches, Sabine, Winn	96 min
May 1, 9:45 AM CDT	Tornado Watch	SPC	Allen, Beauregard, Calcasieu, Cameron, Jefferson Davis, Vernon	5 hr
May 1, 1:45 PM CDT	Mesoscale Discussion	SPC	East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena, Saint Tammany and 3 more	3 hr
May 1, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	Washington	5 hr
Apr 30, 7:00 PM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Coleman, Comanche, Concho, Eastland and 11 more	90 min
Apr 30, 8:14 PM CDT	Mesoscale Discussion	SPC	Archer, Clay, Collin, Cooke, Denton, Grayson and 8 more	91 min
Apr 30, 9:07 PM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Comanche, Coryell, Erath, Hamilton and 8 more	53 min
Apr 30, 10:34 PM CDT	Mesoscale Discussion	SPC	Brown, Coleman, Concho, Crockett, Edwards, Irion and 15 more	86 min
Apr 30, 11:35 PM CDT	Severe Thunderstorm Watch	SPC	Blanco, Concho, Crockett, Edwards, Gillespie, Irion and 13 more	5 hr
May 1, 1:34 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bexar, Blanco, Comal, Concho and 24 more	86 min
May 1, 1:49 AM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Cherokee, Falls, Freestone, Henderson and 5 more	86 min
May 1, 3:28 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bexar, Blanco, Concho, Crockett and 23 more	92 min
May 1, 3:41 AM CDT	Mesoscale Discussion	SPC	Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 18 more	64 min
May 1, 3:50 AM CDT	Tornado Watch	SPC	Angelina, Austin, Bastrop, Brazos, Burleson, Chambers and 25 more	6 hr
May 1, 5:40 AM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bee, Bexar, Caldwell, DeWitt, Dimmit and 17 more	6 hr
May 1, 6:08 AM CDT	Mesoscale Discussion	SPC	Angelina, Austin, Brazos, Burleson, Chambers, Colorado and 24 more	97 min
May 1, 7:33 AM CDT	Mesoscale Discussion	SPC	Atascosa, Bee, Bexar, Caldwell, DeWitt, Dimmit and 16 more	87 min
May 1, 7:47 AM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Brazos, Burleson, Chambers, Colorado and 23 more	88 min
May 1, 9:16 AM CDT	Mesoscale Discussion	SPC	Brazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 3 more	59 min
May 1, 9:36 AM CDT	Mesoscale Discussion	SPC	Nueces	114 min
May 1, 9:55 AM CDT	Severe Thunderstorm Watch	SPC	Brooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Kleberg and 3 more	5 hr
May 1, 11:15 AM CDT	Mesoscale Discussion	SPC	Kenedy	2 hr
May 1, 1:14 PM CDT	Mesoscale Discussion	SPC	Willacy	2 hr

Nearby

Severe Thunderstorm Watches in Texas, 2004 Severe Thunderstorm Watches in Arkansas, 2004 Severe Thunderstorm Watches in Louisiana, 2004 Every severe thunderstorm 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.