Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 234

March 13, 200314 parishes in Louisiana; 15 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 13, 2003, 7:52 AM CST for 14 parishes in Louisiana; 15 counties in Texas. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Mar 13, 2003, 7:52 AM CST (13:52 UTC)
Expired: Mar 13, 2003, 9:45 AM CST
In force: 113 min
Issued by: the Storm Prediction Center

All 29 counties

Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Austin County, TX, Brazoria County, TX, Chambers County, TX, Colorado County, TX, Fort Bend County, TX, Galveston County, TX, Hardin County, TX, Harris County, TX, Jefferson County, TX, Liberty County, TX, Montgomery County, TX, Newton County, TX, Orange County, TX, Waller County, TX, Wharton 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 1.9 hours before the alert went out and 94 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: 2612 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 463 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 6.2

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 13, 8:30 AM CST	Severe Thunderstorm Watch	SPC	Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 7 more	6 hr
Mar 13, 8:50 AM CST	Severe Thunderstorm Watch	SPC	Avoyelles, Catahoula, Concordia, East Carroll, Franklin, Madison and 1 more	5 hr
Mar 13, 10:45 AM CST	Severe Thunderstorm Watch	SPC	Ascension, Assumption, East Baton Rouge, Iberia, Iberville, Jefferson and 12 more	5 hr
Mar 13, 10:53 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 5 more	2 hr
Mar 13, 11:29 AM CST	Mesoscale Discussion	SPC	Catahoula, Concordia, East Carroll, Madison, Tensas	2 hr
Mar 13, 1:26 PM CST	Mesoscale Discussion	SPC	Ascension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 5 more	2 hr
Mar 13, 2:15 PM CST	Mesoscale Discussion	SPC	Jefferson, Orleans, Plaquemines, Saint Bernard	2 hr
Mar 13, 3:53 PM CST	Mesoscale Discussion	SPC	Beauregard, Calcasieu	2 hr
Mar 13, 12:56 AM CST	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Delta, Fannin, Franklin and 6 more	2 hr

Nearby

Mesoscale Discussions in Texas, 2003 Mesoscale Discussions in Louisiana, 2003 Every mesoscale discussion in 2003

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.