Alert archive / Texas / Mesoscale Discussions in 2003
Mesoscale Discussion 2140
The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2003, 11:31 AM CDT for 33 counties in Texas. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- Aug 11, 2003, 11:31 AM CDT (16:31 UTC)
- Expired
- Aug 11, 2003, 1:00 PM CDT
- In force
- 89 min
- Issued by
- the Storm Prediction Center
All 33 counties
Austin County, TX, Bastrop County, TX, Brazoria County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Chambers County, TX, Colorado County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend County, TX, Goliad County, TX, Gonzales County, TX, Grimes County, TX, Guadalupe County, TX, Harris County, TX, Hays County, TX, Jackson County, TX, Lavaca County, TX, Lee County, TX, Liberty County, TX, Montgomery County, TX, Polk County, TX, Refugio County, TX, San Jacinto County, TX, Travis County, TX, Victoria County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Williamson County, TX, Wilson 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
Corpus Christi, TX (KCRP), launched 12:00Z, 4.5 hours before the alert went out and 247 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
- 1123 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 798 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
746 ACUS11 KWNS 111631 SWOMCD SPC MCD 111631 TXZ000-111800- MESOSCALE DISCUSSION 2140 NWS STORM PREDICTION CENTER NORMAN OK 1131 AM CDT MON AUG 11 2003 AREAS AFFECTED...PORTIONS OF SERN TX CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 111631Z - 111800Z THUNDERSTORMS WILL CONTINUE TO MOVE SWD ACROSS SERN TX WITH ACTIVITY INCREASING IN INTENSITY/COVERAGE DURING THE NEXT FEW HOURS. WW MAY BE REQUIRED IN THE NEXT HOUR. REGIONAL RADARS SHOW STORMS OVER HOUSTON/TRINITY COUNTIES WITH ADDITIONAL STORMS DEVELOPING WWD ALONG A SURFACE BOUNDARY EXTENDING INTO ROBERTSON COUNTY TO CENTRAL/WRN TX. THE STRONGEST STORMS OVER HOUSTON/TRINITY COUNTIES ARE TRACKING SSEWD ALONG A N-S ORIENTED AND WWD MOVING OUTFLOW BOUNDARY FROM CONVECTION OVER ERN TX/SWRN LA. CLEAR SKIES SOUTH AND WEST OF SURFACE BOUNDARIES HAS ALLOWED THE AIR MASS TO BECOME MODERATELY UNSTABLE /MLCAPE UP TO 2000 J/KG/. DEEP LAYER SHEAR AROUND 25 KT WILL FAVOR MULTICELL STORMS WITH ACTIVITY LIKELY INCREASING IN INTENSITY/COVERAGE AS STORMS CONTINUE TO DEVELOP AND MOVE SWD INTO A MORE UNSTABLE AIR MASS. ..PETERS.. 08/11/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LCH...HGX...FWD...CRP...EWX... 30619802 31069490 29529438 28289714 29309826
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 12:05 PM CDT | Severe Thunderstorm Watch | SPC | Austin, Brazoria, Colorado, Fort Bend, Galveston, Harris and 8 more | 6 hr |
| Aug 11, 2:06 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Cooke, Dallas and 31 more | 54 min |
| Aug 11, 2:31 PM CDT | Mesoscale Discussion | SPC | Atascosa, Austin, Bandera, Bastrop, Bee, Bexar and 44 more | 29 min |
| Aug 11, 2:35 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Bastrop, Bee, Bexar, Blanco and 21 more | 5 hr |
| Aug 11, 4:45 PM CDT | Severe Thunderstorm Watch | SPC | Bosque, Clay, Collin, Comanche, Cooke, Dallas and 17 more | 5 hr |
| Aug 11, 5:16 PM CDT | Mesoscale Discussion | SPC | Anderson, Angelina, Austin, Brazoria, Brazos, Chambers and 21 more | 59 min |
| Aug 11, 5:29 PM CDT | Mesoscale Discussion | SPC | Collin, Dallas, Ellis, Grayson, Navarro, Rockwall | 2 hr |
| Aug 11, 6:09 PM CDT | Mesoscale Discussion | SPC | Aransas, Atascosa, Bandera, Bastrop, Bee, Bexar and 42 more | 96 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.