Alert archive / Louisiana / Mesoscale Discussions in 2005

Mesoscale Discussion 472

April 1, 20059 parishes in Louisiana; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2005, 12:25 AM CST for 9 parishes in Louisiana; 4 counties in Texas. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Apr 1, 2005, 12:25 AM CST (06:25 UTC)
Expired: Apr 1, 2005, 2:00 AM CST
In force: 95 min
Issued by: the Storm Prediction Center

Counties Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Saint Landry Parish, LA, Vermilion Parish, LA, Hardin County, TX, Jefferson County, TX, Liberty County, TX, Orange County, TX

The radar

The Lake Charles radar (KLCH), 61 km from the middle of the area, began a volume at 06:27 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 nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 6.4 hours before the alert went out and 63 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: 2138 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 681 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 2.5
Supercell composite: 9.6

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, 6:49 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Beauregard, Bienville, Bossier, Caddo and 16 more	56 min
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, 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; radar from the NEXRAD Level II archive.