Alert archive / Louisiana / Mesoscale Discussions in 2003

Mesoscale Discussion 221

March 12, 2003Baldwin County, Mobile County, Alabama; 24 parishes in Louisiana; 7 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 12, 2003, 2:59 PM CST for Baldwin County, Mobile County, Alabama; 24 parishes in Louisiana; 7 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 12, 2003, 2:59 PM CST (20:59 UTC)
Expired: Mar 12, 2003, 5:00 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 33 counties

Baldwin County, AL, Mobile County, AL, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.0 hours before the alert went out and 29 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: 251 J/kg
Mixed-layer CIN: -156 J/kg
Mixed-layer LCL: 643 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

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 12, 10:11 AM CST	Mesoscale Discussion	SPC	Baldwin, Clarke, Escambia, Mobile, Monroe, Washington	3 hr
Mar 12, 2:08 PM CST	Mesoscale Discussion	SPC	Bienville, Bossier, Caldwell, Catahoula, Claiborne, Franklin and 12 more	3 hr

Nearby

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