Alert archive / Louisiana / Mesoscale Discussions in 2005

Mesoscale Discussion 2264

September 24, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Sep 24, 2005, 5:13 AM CDT for 4 states. It was in force for 32 min.

The area

The outline as issued.

The facts

Issued: Sep 24, 2005, 5:13 AM CDT (10:13 UTC)
Expired: Sep 24, 2005, 5:45 AM CDT
In force: 32 min
Issued by: the Storm Prediction Center

All 92 counties

Mobile County, AL, Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Iberville Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Livingston Parish, LA, Madison Parish, LA, Natchitoches Parish, LA, Orleans Parish, LA, Ouachita Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine 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, Tangipahoa Parish, LA, Tensas Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Washington Parish, LA, Webster 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, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Hinds County, MS, Jackson County, MS, Jasper County, MS, Jefferson 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, Rankin County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Warren County, MS, Wayne County, MS, Wilkinson County, MS, Jasper County, TX, Newton County, TX, Orange County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 812Sep 24, 5:45 AM CDT

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 10.2 hours before the alert went out and 174 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: 160 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 630 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 392 m²/s²
0-3 km storm-relative helicity: 485 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

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
Sep 24, 10:27 AM CDT	Mesoscale Discussion	SPC	Baldwin, Choctaw, Mobile, Washington	2 hr
Sep 24, 12:30 PM CDT	Tornado Watch	SPC	Mobile	3 hr
Sep 24, 2:57 PM CDT	Mesoscale Discussion	SPC	Mobile	93 min
Sep 24, 4:20 PM CDT	Tornado Watch	SPC	Mobile	5 hr
Sep 24, 6:07 PM CDT	Mesoscale Discussion	SPC	Mobile	83 min
Sep 24, 1:36 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, Iberia, Iberville, Jefferson, Lafayette and 9 more	54 min
Sep 24, 5:45 AM CDT	Tornado Watch	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 45 more	7 hr
Sep 24, 12:49 PM CDT	Mesoscale Discussion	SPC	Bossier, Caddo, De Soto, Webster	3 hr
Sep 24, 3:55 PM CDT	Tornado Watch	SPC	Tunica	5 hr
Sep 23, 10:35 PM CDT	Tornado Watch	SPC	Hardin, Jasper, Jefferson, Newton, Orange, Tyler	7 hr

Nearby

Mesoscale Discussions in Louisiana, 2005 Mesoscale Discussions in Mississippi, 2005 Mesoscale Discussions in Texas, 2005 Every mesoscale discussion in 2005

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.