Alert archive / Texas / Mesoscale Discussions in 2003
Mesoscale Discussion 2147
The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2003, 5:29 PM CDT for 6 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 11, 2003, 5:29 PM CDT (22:29 UTC)
- Expired
- Aug 11, 2003, 7:30 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
Counties Collin County, TX, Dallas County, TX, Ellis County, TX, Grayson County, TX, Navarro County, TX, Rockwall County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 73 km from the middle of the area, began a volume at 22:29 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 nearest sounding before it
Fort Worth, TX (KFWD), launched 12:00Z, 10.5 hours before the alert went out and 54 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
- 638 J/kg
- Mixed-layer CIN
- -148 J/kg
- Mixed-layer LCL
- 1416 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 60 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
427 ACUS11 KWNS 112229 SWOMCD SPC MCD 112229 TXZ000-OKZ000-120030- MESOSCALE DISCUSSION 2147 NWS STORM PREDICTION CENTER NORMAN OK 0529 PM CDT MON AUG 11 2003 AREAS AFFECTED...N-CNTRL TX CONCERNING...SEVERE THUNDERSTORM WATCH 858... VALID 112229Z - 120030Z ADDITIONAL THUNDERSTORM DEVELOPMENT ACROSS THE EASTERN PORTION OF THE WATCH IS POSSIBLE THE NEXT COUPLE OF HOURS INCLUDING THE AREA AROUND DALLAS. STRONG ORGANIZED OUTFLOW BOUNDARY FROM STORMS IN NORTHEASTERN TEXAS IS CONTINUING TO ADVANCE FROM EAST TO WEST AND IS MOVING INTO THE EASTERN COUNTIES OF THE WATCH. STORMS MAY FORM ALONG THE BOUNDARY AND GIVEN THE 30 DEGREE TEMPERATURE DEW POINT SPREAD AT THE SURFACE, BRIEF DAMAGING WINDS MAY BE POSSIBLE WITH THESE STORMS. ONCE THESE STORMS FORM ALONG THE BOUNDARY, THEY SHOULD MOVE SOUTHWARD ALONG THE BOUNDARY WITH THE POSSIBILITY OF ADDITIONAL STORM/BOUNDARY INTERACTIONS. ..BOTHWELL.. 08/11/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FWD...OUN... 31909638 32069672 32509700 33329705 33669704 33789704 33869692 33869678 33649637
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 11:31 AM CDT | Mesoscale Discussion | SPC | Austin, Bastrop, Brazoria, Brazos, Burleson, Caldwell and 27 more | 89 min |
| 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, 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; radar from the NEXRAD Level II archive.