Alert archive / Louisiana / Mesoscale Discussions in 2008

Mesoscale Discussion 503

March 30, 2008Lafayette County, Arkansas; 20 parishes in Louisiana; 10 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 30, 2008, 12:11 PM CDT for Lafayette County, Arkansas; 20 parishes in Louisiana; 10 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 30, 2008, 12:11 PM CDT (17:11 UTC)
Expired: Mar 30, 2008, 2:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 31 counties

Lafayette County, AR, Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Calcasieu Parish, LA, De Soto Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Vernon Parish, LA, Webster Parish, LA, Winn Parish, LA, Cass County, TX, Harrison County, TX, Jasper County, TX, Marion County, TX, Nacogdoches County, TX, Newton County, TX, Panola County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 5.2 hours before the alert went out and 121 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: 965 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 833 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 164 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.4

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 29, 8:11 PM CDT	Mesoscale Discussion	SPC	Lafayette, Miller	64 min
Mar 30, 12:45 AM CDT	Mesoscale Discussion	SPC	Benton, Boone, Bradley, Calhoun, Carroll, Clark and 44 more	2 hr
Mar 30, 6:48 AM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Columbia, Lafayette, Miller and 2 more	117 min
Mar 30, 9:08 AM CDT	Mesoscale Discussion	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 5 more	2 hr
Mar 30, 3:54 PM CDT	Mesoscale Discussion	SPC	Beauregard, Caddo, De Soto, Natchitoches, Red River, Sabine and 1 more	2 hr

Nearby

Mesoscale Discussions in Louisiana, 2008 Mesoscale Discussions in Texas, 2008 Mesoscale Discussions in Arkansas, 2008 Every mesoscale discussion in 2008

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.