Alert archive / Louisiana / Mesoscale Discussions in 2003

Mesoscale Discussion 1814

July 13, 200316 parishes in Louisiana; Adams County, Mississippi; 7 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2003, 4:33 PM CDT for 16 parishes in Louisiana; Adams County, Mississippi; 7 counties in Texas. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Jul 13, 2003, 4:33 PM CDT (21:33 UTC)
Expired: Jul 13, 2003, 6:00 PM CDT
In force: 87 min
Issued by: the Storm Prediction Center

All 24 counties

Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, De Soto Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Tensas Parish, LA, Winn Parish, LA, Adams County, MS, Gregg County, TX, Harrison County, TX, Panola County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Wood County, TX

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 9.6 hours before the alert went out and 22 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: 1819 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 991 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Jul 13, 11:02 AM CDT	Mesoscale Discussion	SPC	Catahoula, Concordia, East Carroll, Franklin, LaSalle, Madison and 4 more	118 min
Jul 13, 1:41 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 10 more	2 hr
Jul 13, 1:55 PM CDT	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 19 more	5 hr
Jul 13, 11:30 AM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Bolivar, Coahoma, DeSoto, Lafayette and 12 more	2 hr
Jul 13, 11:55 AM CDT	Severe Thunderstorm Watch	SPC	Alcorn, Benton, Bolivar, Calhoun, Carroll, Chickasaw and 25 more	6 hr
Jul 13, 3:05 PM CDT	Severe Thunderstorm Watch	SPC	Lowndes	5 hr
Jul 13, 3:53 PM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Bolivar, Calhoun, Carroll, Chickasaw and 24 more	67 min
Jul 13, 5:55 PM CDT	Severe Thunderstorm Watch	SPC	Alcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 33 more	4 hr

Nearby

Mesoscale Discussions in Louisiana, 2003 Mesoscale Discussions in Texas, 2003 Mesoscale Discussions in Mississippi, 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.