Alert archive / Louisiana / Mesoscale Discussions in 2013

Mesoscale Discussion 355

March 31, 201327 parishes in Louisiana; 24 counties in Mississippi; 14 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2013, 2:32 PM CDT for 27 parishes in Louisiana; 24 counties in Mississippi; 14 counties in Texas. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Mar 31, 2013, 2:32 PM CDT (19:32 UTC)
Expired: Mar 31, 2013, 3:30 PM CDT
In force: 58 min
Issued by: the Storm Prediction Center

All 65 counties

Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Natchitoches Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Tensas Parish, LA, Vernon Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lamar County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Warren County, MS, Wilkinson County, MS, Yazoo County, MS, Angelina County, TX, Hardin County, TX, Jasper 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, Shelby 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

Shreveport, LA (KSHV), launched 12:00Z, 7.5 hours before the alert went out and 136 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: 252 J/kg
Mixed-layer CIN: -155 J/kg
Mixed-layer LCL: 700 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

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
Mar 31, 7:36 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 3 more	114 min
Mar 31, 9:20 AM CDT	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	5 hr
Mar 31, 10:33 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 5 more	57 min
Mar 31, 11:54 AM CDT	Mesoscale Discussion	SPC	Allen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 20 more	36 min
Mar 31, 12:17 PM CDT	Severe Thunderstorm Watch	SPC	Acadia, Allen, Ascension, Avoyelles, Beauregard, Calcasieu and 32 more	6 hr
Mar 31, 2:48 PM CDT	Severe Thunderstorm Watch	SPC	Cameron, Iberia, Saint Martin, St. Mary, Vermilion	5 hr
Mar 31, 3:21 PM CDT	Mesoscale Discussion	SPC	Jefferson, Orleans, Saint Charles, Saint James, Saint John the Baptist, Saint Tammany and 1 more	54 min
Mar 31, 3:38 PM CDT	Severe Thunderstorm Watch	SPC	Assumption, Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard and 5 more	3 hr
Mar 30, 8:14 PM CDT	Mesoscale Discussion	SPC	Clay, Montague, Wichita, Wilbarger	91 min
Mar 31, 1:13 AM CDT	Mesoscale Discussion	SPC	Wheeler	62 min
Mar 31, 4:54 AM CDT	Mesoscale Discussion	SPC	Clay, Collin, Cooke, Delta, Denton, Fannin and 8 more	96 min
Mar 31, 5:10 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bosque, Bowie, Camp, Cass, Cherokee and 44 more	7 hr
Mar 31, 1:00 PM CDT	Mesoscale Discussion	SPC	Austin, Bandera, Bastrop, Bexar, Blanco, Brazos and 32 more	60 min
Mar 31, 1:17 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Austin, Bandera, Bastrop, Bell, Bexar and 47 more	9 hr
Mar 31, 5:24 PM CDT	Mesoscale Discussion	SPC	Atascosa, Brazoria, Chambers, DeWitt, Dimmit, Fort Bend and 18 more	96 min
Mar 31, 6:20 PM CDT	Severe Thunderstorm Watch	SPC	Bee, Duval, Jim Wells, Kleberg, La Salle, Live Oak and 4 more	4 hr

Nearby

Mesoscale Discussions in Louisiana, 2013 Mesoscale Discussions in Mississippi, 2013 Mesoscale Discussions in Texas, 2013 Every mesoscale discussion in 2013

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.