Alert archive / Texas / Mesoscale Discussions in 2004
Mesoscale Discussion 2437
The Storm Prediction Center issued this mesoscale discussion at Nov 23, 2004, 12:48 PM CST for Lafayette County, Miller County, Arkansas; 7 parishes in Louisiana; 64 counties in Texas. It was in force for 117 min.
The area
The outline as issued.
The facts
- Issued
- Nov 23, 2004, 12:48 PM CST (18:48 UTC)
- Expired
- Nov 23, 2004, 2:45 PM CST
- In force
- 117 min
- Issued by
- the Storm Prediction Center
All 73 counties
Lafayette County, AR, Miller County, AR, Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA, Grant Parish, LA, Natchitoches Parish, LA, Sabine Parish, LA, Winn Parish, LA, Anderson County, TX, Bastrop County, TX, Bell County, TX, Blanco County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Calhoun County, TX, Camp County, TX, Cass County, TX, Chambers County, TX, Cherokee County, TX, Comal County, TX, Ellis County, TX, Falls County, TX, Fayette County, TX, Fort Bend County, TX, Franklin County, TX, Freestone County, TX, Galveston County, TX, Gregg County, TX, Grimes County, TX, Guadalupe County, TX, Hardin County, TX, Harris County, TX, Harrison County, TX, Hays County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Jackson County, TX, Kaufman County, TX, Kendall County, TX, Lee County, TX, Leon County, TX, Liberty County, TX, Limestone County, TX, Madison County, TX, Marion County, TX, Matagorda County, TX, McLennan County, TX, Milam County, TX, Morris County, TX, Navarro County, TX, Panola County, TX, Rains County, TX, Refugio County, TX, Robertson County, TX, Rockwall County, TX, Rusk County, TX, Sabine County, TX, Smith County, TX, Titus County, TX, Travis County, TX, Upshur County, TX, Van Zandt County, TX, Victoria County, TX, Washington County, TX, Wharton County, TX, Williamson County, TX, Wood County, TX
The radar
The Houston radar (KHGX), 136 km from the middle of the area, began a volume at 18:52 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
Lake Charles Mun, LA (KLCH), launched 12:00Z, 6.8 hours before the alert went out and 234 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.
- Mixed-layer CAPE
- 534 J/kg
- Mixed-layer CIN
- -154 J/kg
- Mixed-layer LCL
- 1172 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 168 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.3
The text
As transmitted, in the capitals the NWS used until 2016.
701 ACUS11 KWNS 231848 SWOMCD SPC MCD 231848 ARZ000-LAZ000-TXZ000-232045- MESOSCALE DISCUSSION 2437 NWS STORM PREDICTION CENTER NORMAN OK 1248 PM CST TUE NOV 23 2004 AREAS AFFECTED...PORTIONS CENTRAL THROUGH NERN TX...NRN/WRN LA...SERN TX CONCERNING...TORNADO WATCH 883...884... VALID 231848Z - 232045Z PERSISTENT/TORNADIC TSTM WITH HYBRID OF HP SUPERCELL AND BOW CHARACTERISTICS WILL MOVE NEWD FROM ROBERTSON COUNTY ACROSS PORTIONS LEON/MADISON/HOUSTON COUNTIES OVER NEXT 1-2 HOURS...MAINTAINING POTENTIAL FOR TORNADOES...LARGE HAIL AND DESTRUCTIVE WINDS AS IT INTERACTS WITH SFC WARM FRONT. THIS STORM ALSO IS LOCATED NEAR SFC MESOLOW...WHICH WILL MAINTAIN OPTIMALLY FAVORABLE STORM-RELATIVE INFLOW IN BOUNDARY LAYER. TORNADO THREAT IS INCREASING OVER CENTRAL/NRN PORTIONS OF WWS AS WELL. WARM FRONT -- NOW ANALYZED FROM FREESTONE COUNTY GENERALLY EWD ACROSS NACOGDOCHES AREA INTO CENTRAL LA -- SHOULD CONTINUE TO LIFT NWD ACROSS NE TX AND ALLOW SFC-BASED BUOYANCY TO SPREAD INTO ARKLATEX REGION. AS A RESULT...WWS MAY NEED REPLACEMENT WITHIN NEXT COUPLE HOURS TO INCLUDE MORE OF NRN LA AND PERHAPS SRN AR. LARGE MASS OF CONVECTION NOW DEVELOPING OVER SE TX MAY RESTRICT FURTHER SFC DESTABILIZATION...HOWEVER MLCAPES 2000-2500 J/KG ARE COMMON ALREADY ACROSS THIS REGION BASED ON 18Z SHV/LCH/CRP RAOBS AND RUC/ETA-KF MODEL SOUNDINGS. EXPECT KINEMATIC WEAKNESSES IN 2-6 KM AGL PORTION OF HODOGRAPH TO GO AWAY AS LOW-MIDLEVEL FLOW STRENGTHENS IN RESPONSE TO APCHG UPPER TROUGH...AND ASSOCIATED SFC CYCLOGENESIS OVER CENTRAL/NERN TX. ..EDWARDS.. 11/23/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...SHV...HGX...FWD...EWX...JAN...LCH...CRP... 29519646 29529912 33349610 33309335 28109478 28159766 32049458 32079161
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 23, 8:45 AM CST | Tornado Watch | SPC | Lafayette, Miller | 6 hr |
| Nov 23, 10:37 AM CST | Mesoscale Discussion | SPC | Lafayette, Miller | 113 min |
| Nov 23, 1:40 PM CST | Mesoscale Discussion | SPC | Arkansas, Conway, Cross, Faulkner, Garland, Grant and 14 more | 95 min |
| Nov 23, 2:00 PM CST | Tornado Watch | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 25 more | 7 hr |
| Nov 23, 3:21 PM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 25 more | 114 min |
| Nov 22, 6:03 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 26 more | 2 hr |
| Nov 23, 9:45 AM CST | Tornado Watch | SPC | Allen, Beauregard, Calcasieu, De Soto, Grant, LaSalle and 5 more | 5 hr |
| Nov 23, 11:10 AM CST | Mesoscale Discussion | SPC | Avoyelles, Concordia, Madison, Tensas | 3 hr |
| Nov 23, 11:38 AM CST | Mesoscale Discussion | SPC | Allen, Beauregard, Calcasieu, Grant, LaSalle, Natchitoches and 4 more | 2 hr |
| Nov 23, 5:30 PM CST | Mesoscale Discussion | SPC | Beauregard, Caldwell, Catahoula, Franklin, Grant, Jackson and 7 more | 2 hr |
| Nov 22, 10:30 PM CST | Mesoscale Discussion | SPC | Borden, Coke, Crockett, Dawson, Fisher, Garza and 21 more | 2 hr |
| Nov 22, 11:00 PM CST | Tornado Watch | SPC | Andrews, Borden, Coke, Crane, Crockett, Dawson and 22 more | 6 hr |
| Nov 23, 2:58 AM CST | Mesoscale Discussion | SPC | Borden, Coke, Crockett, Fisher, Glasscock, Howard and 11 more | 92 min |
| Nov 23, 4:10 AM CST | Severe Thunderstorm Watch | SPC | Brown, Callahan, Coke, Coleman, Comanche, Concho and 19 more | 5 hr |
| Nov 23, 7:06 AM CST | Mesoscale Discussion | SPC | Anderson, Angelina, Austin, Bastrop, Bell, Blanco and 46 more | 84 min |
| Nov 23, 7:19 AM CST | Mesoscale Discussion | SPC | Brown, Callahan, Coleman, Comanche, Concho, Denton and 13 more | 86 min |
| Nov 23, 7:40 AM CST | Mesoscale Discussion | SPC | Dallam | 6 hr |
| Nov 23, 9:15 AM CST | Mesoscale Discussion | SPC | Collin, Dallas, Delta, Denton, Fannin, Grayson and 5 more | 3 hr |
| Nov 23, 12:15 PM CST | Mesoscale Discussion | SPC | Carson, Dallam, Hansford, Hartley, Hutchinson, Moore and 3 more | 5 hr |
| Nov 23, 12:16 PM CST | Mesoscale Discussion | SPC | Bosque, Brown, Coke, Coleman, Concho, Coryell and 22 more | 2 hr |
| Nov 23, 2:14 PM CST | Mesoscale Discussion | SPC | Briscoe, Childress, Cottle, Crosby, Dickens, Fisher and 20 more | 3 hr |
| Nov 23, 3:15 PM CST | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Bexar, Blanco, Bosque, Brown and 40 more | 5 hr |
| Nov 23, 5:30 PM CST | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 64 more | 6 hr |
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; radar from the NEXRAD Level II archive.