Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 407

April 6, 200347 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2003, 9:12 AM CDT for 47 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 6, 2003, 9:12 AM CDT (14:12 UTC)
Expired
Apr 6, 2003, 11:15 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 47 counties

Anderson County, TX, Bosque County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Grayson County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Limestone County, TX, Marion County, TX, McLennan County, TX, Montague County, TX, Morris County, TX, Navarro County, TX, Panola County, TX, Parker County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Rusk County, TX, Smith County, TX, Somervell County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wise County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 91 km from the middle of the area, began a volume at 14:15 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 12:00Z, 2.2 hours before the alert went out and 78 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 12:00Z on 2003-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1494 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 12:00Z on 2003-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 210 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
1494 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
662 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
210 m²/s²
0-3 km storm-relative helicity
292 m²/s²
Significant tornado parameter
2.0
Supercell composite
8.7

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 5, 6:11 PM CSTMesoscale DiscussionSPCBaylor, Briscoe, Cottle, Crosby, Dickens, Floyd and 9 more64 min
Apr 5, 6:35 PM CSTMesoscale DiscussionSPCArcher, Clay, Collin, Cooke, Dallas, Delta and 23 more115 min
Apr 5, 6:40 PM CSTTornado WatchSPCBriscoe, Childress, Cottle, Crosby, Dickens, Fisher and 16 more5 hr
Apr 5, 8:04 PM CSTMesoscale DiscussionSPCArcher, Baylor, Clay, Collin, Cooke, Dallas and 25 more116 min
Apr 5, 9:20 PM CSTMesoscale DiscussionSPCArcher, Camp, Clay, Collin, Cooke, Dallas and 31 more55 min
Apr 5, 9:35 PM CSTTornado WatchSPCArcher, Bowie, Camp, Cass, Clay, Collin and 38 more5 hr
Apr 5, 10:26 PM CSTMesoscale DiscussionSPCBaylor, Childress, Cottle, Dickens, Fisher, Foard and 11 more64 min
Apr 5, 11:43 PM CSTMesoscale DiscussionSPCArcher, Camp, Clay, Collin, Cooke, Dallas and 31 more92 min
Apr 6, 3:13 AM CDTMesoscale DiscussionSPCArcher, Baylor, Camp, Cass, Cherokee, Clay and 39 more107 min
Apr 6, 3:39 AM CDTMesoscale DiscussionSPCArcher, Baylor, Camp, Cass, Cherokee, Clay and 39 more66 min
Apr 6, 4:50 AM CDTMesoscale DiscussionSPCArcher, Baylor, Brown, Callahan, Coke, Coleman and 27 more115 min
Apr 6, 5:35 AM CDTSevere Thunderstorm WatchSPCWichita4 hr
Apr 6, 10:20 AM CDTMesoscale DiscussionSPCBowie, Cass, Harrison, Marion, Morris, Panola55 min
Apr 6, 10:30 AM CDTTornado WatchSPCBowie, Camp, Cass, Cherokee, Franklin, Gregg and 14 more6 hr
Apr 6, 12:03 PM CDTMesoscale DiscussionSPCGregg, Harrison, Marion, Panola, Rusk117 min
Apr 6, 12:40 PM CDTTornado WatchSPCAnderson, Brazos, Burleson, Cherokee, Collin, Cooke and 33 more5 hr
Apr 6, 2:55 PM CDTSevere Thunderstorm WatchSPCBowie, Delta, Lamar, Red River5 hr
Apr 6, 3:00 PM CDTMesoscale DiscussionSPCAnderson, Brazos, Cherokee, Delta, Freestone, Grimes and 21 more90 min
Apr 6, 3:26 PM CDTMesoscale DiscussionSPCAngelina, Nacogdoches, Sabine, San Augustine, Shelby2 hr
Apr 6, 3:45 PM CDTTornado WatchSPCAngelina, Gregg, Hardin, Harrison, Jasper, Liberty and 9 more5 hr
Apr 6, 5:35 PM CDTMesoscale DiscussionSPCAngelina, Gregg, Hardin, Harrison, Jasper, Liberty and 10 more115 min
Apr 6, 6:23 PM CDTMesoscale DiscussionSPCNewton, Sabine97 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.