Alert archive / Louisiana / Mesoscale Discussions in 2014

Mesoscale Discussion 290

April 4, 201432 parishes in Louisiana; 20 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2014, 7:22 AM CDT for 32 parishes in Louisiana; 20 counties in Mississippi. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
Apr 4, 2014, 7:22 AM CDT (12:22 UTC)
Expired
Apr 4, 2014, 8:45 AM CDT
In force
83 min
Issued by
the Storm Prediction Center
All 52 counties

Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Clarke County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Hancock County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Stone County, MS, Walthall County, MS, Wilkinson County, MS

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 0.4 hours before the alert went out and 144 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 2014-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1241 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 2014-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 95 square meters per square second.19395878Sfc1 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
1241 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
513 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
95 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.6

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 3, 8:44 PM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more31 min
Apr 3, 8:54 PM CDTTornado WatchSPCBienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 5 more7 hr
Apr 4, 12:20 AM CDTMesoscale DiscussionSPCCaldwell, Catahoula, East Carroll, Franklin, LaSalle, Madison and 5 more55 min
Apr 4, 12:40 AM CDTTornado WatchSPCCatahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more5 hr
Apr 4, 12:55 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 4 more95 min
Apr 4, 3:34 AM CDTSevere Thunderstorm WatchSPCAllen, Beauregard, Calcasieu, Caldwell, Cameron, De Soto and 9 more6 hr
Apr 4, 3:45 AM CDTMesoscale DiscussionSPCCaldwell, East Carroll, Franklin, Jackson, Madison, Morehouse and 4 more60 min
Apr 4, 5:04 AM CDTMesoscale DiscussionSPCAcadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 15 more116 min
Apr 4, 5:25 AM CDTSevere Thunderstorm WatchSPCAcadia, Ascension, Assumption, Avoyelles, Catahoula, Concordia and 30 more7 hr
Apr 4, 5:28 AM CDTMesoscale DiscussionSPCCatahoula, Concordia, Madison, Tensas92 min
Apr 4, 5:49 AM CDTMesoscale DiscussionSPCAllen, Beauregard, Calcasieu, Caldwell, De Soto, Franklin and 8 more56 min
Apr 4, 10:12 AM CDTMesoscale DiscussionSPCAcadia, Ascension, Assumption, Avoyelles, Cameron, Catahoula and 28 more63 min
Apr 3, 10:45 PM CDTMesoscale DiscussionSPCBenton, Bolivar, Calhoun, Carroll, Coahoma, DeSoto and 16 more60 min
Apr 4, 2:29 AM CDTMesoscale DiscussionSPCAlcorn, Clay, Itawamba, Lee, Lowndes, Monroe and 3 more31 min
Apr 4, 2:52 AM CDTTornado WatchSPCClay, Kemper, Lauderdale, Lowndes, Neshoba, Newton and 4 more5 hr

Nearby

Mesoscale Discussions in Louisiana, 2014Mesoscale Discussions in Mississippi, 2014Every mesoscale discussion in 2014

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.