Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 319

April 10, 20046 counties in Arkansas; 13 parishes in Louisiana; 16 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2004, 2:50 PM CDT for 6 counties in Arkansas; 13 parishes in Louisiana; 16 counties in Texas. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
Apr 10, 2004, 2:50 PM CDT (19:50 UTC)
Expired
Apr 10, 2004, 4:45 PM CDT
In force
115 min
Issued by
the Storm Prediction Center
All 35 counties

Ashley County, AR, Chicot County, AR, Columbia County, AR, Lafayette County, AR, Miller County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Anderson County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 7.8 hours before the alert went out and 38 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, Shreveport, LA at 12:00Z on 2004-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 168 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, Shreveport, LA at 12:00Z on 2004-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 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
168 J/kg
Mixed-layer CIN
-692 J/kg
Mixed-layer LCL
1347 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
117 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.9

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 9, 7:02 PM CDTMesoscale DiscussionSPCCrawford, Franklin, Garland, Hempstead, Howard, Johnson and 9 more58 min
Apr 9, 7:40 PM CDTSevere Thunderstorm WatchSPCClark, Dallas, Garland, Grant, Hempstead, Hot Spring and 10 more5 hr
Apr 9, 10:06 PM CDTMesoscale DiscussionSPCClark, Dallas, Grant, Hempstead, Hot Spring, Howard and 5 more54 min
Apr 9, 11:57 PM CDTMesoscale DiscussionSPCHempstead, Little River, Nevada, Sevier63 min
Apr 10, 5:57 AM CDTMesoscale DiscussionSPCHoward, Little River, Pike, Polk, Scott, Sebastian and 1 more93 min
Apr 10, 3:25 PM CDTSevere Thunderstorm WatchSPCAshley, Bradley, Calhoun, Chicot, Columbia, Desha and 5 more6 hr
Apr 10, 5:38 PM CDTMesoscale DiscussionSPCAllen, Beauregard, Calcasieu, Cameron, Vernon2 hr
Apr 10, 6:30 PM CDTSevere Thunderstorm WatchSPCBeauregard, Calcasieu, Cameron, Vernon5 hr
Apr 9, 9:25 PM CDTMesoscale DiscussionSPCArmstrong, Bailey, Briscoe, Castro, Childress, Collingsworth and 16 more95 min
Apr 10, 9:08 AM CDTMesoscale DiscussionSPCBandera, Bell, Blanco, Bosque, Brown, Burnet and 21 more2 hr
Apr 10, 10:20 AM CDTSevere Thunderstorm WatchSPCBandera, Bastrop, Bell, Bexar, Blanco, Bosque and 33 more6 hr
Apr 10, 12:43 PM CDTMesoscale DiscussionSPCBandera, Bastrop, Bell, Bexar, Blanco, Burleson and 26 more2 hr
Apr 10, 2:50 PM CDTSevere Thunderstorm WatchSPCAtascosa, Austin, Bandera, Bastrop, Bee, Bexar and 52 more5 hr
Apr 10, 6:09 PM CDTMesoscale DiscussionSPCAtascosa, Austin, Bee, Brazoria, Colorado, DeWitt and 17 more96 min

Nearby

Mesoscale Discussions in Texas, 2004Mesoscale Discussions in Louisiana, 2004Mesoscale Discussions in Arkansas, 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.