Alert archive / Louisiana / Mesoscale Discussions in 2003
Mesoscale Discussion 237
The Storm Prediction Center issued this mesoscale discussion at Mar 13, 2003, 10:53 AM CST for 11 parishes in Louisiana; 11 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 13, 2003, 10:53 AM CST (16:53 UTC)
- Expired
- Mar 13, 2003, 1:00 PM CST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 22 counties
Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Rapides Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Chambers County, TX, Galveston County, TX, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Newton County, TX, Orange County, TX, Polk County, TX, San Jacinto County, TX, Tyler County, TX
The radar
The Lake Charles radar (KLCH), 76 km from the middle of the area, began a volume at 16:55 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 nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 4.9 hours before the alert went out and 78 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
- 2612 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 463 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 6.2
The text
As transmitted, in the capitals the NWS used until 2016.
568 ACUS11 KWNS 131654 SWOMCD SPC MCD 131653 LAZ000-TXZ000-131900- MESOSCALE DISCUSSION 0237 NWS STORM PREDICTION CENTER NORMAN OK 1053 AM CST THU MAR 13 2003 AREAS AFFECTED...SERN TX INTO SWRN LA CONCERNING...SEVERE THUNDERSTORM WATCH 38... VALID 131653Z - 131900Z THE THREAT OF LARGE HAIL AND DAMAGING WINDS CONTINUES ACROSS SRN HALF OF WW038. LATEST RADAR DATA FROM LCH SHOWS TRAINING CONVECTIVE ELEMENTS CONTINUING TO DEVELOP FROM JUST E OF LCH WWD TO E OF HOU. RELATIVELY STEEP MID-LEVEL LAPSE RATES AND SURFACE DEWPOINTS IN THE UPPER 60S TO AROUND 70 HAVE CONTRIBUTED TO A MODERATELY UNSTABLE AIRMASS WITH MLCAPES APPROACHING 1500-2000 J/KG. LATEST LCH VWP INDICATES A LARGELY UNIDIRECTIONAL PROFILE WITH 500 MB WINDS INCREASING SLIGHTLY OVER THE PAST COUPLE OF HOURS. THE THREAT OF LARGE HAIL AND DAMAGING WINDS WILL CONTINUE ACROSS SRN PORTIONS OF WW038 IN ASSOCIATION WITH AFOREMENTIONED TRAINING TSTMS. THIS POTENTIAL SHOULD INCREASE AS COLD POOL ASSOCIATED WITH CONVECTIVE LINE EXTENDING FROM EVANGELINE PARISH WWD INTO JEFFERSON COUNTY TX ENHANCES LOW-LEVEL CONVERGENCE INVOF COASTAL CONVECTION. ..MEAD.. 03/13/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LCH...SHV...HGX... 30859518 31179456 31449338 31619243 31059204 30409204 29829210 29279418 29139507 29629523 30849518
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 13, 7:52 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 8 more | 113 min |
| Mar 13, 8:30 AM CST | Severe Thunderstorm Watch | SPC | Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 7 more | 6 hr |
| Mar 13, 8:50 AM CST | Severe Thunderstorm Watch | SPC | Avoyelles, Catahoula, Concordia, East Carroll, Franklin, Madison and 1 more | 5 hr |
| Mar 13, 10:45 AM CST | Severe Thunderstorm Watch | SPC | Ascension, Assumption, East Baton Rouge, Iberia, Iberville, Jefferson and 12 more | 5 hr |
| Mar 13, 11:29 AM CST | Mesoscale Discussion | SPC | Catahoula, Concordia, East Carroll, Madison, Tensas | 2 hr |
| Mar 13, 1:26 PM CST | Mesoscale Discussion | SPC | Ascension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 5 more | 2 hr |
| Mar 13, 2:15 PM CST | Mesoscale Discussion | SPC | Jefferson, Orleans, Plaquemines, Saint Bernard | 2 hr |
| Mar 13, 3:53 PM CST | Mesoscale Discussion | SPC | Beauregard, Calcasieu | 2 hr |
| Mar 13, 12:56 AM CST | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Delta, Fannin, Franklin and 6 more | 2 hr |
Nearby
Mesoscale Discussions in Louisiana, 2003Mesoscale 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.