Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 548

April 4, 200810 counties in Arkansas; 14 parishes in Louisiana; 95 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2008, 12:48 AM CDT for 10 counties in Arkansas; 14 parishes in Louisiana; 95 counties in Texas. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Apr 4, 2008, 12:48 AM CDT (05:48 UTC)
Expired
Apr 4, 2008, 2:45 AM CDT
In force
117 min
Issued by
the Storm Prediction Center
All 119 counties

Bradley County, AR, Calhoun County, AR, Columbia County, AR, Hempstead County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Anderson County, TX, Angelina County, TX, Bell County, TX, Blanco County, TX, Bosque County, TX, Bowie County, TX, Brazos County, TX, Brown County, TX, Burleson County, TX, Burnet County, TX, Callahan County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Concho County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Eastland County, TX, Edwards County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Gillespie County, TX, Grayson County, TX, Gregg County, TX, Hamilton County, TX, Harrison County, TX, Hays County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Lamar County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, Llano County, TX, Madison County, TX, Marion County, TX, Mason County, TX, McCulloch County, TX, McLennan County, TX, Menard County, TX, Milam County, TX, Mills County, TX, Morris County, TX, Nacogdoches County, TX, Navarro County, TX, Palo Pinto County, TX, Panola County, TX, Parker County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rockwall County, TX, Runnels County, TX, Rusk County, TX, San Augustine County, TX, San Saba County, TX, Schleicher County, TX, Shackelford County, TX, Shelby County, TX, Smith County, TX, Somervell County, TX, Stephens County, TX, Sutton County, TX, Tarrant County, TX, Taylor County, TX, Titus County, TX, Tom Green County, TX, Travis County, TX, Trinity County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Williamson County, TX, Wise County, TX, Wood County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 55 km from the middle of the area, began a volume at 05:50 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, 5.8 hours before the alert went out and 77 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 2008-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1834 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 2008-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 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
1834 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
989 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
170 m²/s²
Significant tornado parameter
1.9
Supercell composite
7.2

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 3, 7:59 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Calhoun, Carroll, Clark and 46 more91 min
Apr 3, 8:21 PM CDTSevere Thunderstorm WatchSPCArkansas, Baxter, Benton, Boone, Calhoun, Carroll and 52 more8 hr
Apr 3, 9:49 PM CDTMesoscale DiscussionSPCArkansas, Baxter, Boone, Clark, Clay, Cleburne and 55 more86 min
Apr 3, 10:23 PM CDTSevere Thunderstorm WatchSPCClay, Craighead, Crittenden, Cross, Greene, Lawrence and 6 more4 hr
Apr 3, 11:19 PM CDTMesoscale DiscussionSPCArkansas, Calhoun, Clark, Clay, Cleburne, Cleveland and 45 more86 min
Apr 4, 1:28 AM CDTMesoscale DiscussionSPCCrittenden, Lee2 hr
Apr 4, 2:46 AM CDTSevere Thunderstorm WatchSPCLee, Phillips8 hr
Apr 4, 3:34 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 15 more56 min
Apr 4, 3:55 AM CDTSevere Thunderstorm WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 19 more7 hr
Apr 4, 7:55 AM CDTMesoscale DiscussionSPCAshley, Chicot2 hr
Apr 4, 5:34 AM CDTSevere Thunderstorm WatchSPCNatchitoches, Sabine6 hr
Apr 4, 9:48 AM CDTTornado WatchSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 23 more9 hr
Apr 4, 4:06 PM CDTMesoscale DiscussionSPCAcadia, Allen, Beauregard, Calcasieu, Evangeline, Jefferson Davis and 1 more84 min
Apr 4, 5:02 PM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 16 more88 min
Apr 4, 5:48 PM CDTTornado WatchSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 14 more6 hr
Apr 3, 8:33 PM CDTSevere Thunderstorm WatchSPCArcher, Baylor, Clay, Collin, Cooke, Delta and 13 more9 hr
Apr 4, 1:22 AM CDTSevere Thunderstorm WatchSPCBandera, Bell, Blanco, Bosque, Brown, Burnet and 47 more9 hr
Apr 4, 4:14 AM CDTMesoscale DiscussionSPCAnderson, Bandera, Bastrop, Bell, Bexar, Blanco and 48 more91 min

Nearby

Mesoscale Discussions in Texas, 2008Mesoscale Discussions in Louisiana, 2008Mesoscale Discussions in Arkansas, 2008Every mesoscale discussion in 2008

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.