Alert archive / Texas / Mesoscale Discussions in 2003
Mesoscale Discussion 796
The Storm Prediction Center issued this mesoscale discussion at May 6, 2003, 2:47 PM CDT for 11 counties in Oklahoma; 16 counties in Texas. It was in force for 118 min.
The area
The outline as issued.
The facts
- Issued
- May 6, 2003, 2:47 PM CDT (19:47 UTC)
- Expired
- May 6, 2003, 4:45 PM CDT
- In force
- 118 min
- Issued by
- the Storm Prediction Center
All 27 counties
Atoka County, OK, Bryan County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, McIntosh County, OK, Pittsburg County, OK, Pushmataha County, OK, Collin County, TX, Dallas County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Titus County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 185 km from the middle of the area, began a volume at 19:50 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, 7.8 hours before the alert went out and 164 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.
662 ACUS11 KWNS 061948 SWOMCD SPC MCD 061947 TXZ000-OKZ000-062145- MESOSCALE DISCUSSION 0796 NWS STORM PREDICTION CENTER NORMAN OK 0247 PM CDT TUE MAY 06 2003 AREAS AFFECTED...ERN OK/N TX CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 061947Z - 062145Z ...CONVECTIVE INITIATION IS EXPECTED WITHIN 1-3 HOURS WITH TORNADO WATCH SOON TO BE ISSUED ACROSS SERN OK/FAR NRN TX... LATEST SFC MESOANALYSIS SHOWS SFC DRYLINE FROM JUST WEST OF TULSA TO WEST OF ARDMORE TO E OF ABILENE...MARKED BY CUMULUS FIELD ON VISIBLE SATELLITE. VISUAL OBSERVATIONS AND SATELLITE SHOW DEVELOPING TCU FROM ABOUT 30 NW MLC...WHICH IS FORMING ON A GRAVITY WAVE MOVING NWD FROM EARLIER CONVECTIVE COMPLEX IN TX. WHETHER THIS ACTIVITY BECOMES SFC BASED IS UNCERTAIN. HOWEVER...MAIN BOUNDARY/FORCING WILL BE DRYLINE. 18Z SPECIAL SOUNDING FROM FTW SHOWED SBCAPE VALUES IN EXCESS OF 6300 J/KG. THE CAP APPEARS TO BE ERODING QUICKLY. ONCE TSTMS FORM...THEY WILL QUICKLY BECOME SEVERE WITH LARGE HAIL AND DAMAGING WINDS POSSIBLE. THERE WILL BE A THREAT FOR TORNADIC SUPERCELLS GIVEN EXTREME INSTABILITY AND STRONG SHEAR. ..TAYLOR.. 05/06/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...SHV...TSA...FWD...OUN... 32749703 34319660 35459580 35289460 33439474 32349558
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 10:32 AM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Cherokee, Coal, Craig, Creek and 19 more | 118 min |
| May 6, 11:40 AM CDT | Tornado Watch | SPC | Adair, Cherokee, Craig, Delaware, Mayes, Muskogee and 9 more | 7 hr |
| May 6, 3:05 PM CDT | Tornado Watch | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Haskell and 12 more | 6 hr |
| May 6, 3:42 PM CDT | Mesoscale Discussion | SPC | Craig, Delaware, Mayes, Nowata, Ottawa, Rogers and 1 more | 2 hr |
| May 6, 5:33 PM CDT | Mesoscale Discussion | SPC | Adair, Haskell, Sequoyah | 117 min |
| May 6, 6:55 PM CDT | Tornado Watch | SPC | Adair, Atoka, Bryan, Choctaw, Haskell, Latimer and 4 more | 5 hr |
| May 6, 8:44 AM CDT | Mesoscale Discussion | SPC | Bastrop, Bell, Blanco, Brazos, Burleson, Burnet and 14 more | 2 hr |
| 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, 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, 2003Mesoscale Discussions in Oklahoma, 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.