Alert archive / Texas / Mesoscale Discussions in 2008
Mesoscale Discussion 921
The Storm Prediction Center issued this mesoscale discussion at May 14, 2008, 7:31 AM CDT for 13 parishes in Louisiana; 40 counties in Texas. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- May 14, 2008, 7:31 AM CDT (12:31 UTC)
- Expired
- May 14, 2008, 9:30 AM CDT
- In force
- 119 min
- Issued by
- the Storm Prediction Center
All 53 counties
Beauregard Parish, LA, Bienville Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Winn Parish, LA, Anderson County, TX, Angelina County, TX, Austin County, TX, Bastrop County, TX, Bell County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Cherokee County, TX, Falls County, TX, Fayette County, TX, Freestone County, TX, Grimes County, TX, Hardin County, TX, Houston County, TX, Jasper County, TX, Lee County, TX, Leon County, TX, Liberty County, TX, Limestone County, TX, Madison County, TX, Milam County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Panola County, TX, Polk County, TX, Robertson County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Travis County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Williamson County, TX
The radar
The Ft Hood radar (KGRK), 184 km from the middle of the area, began a volume at 12:31 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, 0.5 hours before the alert went out and 249 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
- 1363 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 514 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- -53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 141232 SWOMCD SPC MCD 141231 LAZ000-TXZ000-141430- MESOSCALE DISCUSSION 0921 NWS STORM PREDICTION CENTER NORMAN OK 0731 AM CDT WED MAY 14 2008 AREAS AFFECTED...EAST/NORTHEAST TX INTO NORTHERN LA CONCERNING...SEVERE THUNDERSTORM WATCH 318... VALID 141231Z - 141430Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 318 CONTINUES. SEVERE THUNDERSTORM WATCH 318 CONTINUES UNTIL 15Z...HOWEVER AN ADDITIONAL /OR REPLACEMENT/ WATCH COULD BE NEEDED WITHIN THE NEXT HOUR OR SO ACROSS EAST/NORTHEAST TX INTO LA. MCV-AIDED/RAIN-EMBEDDED BOW HEAD CIRCULATION CONTINUES TO STEADILY ADVANCE EAST-NORTHEAST ACROSS EAST CENTRAL TX BETWEEN I-35/I-45 EARLY THIS MORNING...ACROSS FALLS COUNTY TX AS OF 1215Z. A RAIN-REINFORCED BOUNDARY LIES NORTHEASTWARD AHEAD OF THIS PERSISTENT CIRCULATION INTO NORTHEAST TX/NORTH CENTRAL LA...WITH LOWER 70S F TEMPERATURES AND DEWPOINTS ALONG/SOUTH OF THIS SURFACE BOUNDARY. ALTHOUGH MCS-LEADING PRECIPITATION IS COMMON ACROSS NORTHEAST/EAST CENTRAL TX AT THIS TIME...POCKETS OF LOCAL HEATING AND THE MOIST NATURE OF THE AIRMASS SUGGEST A SOMEWHAT CONCENTRATED SEVERE THREAT WILL REMAIN ALONG/SOUTH OF THIS BOUNDARY ACROSS EAST CENTRAL/NORTHEAST TX INTO LA THROUGH EARLY AFTERNOON. THE PRIMARY RISKS WOULD BE THE POSSIBILITY OF DAMAGING WINDS AND PERHAPS A FEW TORNADOES. AN ADDITIONAL WATCH MAY BE NEEDED SOON. OTHERWISE...HEAVY RAINFALL WILL REMAIN A CONCERN WITHIN THIS CORRIDOR...AND AN ISOLATED/MAINLY HAIL THREAT WILL CONTINUE ACROSS THE REMAINING MCS-TRAILING PORTION OF WW 318. ..GUYER.. 05/14/2008 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...JAN...LCH...SHV...HGX...FWD...EWX... 30649867 31669675 32219511 32649258 31499191 30509356 29539698
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 13, 7:11 PM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Assumption, Avoyelles, Bienville, Bossier and 45 more | 2 hr |
| May 14, 2:28 AM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Claiborne, De Soto, Natchitoches and 3 more | 92 min |
| May 14, 7:50 AM CDT | Tornado Watch | SPC | Beauregard, Caldwell, De Soto, Grant, LaSalle, Natchitoches and 5 more | 7 hr |
| May 14, 10:23 AM CDT | Mesoscale Discussion | SPC | Beauregard, Bienville, De Soto, Grant, Jackson, LaSalle and 7 more | 97 min |
| May 14, 1:55 PM CDT | Mesoscale Discussion | SPC | Ascension, Avoyelles, Catahoula, Concordia, East Baton Rouge, East Feliciana and 10 more | 65 min |
| May 14, 2:04 PM CDT | Tornado Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 31 more | 7 hr |
| May 14, 5:12 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 34 more | 63 min |
| May 13, 8:05 PM CDT | Mesoscale Discussion | SPC | Brown, Clay, Coleman, Comanche, Cooke, Denton and 10 more | 85 min |
| May 13, 8:29 PM CDT | Mesoscale Discussion | SPC | Bandera, Blanco, Burnet, Comal, Concho, Edwards and 15 more | 91 min |
| May 13, 8:53 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bell, Bosque, Brown, Callahan, Coke and 56 more | 7 hr |
| May 13, 9:54 PM CDT | Severe Thunderstorm Watch | SPC | Bastrop, Brazos, Burleson, Caldwell, Comal, Fayette and 5 more | 6 hr |
| May 13, 11:41 PM CDT | Mesoscale Discussion | SPC | Bastrop, Bell, Blanco, Bosque, Brazos, Burleson and 18 more | 94 min |
| May 14, 12:50 AM CDT | Mesoscale Discussion | SPC | Archer, Armstrong, Baylor, Briscoe, Childress, Clay and 26 more | 85 min |
| May 14, 1:19 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bexar, Blanco, Comal, Dimmit and 19 more | 56 min |
| May 14, 1:40 AM CDT | Tornado Watch | SPC | Atascosa, Bandera, Bexar, Comal, Dimmit, Edwards and 12 more | 6 hr |
| May 14, 2:59 AM CDT | Mesoscale Discussion | SPC | Austin, Bastrop, Bell, Blanco, Brazos, Burleson and 26 more | 91 min |
| May 14, 3:39 AM CDT | Severe Thunderstorm Watch | SPC | Austin, Bastrop, Bell, Blanco, Brazos, Burleson and 25 more | 6 hr |
| May 14, 5:13 AM CDT | Mesoscale Discussion | SPC | Austin, Bastrop, Bell, Blanco, Brazos, Burleson and 29 more | 92 min |
| May 14, 5:38 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bexar, Edwards, Frio, Kerr and 7 more | 97 min |
| May 14, 6:42 AM CDT | Mesoscale Discussion | SPC | Austin, Bastrop, Bell, Blanco, Brazos, Burleson and 30 more | 63 min |
| May 14, 12:12 PM CDT | Mesoscale Discussion | SPC | Andrews, Dawson, Gaines, Terry, Yoakum | 93 min |
| May 14, 12:47 PM CDT | Tornado Watch | SPC | Andrews, Borden, Cochran, Coke, Crane, Dawson and 22 more | 6 hr |
| May 14, 3:33 PM CDT | Mesoscale Discussion | SPC | Crockett, Edwards, Kerr, Kimble, Kinney, Menard and 5 more | 27 min |
| May 14, 3:50 PM CDT | Tornado Watch | SPC | Bandera, Blanco, Brown, Burnet, Callahan, Coleman and 37 more | 7 hr |
| May 14, 3:58 PM CDT | Mesoscale Discussion | SPC | Anderson, Bastrop, Bell, Brazos, Burleson, Falls and 9 more | 92 min |
| May 14, 6:08 PM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Cochran, Coke, Crane, Crosby and 27 more | 67 min |
| May 14, 6:40 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Clay, Foard, Hardeman, Knox and 2 more | 95 min |
Nearby
Mesoscale Discussions in Texas, 2008Mesoscale Discussions in Louisiana, 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.