Alert archive / Texas / Mesoscale Discussions in 2003
Mesoscale Discussion 417
The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2003, 3:00 PM CDT for 27 counties in Texas. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- Apr 6, 2003, 3:00 PM CDT (20:00 UTC)
- Expired
- Apr 6, 2003, 4:30 PM CDT
- In force
- 90 min
- Issued by
- the Storm Prediction Center
All 27 counties
Anderson County, TX, Brazos County, TX, Cherokee County, TX, Delta County, TX, Freestone County, TX, Grimes County, TX, Henderson County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Leon County, TX, Liberty County, TX, Limestone County, TX, Madison County, TX, Montgomery County, TX, Navarro County, TX, Rains County, TX, Robertson County, TX, San Jacinto County, TX, Smith County, TX, Trinity County, TX, Van Zandt County, TX, Walker County, TX, Waller County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 157 km from the middle of the area, began a volume at 20:03 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, 8.0 hours before the alert went out and 175 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
- 1494 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 662 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 210 m²/s²
- 0-3 km storm-relative helicity
- 292 m²/s²
- Significant tornado parameter
- 2.0
- Supercell composite
- 8.7
The text
As transmitted, in the capitals the NWS used until 2016.
278 ACUS11 KWNS 062000 SWOMCD SPC MCD 062000 TXZ000-062130- MESOSCALE DISCUSSION 0417 NWS STORM PREDICTION CENTER NORMAN OK 0300 PM CDT SUN APR 06 2003 AREAS AFFECTED...PARTS OF ERN TX CONCERNING...TORNADO WATCH 103... VALID 062000Z - 062130Z LOW LEVEL FLOW HAS VEERED ALONG/JUST AHEAD OF APPROACHING DRY LINE THAT EXTENDS ALONG THE I-35 CORRIDOR. TSTMS HAVE BEEN TRYING TO DEVELOP ALONG THIS LINE...BUT ARE HAVING A TOUGH TIME SUSTAINING GIVEN DECREASING SURFACE CONVERGENCE. THERE IS STILL A CHANCE THAT TSTMS WILL DEVELOP WITH TIME ALONG THE DRY LINE IN THE CRS-PRX REGIONS. IF TSTM CAN BECOME SUSTAINED...VERY LARGE HAIL AND ISOLD TORNADOES ARE POSSIBLE. FARTHER SOUTH...FLOW REMAINS BACKED INVOF CONVECTIVE CLUSTER JUST NORTH OF UTS/W OF LFK WITHIN AN AIR MASS CHARACTERIZED BY SURFACE DEW POINTS NEAR 70F. THESE TSTMS...WHILE ALREADY EXHIBITING SUPERCELLULAR CHARACTERISTICS...MAY PRODUCE TORNADOES AND VERY LARGE HAIL... PARTICULARLY AS THEY MOVE EWD TOWARD THE SABINE RIVER INTO WT 101. ..RACY.. 04/06/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...SHV...HGX...FWD... 31739696 33759596 33659533 31999499 30049476 29999617 30809677
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 5, 6:11 PM CST | Mesoscale Discussion | SPC | Baylor, Briscoe, Cottle, Crosby, Dickens, Floyd and 9 more | 64 min |
| Apr 5, 6:35 PM CST | Mesoscale Discussion | SPC | Archer, Clay, Collin, Cooke, Dallas, Delta and 23 more | 115 min |
| Apr 5, 6:40 PM CST | Tornado Watch | SPC | Briscoe, Childress, Cottle, Crosby, Dickens, Fisher and 16 more | 5 hr |
| Apr 5, 8:04 PM CST | Mesoscale Discussion | SPC | Archer, Baylor, Clay, Collin, Cooke, Dallas and 25 more | 116 min |
| Apr 5, 9:20 PM CST | Mesoscale Discussion | SPC | Archer, Camp, Clay, Collin, Cooke, Dallas and 31 more | 55 min |
| Apr 5, 9:35 PM CST | Tornado Watch | SPC | Archer, Bowie, Camp, Cass, Clay, Collin and 38 more | 5 hr |
| Apr 5, 10:26 PM CST | Mesoscale Discussion | SPC | Baylor, Childress, Cottle, Dickens, Fisher, Foard and 11 more | 64 min |
| Apr 5, 11:43 PM CST | Mesoscale Discussion | SPC | Archer, Camp, Clay, Collin, Cooke, Dallas and 31 more | 92 min |
| Apr 6, 3:13 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Camp, Cass, Cherokee, Clay and 39 more | 107 min |
| Apr 6, 3:39 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Camp, Cass, Cherokee, Clay and 39 more | 66 min |
| Apr 6, 4:50 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Brown, Callahan, Coke, Coleman and 27 more | 115 min |
| Apr 6, 5:35 AM CDT | Severe Thunderstorm Watch | SPC | Wichita | 4 hr |
| Apr 6, 9:12 AM CDT | Mesoscale Discussion | SPC | Anderson, Bosque, Camp, Cass, Cherokee, Collin and 41 more | 2 hr |
| Apr 6, 10:20 AM CDT | Mesoscale Discussion | SPC | Bowie, Cass, Harrison, Marion, Morris, Panola | 55 min |
| Apr 6, 10:30 AM CDT | Tornado Watch | SPC | Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 14 more | 6 hr |
| Apr 6, 12:03 PM CDT | Mesoscale Discussion | SPC | Gregg, Harrison, Marion, Panola, Rusk | 117 min |
| Apr 6, 12:40 PM CDT | Tornado Watch | SPC | Anderson, Brazos, Burleson, Cherokee, Collin, Cooke and 33 more | 5 hr |
| Apr 6, 2:55 PM CDT | Severe Thunderstorm Watch | SPC | Bowie, Delta, Lamar, Red River | 5 hr |
| Apr 6, 3:26 PM CDT | Mesoscale Discussion | SPC | Angelina, Nacogdoches, Sabine, San Augustine, Shelby | 2 hr |
| Apr 6, 3:45 PM CDT | Tornado Watch | SPC | Angelina, Gregg, Hardin, Harrison, Jasper, Liberty and 9 more | 5 hr |
| Apr 6, 5:35 PM CDT | Mesoscale Discussion | SPC | Angelina, Gregg, Hardin, Harrison, Jasper, Liberty and 10 more | 115 min |
| Apr 6, 6:23 PM CDT | Mesoscale Discussion | SPC | Newton, Sabine | 97 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.