Alert archive / Louisiana / Mesoscale Discussions in 2003
Mesoscale Discussion 441
The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2003, 5:58 PM CDT for 5 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 7, 2003, 5:58 PM CDT (22:58 UTC)
- Expired
- Apr 7, 2003, 8:00 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 27 counties
Baldwin County, AL, Escambia County, AL, Mobile County, AL, Escambia County, FL, Santa Rosa County, FL, Ascension Parish, LA, Assumption Parish, LA, Cameron Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Vermilion Parish, LA, Hancock County, MS, Harrison County, MS, Jackson County, MS, Chambers County, TX, Galveston County, TX, Jefferson County, TX
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 11.0 hours before the alert went out and 146 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
- 1394 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 592 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 163 m²/s²
- 0-3 km storm-relative helicity
- 212 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 8.4
The text
As transmitted, in the capitals the NWS used until 2016.
829 ACUS11 KWNS 072258 SWOMCD SPC MCD 072258 ALZ000-FLZ000-MSZ000-LAZ000-TXZ000-080100- MESOSCALE DISCUSSION 0441 NWS STORM PREDICTION CENTER NORMAN OK 0558 PM CDT MON APR 07 2003 AREAS AFFECTED...SERN TX...SRN LA...SRN MS...SWRN AL AND THE WRN FL PANHANDLE CONCERNING...SEVERE THUNDERSTORM WATCH 114... VALID 072258Z - 080100Z THREAT FOR LARGE HAIL AND ISOLATED DAMAGING WIND GUSTS EXPECTED TO PERSIST ANOTHER FEW HOURS ALONG MUCH OF THE GULF COASTAL AREA. SCATTERED STORMS WILL CONTINUE DEVELOPING IN MODERATELY UNSTABLE ENVIRONMENT ALONG AN E-W ORIENTED OUTFLOW BOUNDARY NEXT FEW HOURS. TRENDS HAVE BEEN FOR OVERALL INTENSITIES TO DECREASE DURING THE PAST HOUR...AND SOME OF THE STORM ARE BECOMING SLIGHTLY ELEVATED ABOVE THE CONVECTIVE OUTFLOW. THE LOW LEVEL FLOW IS EXPECTED TO REMAIN RELATIVELY WEAK. HOWEVER...DEEP LAYER SHEAR WILL REMAIN SUFFICIENT FOR ORGANIZED STORMS INCLUDING SUPERCELLS AND OCCASIONAL BOW ECHOES. ..DIAL.. 04/07/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MOB...LIX...LCH...HGX... 29089316 28829466 28699508 29369506 29879496 30079328 30579011 30698890 31318722 31268665 30548661 30048664 29748847 29439108 29129324
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 6, 8:13 PM CDT | Mesoscale Discussion | SPC | Bibb, Chilton, Choctaw, Dallas, Fayette, Greene and 8 more | 2 hr |
| Apr 6, 9:48 PM CDT | Mesoscale Discussion | SPC | Autauga, Chilton, Choctaw, Clarke, Dallas, Hale and 6 more | 87 min |
| Apr 6, 10:15 PM CDT | Tornado Watch | SPC | Autauga, Butler, Choctaw, Clarke, Conecuh, Covington and 10 more | 5 hr |
| Apr 6, 11:39 PM CDT | Mesoscale Discussion | SPC | Autauga, Butler, Choctaw, Clarke, Conecuh, Covington and 11 more | 2 hr |
| Apr 7, 1:51 AM CDT | Mesoscale Discussion | SPC | Bullock, Butler, Lowndes, Macon, Montgomery | 54 min |
| Apr 7, 2:55 AM CDT | Tornado Watch | SPC | Autauga, Barbour, Bullock, Chilton, Choctaw, Dallas and 13 more | 4 hr |
| Apr 7, 4:49 AM CDT | Mesoscale Discussion | SPC | Autauga, Chambers, Chilton, Coosa, Dallas, Elmore and 11 more | 3 hr |
| Apr 7, 9:11 AM CDT | Mesoscale Discussion | SPC | Barbour, Coffee, Conecuh, Covington, Crenshaw, Dale and 6 more | 3 hr |
| Apr 7, 9:40 AM CDT | Tornado Watch | SPC | Barbour, Bullock, Macon, Pike, Russell | 5 hr |
| Apr 7, 11:25 AM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more | 3 hr |
| Apr 7, 12:07 PM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more | 113 min |
| Apr 7, 12:22 PM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 6 more | 113 min |
| Apr 7, 3:40 PM CDT | Severe Thunderstorm Watch | SPC | Baldwin, Covington, Escambia, Mobile | 5 hr |
| Apr 7, 9:42 AM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Beauregard, Calcasieu and 16 more | 3 hr |
| Apr 7, 10:05 AM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 26 more | 6 hr |
| Apr 7, 11:02 AM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Cameron, East Baton Rouge, Iberville, Lafayette and 8 more | 3 hr |
| Apr 7, 2:13 PM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Assumption, Calcasieu, Cameron, East Baton Rouge and 20 more | 3 hr |
| Apr 7, 2:36 PM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Assumption, Calcasieu, Cameron, East Baton Rouge and 20 more | 114 min |
| Apr 7, 12:24 PM CDT | Mesoscale Discussion | SPC | Atascosa, Austin, Bastrop, Bee, Bexar, Brazoria and 28 more | 66 min |
| Apr 7, 1:00 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Austin, Bee, Bexar, Brazoria, Caldwell and 23 more | 5 hr |
| Apr 7, 3:36 PM CDT | Mesoscale Discussion | SPC | Edwards, Kinney, Maverick, Real, Uvalde, Val Verde | 114 min |
| Apr 7, 4:35 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Bee, Bexar, Blanco, Caldwell and 22 more | 5 hr |
Nearby
Mesoscale Discussions in Louisiana, 2003Mesoscale Discussions in Alabama, 2003Mesoscale Discussions in Mississippi, 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.