Alert archive / Louisiana / Mesoscale Discussions in 2008
Mesoscale Discussion 2012
The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2008, 10:50 AM CDT for 27 parishes in Louisiana; 18 counties in Mississippi; 15 counties in Texas. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Aug 3, 2008, 10:50 AM CDT (15:50 UTC)
- Expired
- Aug 3, 2008, 11:45 AM CDT
- In force
- 55 min
- Issued by
- the Storm Prediction Center
All 60 counties
Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Natchitoches Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Tensas Parish, LA, Vernon Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Attala County, MS, Choctaw County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Issaquena County, MS, Jefferson County, MS, Leake County, MS, Madison County, MS, Rankin County, MS, Sharkey County, MS, Warren County, MS, Webster County, MS, Wilkinson County, MS, Yazoo County, MS, Angelina County, TX, Chambers County, TX, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Trinity County, TX, Tyler County, TX
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 3.8 hours before the alert went out and 118 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
- 87 J/kg
- Mixed-layer CIN
- -387 J/kg
- Mixed-layer LCL
- 1831 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- -35 m²/s²
- 0-3 km storm-relative helicity
- -10 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 031551 SWOMCD SPC MCD 031550 MSZ000-LAZ000-TXZ000-031645- MESOSCALE DISCUSSION 2012 NWS STORM PREDICTION CENTER NORMAN OK 1050 AM CDT SUN AUG 03 2008 AREAS AFFECTED...PORTIONS OF MS/LA/SERN TX CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 031550Z - 031645Z CONVECTION HAS ALREADY INITIATED THIS MORNING OVER PORTIONS OF MS/LA. EXPECTATION IS THAT STORMS WILL GRADUALLY INCREASE IN COVERAGE AND INTENSITY OVER THE NEXT FEW HOURS AS CINH IS OVERCOME. MAIN THREAT WITH THESE STORMS WILL BE DMGG WINDS AS THEY MOVE TO THE WSW...ALTHOUGH LARGE HAIL MAY BE POSSIBLE AS WELL. AREA WILL BE MONITORED FOR A POTENTIAL WW. SHEAR AXIS REMAINS OVER PORTIONS OF MS/AL/SERN TX WITH SOMEWHAT STRONGER FLOW AND DIVERGENCE ALOFT. RATHER COOL BOUNDARY LAYER REMAINS FOLLOWING YESTERDAYS MCS...ALTHOUGH NLY/NELY FLOW ATOP THIS LAYER HAS INFLUENCED THUNDERSTORM DEVELOPMENT IN SLIGHT WAA REGIME AND A SUBTLE WSW TO ENE ORIENTED AREA OF LOW LEVEL CONVERGENCE. TEMPERATURES ARE EXPECTED TO REACH INTO THE UPPER 90S ACROSS A WIDESPREAD AREA TODAY...AND AS HEATING CONTINUES THE REMAINING CINH SHOULD GRADUALLY BE OVERCOME...ALLOWING STORMS TO ROOT IN THE BOUNDARY LAYER. VAD WIND PROFILE DATA AT LAKE CHARLES AND SURROUNDING SITES INDICATE A MODEST NELY LOW LEVEL FLOW NEAR 30 KTS STILL EXISTS. DMGG WINDS WILL BE LIKELY IN COLD POOLS/OUTFLOW DOMINATED STORMS THAT WILL MOVE WSW INTO GREATER INSTABILITY AND INITIATE NEW CONVECTION. ADDITIONAL AREA OF INTEREST LIES WITH A SUBTLE MCV...NOTED ON SATELLITE IMAGERY JUST OFFSHORE WSW OF LCH. CONVECTIVE TRENDS WILL CONTINUE TO BE MONITORED OVER THE AREA AND A WW WILL BE POSSIBLE OVER THE NEXT FEW HOURS. ..HURLBUT.. 08/03/2008 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MEG...JAN...LIX...LCH...SHV...HGX... 29099454 30079512 31409540 32559162 33778905 33178897 31029109 29249310
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 7:52 PM CDT | Severe Thunderstorm Watch | SPC | Catahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more | 6 hr |
| Aug 2, 10:57 PM CDT | Mesoscale Discussion | SPC | East Carroll, Madison, Tensas, West Carroll | 93 min |
| Aug 3, 1:17 AM CDT | Mesoscale Discussion | SPC | Avoyelles, Bienville, Caldwell, Catahoula, Grant, Jackson and 6 more | 58 min |
| Aug 3, 1:07 PM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 24 more | 7 hr |
| Aug 3, 4:21 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 28 more | 54 min |
| Aug 3, 6:44 PM CDT | Severe Thunderstorm Watch | SPC | Bienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 3 more | 3 hr |
| Aug 2, 7:27 PM CDT | Mesoscale Discussion | SPC | Attala, Benton, Calhoun, Carroll, Chickasaw, Choctaw and 21 more | 2 hr |
| Aug 3, 3:09 PM CDT | Mesoscale Discussion | SPC | Bolivar, Carroll, Coahoma, Grenada, Holmes, Humphreys and 9 more | 66 min |
| Aug 3, 5:27 PM CDT | Mesoscale Discussion | SPC | Anderson, Cherokee, Freestone, Gregg, Harrison, Henderson and 8 more | 63 min |
Nearby
Mesoscale Discussions in Louisiana, 2008Mesoscale Discussions in Mississippi, 2008Mesoscale Discussions in Texas, 2008Every mesoscale discussion in 2008
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.