Alert archive / Texas / Mesoscale Discussions in 2003
Mesoscale Discussion 784
The Storm Prediction Center issued this mesoscale discussion at May 6, 2003, 8:44 AM CDT for 20 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 6, 2003, 8:44 AM CDT (13:44 UTC)
- Expired
- May 6, 2003, 10:45 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
Counties Bastrop County, TX, Bell County, TX, Blanco County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Comal County, TX, Coryell County, TX, Falls County, TX, Freestone County, TX, Guadalupe County, TX, Hays County, TX, Lee County, TX, Limestone County, TX, McLennan County, TX, Milam County, TX, Robertson County, TX, Travis County, TX, Williamson 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
Fort Worth, TX (KFWD), launched 12:00Z, 1.7 hours before the alert went out and 259 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
- 2816 J/kg
- Mixed-layer CIN
- -137 J/kg
- Mixed-layer LCL
- 1185 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 167 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 6.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 061345 SWOMCD SPC MCD 061344 TXZ000-061545- MESOSCALE DISCUSSION 0784 NWS STORM PREDICTION CENTER NORMAN OK 0844 AM CDT TUE MAY 06 2003 AREAS AFFECTED...CNTRL TX CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 061344Z - 061545Z ELEVATED CONVECTION CURRENTLY IN CNTRL TEXAS SHOULD CONTINUE TO INCREASE IN INTENSITY. LARGE HAIL WILL BE THE PRIMARY THREAT WITH THE ACTIVITY. WW MAY BECOME NECESSARY WITHIN THE NEXT 1-2 HOURS. VERY MOIST AIR MASS WAS IN PLACE ACROSS CNTRL TX WITH LOWER TO MID 70S. MLCAPE WERE 1500-2000 J/KG WITH 50 KT OF DEEP LAYER SHEAR. 12Z DEL RIO SOUNDING SHOWED MOST OF THE INSTABILITY WAS ABOVE 800 MB. AS A RESULT...THE CONVECTION WILL REMAIN ELEVATED. STEEP LAPSE RATES AROUND 8.4 C/KM...STRONG ELEVATED INSTABILITY AND STRONG DEEP LAYER SHEAR SHOULD RESULT IN A POTENTIAL FOR LARGE HAIL. ..BROYLES.. 05/06/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...HGX...FWD...EWX...SJT... 29469851 30199866 30889854 31569757 32029642 31589603 30569607 29939701 29509792
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 9:10 AM CDT | Severe Thunderstorm Watch | SPC | Bell, Bosque, Brown, Burnet, Callahan, Coleman and 28 more | 6 hr |
| May 6, 12:14 PM CDT | Mesoscale Discussion | SPC | Bandera, Bell, Bexar, Blanco, Burnet, Comal and 16 more | 2 hr |
| May 6, 2:21 PM CDT | Mesoscale Discussion | SPC | Austin, Bastrop, Brazos, Burleson, Colorado, Fayette and 11 more | 114 min |
| May 6, 2:47 PM CDT | Mesoscale Discussion | SPC | Collin, Dallas, Delta, Fannin, Franklin, Grayson and 10 more | 118 min |
| May 6, 4:46 PM CDT | Mesoscale Discussion | SPC | Collin, Dallas, Delta, Denton, Ellis, Fannin and 7 more | 119 min |
| May 6, 5:15 PM CDT | Severe Thunderstorm Watch | SPC | Collin, Cooke, Dallas, Delta, Denton, Eastland and 19 more | 5 hr |
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.