Alert archive / Texas / Mesoscale Discussions in 2003
Mesoscale Discussion 660
The Storm Prediction Center issued this mesoscale discussion at May 1, 2003, 10:55 AM CDT for 4 parishes in Louisiana; 5 counties in Oklahoma; 69 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 1, 2003, 10:55 AM CDT (15:55 UTC)
- Expired
- May 1, 2003, 1:00 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 78 counties
De Soto Parish, LA, Jackson Parish, LA, Red River Parish, LA, Sabine Parish, LA, Bryan County, OK, Coal County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Anderson County, TX, Angelina County, TX, Bell County, TX, Bosque County, TX, Brazos County, TX, Brown County, TX, Burleson County, TX, Burnet County, TX, Cherokee County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Coryell County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Fannin County, TX, Freestone County, TX, Grayson County, TX, Gregg County, TX, Grimes County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Houston County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Lampasas County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Llano County, TX, Madison County, TX, McLennan County, TX, Milam County, TX, Mills County, TX, Montague County, TX, Nacogdoches County, TX, Navarro County, TX, Palo Pinto County, TX, Panola County, TX, Parker County, TX, Rains County, TX, Robertson County, TX, Rockwall County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Saba County, TX, Shelby County, TX, Smith County, TX, Somervell County, TX, Tarrant County, TX, Travis County, TX, Trinity County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Washington County, TX, Williamson County, TX, Wise County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 70 km from the middle of the area, began a volume at 15:56 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, 3.9 hours before the alert went out and 96 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
- 2698 J/kg
- Mixed-layer CIN
- -157 J/kg
- Mixed-layer LCL
- 614 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 248 m²/s²
- 0-3 km storm-relative helicity
- 240 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 4.6
The text
As transmitted, in the capitals the NWS used until 2016.
768 ACUS11 KWNS 011555 SWOMCD SPC MCD 011555 LAZ000-TXZ000-OKZ000-011800- MESOSCALE DISCUSSION 0660 NWS STORM PREDICTION CENTER NORMAN OK 1055 AM CDT THU MAY 01 2003 AREAS AFFECTED...CNTRL AND ERN TX CONCERNING...OUTLOOK UPGRADE VALID 011555Z - 011800Z A SLIGHT RISK WILL BE EXTENDED SW AND WILL COVER ALL OF CNTRL AND NERN TX FOR THE DAY 1 PERIOD. STRONG INSTABILITY HAS DEVELOPED ACROSS THIS AREA. AS THE CAP WEAKENS ACROSS CNTRL AND NERN TX THIS AFTERNOON...THE RAPID DEVELOPMENT OF ISOLATED THUNDERSTORMS WILL BE LIKELY. SOME OF THE STORMS COULD BECOME SEVERE IN THE SLIGHT RISK AREA. AGAIN...THE SLIGHT RISK WILL BE EXTENDED INTO CNTRL AND NERN TX FOR THE DAY 1 PERIOD. ..BROYLES.. 05/01/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LCH...SHV...HGX...FWD...OUN...EWX...SJT... 31219924 31969951 32879869 34079745 34939630 33379598 32349405 32319204 30969455 30219605 30139764 30869913
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 7:30 PM CDT | Severe Thunderstorm Watch | SPC | Garfield, Grant, Kay, Logan, Noble, Osage and 2 more | 6 hr |
| Apr 30, 8:17 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Caddo, Canadian, Comanche, Cotton and 14 more | 88 min |
| Apr 30, 9:52 PM CDT | Mesoscale Discussion | SPC | Garfield, Grant, Kay, Logan, Noble, Osage and 2 more | 83 min |
| Apr 30, 11:47 PM CDT | Mesoscale Discussion | SPC | Garfield, Grant, Kay, Logan, Noble, Osage and 2 more | 118 min |
| May 1, 12:10 AM CDT | Severe Thunderstorm Watch | SPC | Craig, Garfield, Grant, Kay, Noble, Nowata and 4 more | 5 hr |
| May 1, 2:27 AM CDT | Mesoscale Discussion | SPC | Craig, Delaware, Mayes, Nowata, Osage, Ottawa and 2 more | 2 hr |
| May 1, 2:13 PM CDT | Mesoscale Discussion | SPC | Choctaw, Haskell, Latimer, LeFlore, McCurtain, McIntosh and 4 more | 3 hr |
| May 1, 3:45 PM CDT | Tornado Watch | SPC | Adair, Cherokee, Choctaw, Delaware, Haskell, Latimer and 11 more | 5 hr |
| May 1, 6:58 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Choctaw, Delaware, Haskell, Latimer and 12 more | 92 min |
| May 1, 2:33 PM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Burnet, Camp, Comanche, Concho and 34 more | 117 min |
| May 1, 2:55 PM CDT | Tornado Watch | SPC | Bosque, Bowie, Brown, Burnet, Camp, Collin and 35 more | 5 hr |
| May 1, 6:10 PM CDT | Mesoscale Discussion | SPC | Bosque, Burnet, Camp, Collin, Comanche, Coryell and 31 more | 95 min |
Nearby
Mesoscale Discussions in Texas, 2003Mesoscale Discussions in Oklahoma, 2003Mesoscale Discussions in Louisiana, 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.