Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 541

May 1, 200422 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 1, 2004, 7:33 AM CDT for 22 counties in Texas. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
May 1, 2004, 7:33 AM CDT (12:33 UTC)
Expired
May 1, 2004, 9:00 AM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 22 counties

Atascosa County, TX, Bee County, TX, Bexar County, TX, Caldwell County, TX, DeWitt County, TX, Dimmit County, TX, Duval County, TX, Frio County, TX, Goliad County, TX, Gonzales County, TX, Guadalupe County, TX, Jim Wells County, TX, Karnes County, TX, La Salle County, TX, Live Oak County, TX, McMullen County, TX, Medina County, TX, Nueces County, TX, San Patricio County, TX, Webb County, TX, Wilson County, TX, Zavala County, TX

The radar

The Austin/San Antonio radar (KEWX), 153 km from the middle of the area, began a volume at 12:35 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

Corpus Christi, TX (KCRP), launched 12:00Z, 0.6 hours before the alert went out and 181 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, Corpus Christi, TX at 12:00Z on 2004-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2117 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, Corpus Christi, TX at 12:00Z on 2004-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 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
2117 J/kg
Mixed-layer CIN
-85 J/kg
Mixed-layer LCL
641 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
135 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.6

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
Apr 30, 7:00 PM CDTMesoscale DiscussionSPCBosque, Brown, Coleman, Comanche, Concho, Eastland and 11 more90 min
Apr 30, 7:22 PM CDTMesoscale DiscussionSPCAnderson, Bowie, Camp, Cass, Cherokee, Delta and 25 more83 min
Apr 30, 7:40 PM CDTSevere Thunderstorm WatchSPCAnderson, Bowie, Camp, Delta, Ellis, Fannin and 20 more5 hr
Apr 30, 8:14 PM CDTMesoscale DiscussionSPCArcher, Clay, Collin, Cooke, Denton, Grayson and 8 more91 min
Apr 30, 9:07 PM CDTMesoscale DiscussionSPCBosque, Brown, Comanche, Coryell, Erath, Hamilton and 8 more53 min
Apr 30, 9:54 PM CDTMesoscale DiscussionSPCAnderson, Bowie, Camp, Delta, Ellis, Franklin and 19 more96 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, 12:50 AM CDTSevere Thunderstorm WatchSPCAnderson, Bell, Bosque, Bowie, Camp, Cass and 47 more6 hr
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, 2:38 AM CDTMesoscale DiscussionSPCAngelina, Sabine, San Augustine, Shelby37 min
May 1, 3:10 AM CDTSevere Thunderstorm WatchSPCAngelina, Sabine, San Augustine, Shelby6 hr
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, 5:13 AM CDTMesoscale DiscussionSPCAnderson, Cherokee, Harrison, Nacogdoches, Panola, Rusk and 1 more92 min
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, 7:47 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, 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.