Alert archive / Texas / Mesoscale Discussions in 2003
Mesoscale Discussion 270
The Storm Prediction Center issued this mesoscale discussion at Mar 17, 2003, 10:27 PM CST for 26 counties in Texas. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 17, 2003, 10:27 PM CST (04:27 UTC)
- Expired
- Mar 18, 2003, 1:30 AM CST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 26 counties
Archer County, TX, Brown County, TX, Callahan County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Hamilton County, TX, Hood County, TX, Jack County, TX, Kerr County, TX, Kimble County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Mills County, TX, Palo Pinto County, TX, Parker County, TX, San Saba County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Wise County, TX, Young County, TX
The nearest sounding before it
Fort Worth, TX (KFWD), launched 00:00Z, 4.5 hours before the alert went out and 187 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
- 401 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 1196 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
437 ACUS11 KWNS 180428 SWOMCD SPC MCD 180427 TXZ000-180730- MESOSCALE DISCUSSION 0270 NWS STORM PREDICTION CENTER NORMAN OK 1027 PM CST MON MAR 17 2003 AREAS AFFECTED...CENTRAL/NRN TX CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 180427Z - 180730Z ...THUNDERSTORMS MAY REDEVELOP ACROSS PORTIONS OF NORTH CENTRAL/WEST CENTRAL TX AFTER MIDNIGHT. LARGE HAIL...OR PERHAPS DAMAGING WINDS COULD EVOLVE FROM THIS ACTIVITY. WW MAY BE REQUIRED AFTER MIDNIGHT... RECENT SATELLITE IMAGERY SUGGEST LEADING EDGE OF UPSTREAM FORCING HAS REACHED 100 LON...SPREADING ENEWD AT ROUGHLY 40 KT PER EXPANDING MID-UPPER LEVEL CLOUDINESS. THIS ACTIVITY APPEARS CONVECTIVE IN NATURE AND WILL SOON SPREAD ACROSS MOIST BOUNDARY LAYER EAST OF THE DRY LINE. THERE IS SOME CONCERN THUNDERSTORMS WILL EVOLVE FROM THIS ELEVATED ACTIVITY...THEN INTENSIFY AND ROOT DOWNWARD INTO MORE UNSTABLE AIR MASS. IN ADDITION...MID LEVEL COOLING SHOULD AID DESTABILIZATION AS EXIT REGION OF UPPER JET SPREADS INTO NORTH CENTRAL TX. LATEST THINKING IS TRAILING LINE OF THUNDERSTORMS ACROSS OK MAY GRADUALLY LIFT ENEWD WITH RENEWED DEVELOPMENT TO THE WEST OF DFW...PERHAPS FROM NEAR BWD TO NEAR SPS. LARGE SCALE PATTERN STRONGLY FAVORS LINEAR DEVELOPMENT WITH POSSIBLE SQUALL LINE EVOLUTION WELL AFTER MIDNIGHT. WW MAY BE REQUIRED AFTER MIDNIGHT. ..DARROW.. 03/18/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FWD...OUN...EWX...SJT... 30880014 33689875 33479669 31689781 29959937
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 17, 8:19 PM CST | Mesoscale Discussion | SPC | Archer, Bosque, Clay, Cooke, Denton, Eastland and 13 more | 86 min |
| Mar 18, 2:03 AM CST | Mesoscale Discussion | SPC | Bell, Bosque, Burnet, Collin, Coryell, Dallas and 23 more | 3 hr |
| Mar 18, 9:36 AM CST | Mesoscale Discussion | SPC | Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 22 more | 3 hr |
| Mar 18, 11:40 AM CST | Tornado Watch | SPC | Angelina, Brazoria, Chambers, Galveston, Hardin, Harris and 13 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.