Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 555

April 24, 200328 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2003, 7:14 AM CDT for 28 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 24, 2003, 7:14 AM CDT (12:14 UTC)
Expired
Apr 24, 2003, 9:15 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 28 counties

Austin County, TX, Bastrop County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Chambers County, TX, Colorado County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend County, TX, Gonzales County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Lavaca County, TX, Lee County, TX, Liberty County, TX, Montgomery County, TX, Polk County, TX, San Jacinto County, TX, Trinity County, TX, Victoria County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 119 km from the middle of the area, began a volume at 12:16 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

Corpus Christi, TX (KCRP), launched 12:00Z, 0.2 hours before the alert went out and 258 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 2003-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2198 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 2003-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 square meters per square second.1939587897117Sfc1 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
2198 J/kg
Mixed-layer CIN
-178 J/kg
Mixed-layer LCL
603 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
137 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.8

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 23, 7:00 PM CDTMesoscale DiscussionSPCCrockett, Edwards, Kimble, Kinney, Mason, Menard and 5 more90 min
Apr 23, 7:03 PM CDTMesoscale DiscussionSPCBosque, Collin, Comanche, Cooke, Coryell, Dallas and 25 more117 min
Apr 23, 7:45 PM CDTTornado WatchSPCBandera, Bexar, Blanco, Burnet, Caldwell, Comal and 11 more4 hr
Apr 23, 8:43 PM CDTMesoscale DiscussionSPCArcher, Baylor, Brown, Callahan, Clay, Coleman and 15 more77 min
Apr 23, 9:35 PM CDTSevere Thunderstorm WatchSPCCollin, Cooke, Dallas, Delta, Denton, Ellis and 20 more5 hr
Apr 23, 11:43 PM CDTMesoscale DiscussionSPCAnderson, Bowie, Camp, Cass, Cherokee, Delta and 23 more2 hr
Apr 24, 2:41 AM CDTMesoscale DiscussionSPCAnderson, Bell, Cass, Cherokee, Falls, Freestone and 12 more2 hr
Apr 24, 6:30 AM CDTSevere Thunderstorm WatchSPCAngelina, Hardin, Jasper, Newton, Sabine, San Augustine and 2 more5 hr
Apr 24, 6:40 AM CDTSevere Thunderstorm WatchSPCAngelina, Hardin, Jasper, Newton, Sabine, San Augustine and 2 more4 hr
Apr 24, 7:30 AM CDTTornado WatchSPCAngelina, Austin, Brazoria, Brazos, Burleson, Chambers and 17 more6 hr
Apr 24, 9:11 AM CDTMesoscale DiscussionSPCFort Bend, Harris, Liberty, Montgomery, Polk, San Jacinto2 hr
Apr 24, 11:40 AM CDTMesoscale DiscussionSPCSabine, San Augustine, Shelby65 min

Nearby

Mesoscale Discussions in Texas, 2003Every mesoscale discussion in 2003

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.