Alert archive / Louisiana / Mesoscale Discussions in 2008

Mesoscale Discussion 501

March 30, 20088 counties in Arkansas; 33 parishes in Louisiana; 20 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 30, 2008, 6:48 AM CDT for 8 counties in Arkansas; 33 parishes in Louisiana; 20 counties in Texas. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Mar 30, 2008, 6:48 AM CDT (11:48 UTC)
Expired
Mar 30, 2008, 8:45 AM CDT
In force
117 min
Issued by
the Storm Prediction Center
All 61 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Columbia County, AR, Lafayette County, AR, Miller County, AR, Ouachita County, AR, Union County, AR, Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, De Soto Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Bowie County, TX, Camp County, TX, Cass County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Jasper County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Newton County, TX, Panola County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 11.8 hours before the alert went out and 109 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-pSkew-T log-p diagram, Shreveport, LA at 00:00Z on 2008-03-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1009 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 00:00Z on 2008-03-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 88 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1009 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
1126 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
88 m²/s²
0-3 km storm-relative helicity
217 m²/s²
Significant tornado parameter
0.8
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.

IssuedProductOfficeCountiesLasted
Mar 29, 8:11 PM CDTMesoscale DiscussionSPCLafayette, Miller64 min
Mar 30, 12:45 AM CDTMesoscale DiscussionSPCBenton, Boone, Bradley, Calhoun, Carroll, Clark and 44 more2 hr
Mar 30, 9:08 AM CDTMesoscale DiscussionSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 5 more2 hr
Mar 30, 12:11 PM CDTMesoscale DiscussionSPCLafayette2 hr
Mar 30, 3:54 PM CDTMesoscale DiscussionSPCBeauregard, Caddo, De Soto, Natchitoches, Red River, Sabine and 1 more2 hr

Nearby

Mesoscale Discussions in Louisiana, 2008Mesoscale Discussions in Texas, 2008Mesoscale Discussions in Arkansas, 2008Every 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.