Alert archive / Louisiana / Mesoscale Discussions in 2004

Mesoscale Discussion 2450

November 23, 200444 parishes in Louisiana; 10 counties in Mississippi; 7 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 23, 2004, 10:01 PM CST for 44 parishes in Louisiana; 10 counties in Mississippi; 7 counties in Texas. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Nov 23, 2004, 10:01 PM CST (04:01 UTC)
Expired: Nov 24, 2004, 12:00 AM CST
In force: 119 min
Issued by: the Storm Prediction Center

All 61 counties

Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Livingston Parish, LA, Madison Parish, LA, Natchitoches Parish, LA, Ouachita 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, Saint Martin Parish, LA, St. Mary Parish, LA, Tensas Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, West Baton Rouge Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Issaquena County, MS, Jefferson County, MS, Lincoln County, MS, Warren County, MS, Wilkinson County, MS, Chambers County, TX, Galveston County, TX, Jasper County, TX, Jefferson County, TX, Newton County, TX, Orange County, TX, Sabine County, TX

The radar

The Lake Charles radar (KLCH), 60 km from the middle of the area, began a volume at 04:02 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

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 00:00Z, 4.0 hours before the alert went out and 59 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: 1863 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 691 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 177 m²/s²
0-3 km storm-relative helicity: 209 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 8.1

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
Nov 23, 7:50 PM CST	Tornado Watch	SPC	Sabine	6 hr
Nov 23, 7:53 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 20 more	37 min
Nov 23, 8:15 PM CST	Tornado Watch	SPC	Allen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 21 more	6 hr
Nov 23, 9:14 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Catahoula, Concordia, East Carroll and 7 more	2 hr
Nov 23, 11:00 PM CST	Severe Thunderstorm Watch	SPC	Acadia, Ascension, Assumption, Calcasieu, Cameron, Iberia and 15 more	7 hr
Nov 24, 12:30 AM CST	Mesoscale Discussion	SPC	Saint Tammany, Tangipahoa, Washington	30 min
Nov 24, 12:45 AM CST	Tornado Watch	SPC	Saint Helena, Tangipahoa, Washington	5 hr
Nov 24, 1:28 AM CST	Mesoscale Discussion	SPC	Avoyelles, Concordia, East Baton Rouge, East Carroll, East Feliciana, Evangeline and 9 more	32 min
Nov 24, 1:45 AM CST	Tornado Watch	SPC	East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Landry and 2 more	4 hr
Nov 24, 2:43 AM CST	Mesoscale Discussion	SPC	Tangipahoa, Washington	62 min
Nov 24, 2:50 AM CST	Tornado Watch	SPC	Ascension, Assumption, East Baton Rouge, Iberville, Jefferson, Lafourche and 11 more	3 hr
Nov 24, 5:35 AM CST	Mesoscale Discussion	SPC	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard	25 min
Nov 24, 5:55 AM CST	Tornado Watch	SPC	Plaquemines, Saint Bernard	2 hr
Nov 23, 6:35 PM CST	Tornado Watch	SPC	Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 28 more	7 hr
Nov 23, 9:00 PM CST	Mesoscale Discussion	SPC	Alcorn, Itawamba, Prentiss, Tishomingo	2 hr
Nov 23, 9:20 PM CST	Tornado Watch	SPC	Itawamba, Lowndes, Monroe, Tishomingo	7 hr
Nov 24, 3:35 AM CST	Mesoscale Discussion	SPC	Lowndes	25 min
Nov 24, 4:57 AM CST	Mesoscale Discussion	SPC	Clarke, Forrest, George, Greene, Lamar, Pearl River and 3 more	63 min
Nov 24, 5:20 AM CST	Tornado Watch	SPC	George, Jackson	6 hr
Nov 24, 10:16 AM CST	Mesoscale Discussion	SPC	Alcorn, Benton, Lafayette, Marshall, Prentiss, Tippah and 1 more	2 hr
Nov 23, 6:23 PM CST	Mesoscale Discussion	SPC	Anderson, Angelina, Bastrop, Bell, Brazos, Burleson and 23 more	2 hr
Nov 23, 7:17 PM CST	Mesoscale Discussion	SPC	Angelina, Austin, Brazoria, Calhoun, Chambers, Cherokee and 35 more	58 min
Nov 23, 7:31 PM CST	Mesoscale Discussion	SPC	Carson, Hansford, Hutchinson, Lipscomb, Moore, Ochiltree and 3 more	5 hr

Nearby

Mesoscale Discussions in Louisiana, 2004 Mesoscale Discussions in Mississippi, 2004 Mesoscale Discussions in Texas, 2004 Every mesoscale discussion in 2004

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; radar from the NEXRAD Level II archive.