Alert archive / Louisiana / Mesoscale Discussions in 2014

Mesoscale Discussion 292

April 4, 2014Sumter County, Alabama; 34 parishes in Louisiana; 30 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2014, 10:12 AM CDT for Sumter County, Alabama; 34 parishes in Louisiana; 30 counties in Mississippi. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Apr 4, 2014, 10:12 AM CDT (15:12 UTC)
Expired: Apr 4, 2014, 11:15 AM CDT
In force: 63 min
Issued by: the Storm Prediction Center

All 65 counties

Sumter County, AL, Acadia Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Madison 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, Tensas Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Hinds County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Newton County, MS, Pearl River County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Warren County, MS, Wayne County, MS, Wilkinson County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.2 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 685 J/kg
Mixed-layer CIN: -146 J/kg
Mixed-layer LCL: 733 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 5.3

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.

Issued	Product	Office	Counties	Lasted
Apr 4, 2:29 AM CDT	Mesoscale Discussion	SPC	Colbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 9 more	31 min
Apr 4, 2:52 AM CDT	Tornado Watch	SPC	Blount, Colbert, Cullman, DeKalb, Fayette, Franklin and 17 more	5 hr
Apr 4, 5:28 AM CDT	Mesoscale Discussion	SPC	Bibb, Blount, Cullman, DeKalb, Etowah, Fayette and 16 more	92 min
Apr 4, 7:00 AM CDT	Mesoscale Discussion	SPC	Calhoun, Cherokee, Chilton, Clay, Cleburne, Coosa and 4 more	90 min
Apr 3, 8:44 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	31 min
Apr 3, 8:54 PM CDT	Tornado Watch	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 5 more	7 hr
Apr 4, 12:20 AM CDT	Mesoscale Discussion	SPC	Caldwell, Catahoula, East Carroll, Franklin, LaSalle, Madison and 5 more	55 min
Apr 4, 12:40 AM CDT	Tornado Watch	SPC	Catahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more	5 hr
Apr 4, 12:55 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 4 more	95 min
Apr 4, 3:34 AM CDT	Severe Thunderstorm Watch	SPC	Allen, Beauregard, Calcasieu, Caldwell, Cameron, De Soto and 9 more	6 hr
Apr 4, 3:45 AM CDT	Mesoscale Discussion	SPC	Caldwell, East Carroll, Franklin, Jackson, Madison, Morehouse and 4 more	60 min
Apr 4, 5:04 AM CDT	Mesoscale Discussion	SPC	Acadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 15 more	116 min
Apr 4, 5:25 AM CDT	Severe Thunderstorm Watch	SPC	Acadia, Ascension, Assumption, Avoyelles, Catahoula, Concordia and 30 more	7 hr
Apr 4, 5:49 AM CDT	Mesoscale Discussion	SPC	Allen, Beauregard, Calcasieu, Caldwell, De Soto, Franklin and 8 more	56 min
Apr 4, 7:22 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 26 more	83 min
Apr 3, 10:45 PM CDT	Mesoscale Discussion	SPC	Benton, Bolivar, Calhoun, Carroll, Coahoma, DeSoto and 16 more	60 min

Nearby

Mesoscale Discussions in Louisiana, 2014 Mesoscale Discussions in Mississippi, 2014 Mesoscale Discussions in Alabama, 2014 Every 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.