Alert archive / Louisiana / Mesoscale Discussions in 2003

Mesoscale Discussion 432

April 7, 200314 parishes in Louisiana; 5 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2003, 11:02 AM CDT for 14 parishes in Louisiana; 5 counties in Mississippi. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Apr 7, 2003, 11:02 AM CDT (16:02 UTC)
Expired
Apr 7, 2003, 2:00 PM CDT
In force
3 hr
Issued by
the Storm Prediction Center

Counties Acadia Parish, LA, Ascension Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, Iberville Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Saint Helena Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, Forrest County, MS, Lamar County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 4.0 hours before the alert went out and 167 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.

Skew-T log-pSkew-T log-p diagram, Lake Charles Mun, LA at 12:00Z on 2003-04-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1791 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 12:00Z on 2003-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -64 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1791 J/kg
Mixed-layer CIN
-58 J/kg
Mixed-layer LCL
518 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
-64 m²/s²
0-3 km storm-relative helicity
9 m²/s²
Significant tornado parameter
-0.6
Supercell composite
-2.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 6, 8:13 PM CDTMesoscale DiscussionSPCCatahoula, Concordia, Franklin, LaSalle, Tensas2 hr
Apr 7, 9:42 AM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Beauregard, Calcasieu and 16 more3 hr
Apr 7, 10:05 AM CDTSevere Thunderstorm WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 26 more6 hr
Apr 7, 2:13 PM CDTMesoscale DiscussionSPCAcadia, Ascension, Assumption, Calcasieu, Cameron, East Baton Rouge and 20 more3 hr
Apr 7, 2:36 PM CDTMesoscale DiscussionSPCAcadia, Ascension, Assumption, Calcasieu, Cameron, East Baton Rouge and 20 more114 min
Apr 7, 3:40 PM CDTSevere Thunderstorm WatchSPCAcadia, Ascension, Assumption, Calcasieu, Cameron, East Baton Rouge and 22 more5 hr
Apr 7, 5:58 PM CDTMesoscale DiscussionSPCAscension, Assumption, Cameron, Iberia, Iberville, Lafayette and 10 more2 hr
Apr 6, 9:48 PM CDTMesoscale DiscussionSPCClarke, Covington, Jasper, Jefferson Davis, Jones, Kemper and 5 more87 min
Apr 7, 4:49 AM CDTMesoscale DiscussionSPCKemper, Lauderdale, Newton3 hr
Apr 7, 9:11 AM CDTMesoscale DiscussionSPCForrest, George, Greene, Jones, Lamar, Pearl River and 2 more3 hr
Apr 7, 11:25 AM CDTMesoscale DiscussionSPCGeorge, Greene3 hr
Apr 7, 12:07 PM CDTMesoscale DiscussionSPCGeorge, Greene113 min
Apr 7, 12:22 PM CDTMesoscale DiscussionSPCGeorge, Greene113 min

Nearby

Mesoscale Discussions in Louisiana, 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.