Alert archive / Louisiana / Mesoscale Discussions in 2005

Mesoscale Discussion 466

March 31, 200522 parishes in Louisiana; 6 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2005, 6:49 PM CST for 22 parishes in Louisiana; 6 counties in Texas. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Mar 31, 2005, 6:49 PM CST (00:49 UTC)
Expired: Mar 31, 2005, 7:45 PM CST
In force: 56 min
Issued by: the Storm Prediction Center

All 28 counties

Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Calcasieu Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA, 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.

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 0.8 hours before the alert went out and 95 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2484 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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, 7:05 PM CST	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 17 more	5 hr
Mar 31, 8:25 PM CST	Mesoscale Discussion	SPC	Acadia, Calcasieu, Cameron, Jefferson Davis, Vermilion	65 min
Mar 31, 8:45 PM CST	Severe Thunderstorm Watch	SPC	Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 4 more	7 hr
Mar 31, 8:59 PM CST	Mesoscale Discussion	SPC	Ascension, Catahoula, Concordia, East Baton Rouge, East Feliciana, Iberville and 8 more	61 min
Mar 31, 9:27 PM CST	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 15 more	63 min
Mar 31, 10:53 PM CST	Mesoscale Discussion	SPC	Avoyelles, Bienville, Bossier, Caddo, Caldwell, Catahoula and 29 more	67 min
Mar 31, 11:15 PM CST	Tornado Watch	SPC	Avoyelles, Bienville, Caldwell, Catahoula, Claiborne, Concordia and 27 more	8 hr
Apr 1, 12:25 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Beauregard, Calcasieu, Cameron, Jefferson Davis and 3 more	95 min
Apr 1, 1:29 AM CST	Mesoscale Discussion	SPC	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Tammany	2 hr
Apr 1, 2:05 AM CST	Tornado Watch	SPC	Orleans, Saint Bernard, Saint Tammany, Washington	5 hr
Apr 1, 4:14 AM CST	Mesoscale Discussion	SPC	Saint Helena, Tangipahoa, Washington	2 hr
Mar 31, 7:07 PM CST	Mesoscale Discussion	SPC	Anderson, Bowie, Camp, Cass, Cherokee, Delta and 28 more	113 min

Nearby

Mesoscale Discussions in Louisiana, 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.