Alert archive / Texas / Mesoscale Discussions in 2003
Mesoscale Discussion 1963
The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2003, 4:50 PM CDT for 4 parishes in Louisiana; 42 counties in Texas. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Jul 22, 2003, 4:50 PM CDT (21:50 UTC)
- Expired
- Jul 22, 2003, 6:15 PM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 46 counties
Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA, Webster Parish, LA, Anderson County, TX, Bosque County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Collin County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Grayson County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Marion County, TX, Morris County, TX, Navarro County, TX, Palo Pinto County, TX, Panola County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Rusk County, TX, Smith County, TX, Somervell County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wise County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 108 km from the middle of the area, began a volume at 21:51 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, 9.8 hours before the alert went out and 102 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
- 735 J/kg
- Mixed-layer CIN
- -323 J/kg
- Mixed-layer LCL
- 1505 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 222151 SWOMCD SPC MCD 222150 LAZ000-ARZ000-TXZ000-222315- MESOSCALE DISCUSSION 1963 NWS STORM PREDICTION CENTER NORMAN OK 0450 PM CDT TUE JUL 22 2003 AREAS AFFECTED...N CNTRL AND NE TX THROUGH NWRN LA CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 222150Z - 222315Z ISOLATED DAMAGING WIND APPEARS TO BE THE MAIN THREAT WITH STORMS DEVELOPING ALONG BOUNDARY DROPPING SWD THROUGH NERN TX...THOUGH SOME HAIL MAY ALSO BE POSSIBLE. AREA IS BEING MONITORED FOR POSSIBLE WW. STORMS ARE EXPECTED TO INCREASE IN COVERAGE ALONG BOUNDARY DROPPING SWD THROUGH NERN TX. CAP HAS WEAKENED AND THE ATMOSPHERE HAS BECOME VERY UNSTABLE S OF THE BOUNDARY WITH MLCAPES TO 3500 J/KG. MODEST NNWLY FLOW ALOFT AND SLY LOW LEVEL FLOW WILL SUPPORT STORMS DEVELOPING SWD WITH TIME. THERMODYNAMIC PROFILES WITH STEEP LAPSE RATES APPEAR FAVORABLE FOR DAMAGING WIND. ..DIAL.. 07/22/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...SHV...FWD...OUN... 33439814 33669711 33579541 33219354 32509268 31799436 31619767 32589875
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 1:42 PM CDT | Mesoscale Discussion | SPC | Avoyelles, Bienville, Caldwell, Catahoula, Concordia, De Soto and 15 more | 2 hr |
| Jul 22, 2:30 PM CDT | Severe Thunderstorm Watch | SPC | Concordia, East Baton Rouge, East Feliciana, Madison, Pointe Coupee, Saint Helena and 4 more | 6 hr |
| Jul 22, 6:21 PM CDT | Mesoscale Discussion | SPC | East Carroll, East Feliciana, Franklin, Madison, Richland, Saint Helena and 5 more | 54 min |
| Jul 22, 5:10 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Camp, Cass, Cherokee, Collin, Dallas and 36 more | 6 hr |
Nearby
Mesoscale Discussions in Texas, 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.