Alert archive / Louisiana / Mesoscale Discussions in 2007

Mesoscale Discussion 676

May 3, 200737 parishes in Louisiana; 18 counties in Mississippi; 8 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 3, 2007, 8:50 PM CDT for 37 parishes in Louisiana; 18 counties in Mississippi; 8 counties in Texas. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
May 3, 2007, 8:50 PM CDT (01:50 UTC)
Expired
May 3, 2007, 10:15 PM CDT
In force
85 min
Issued by
the Storm Prediction Center
All 63 counties

Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pike County, MS, Rankin County, MS, Simpson County, MS, Walthall County, MS, Warren County, MS, Wilkinson County, MS, Chambers County, TX, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Newton County, TX, Orange County, TX, Tyler 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 00:00Z, 1.8 hours before the alert went out and 115 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, Lake Charles Mun, LA at 00:00Z on 2007-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2608 joules per kilogram.LCLEL10008507005003002001001 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, Lake Charles Mun, LA at 00:00Z on 2007-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 square meters per square second.19395878Sfc1 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
2608 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
589 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
184 m²/s²
Significant tornado parameter
2.4
Supercell composite
12.5

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
May 3, 9:44 PM CDTTornado WatchSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 21 more6 hr
May 3, 11:37 PM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 18 more83 min
May 4, 1:40 AM CDTMesoscale DiscussionSPCAssumption, Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard and 6 more65 min
May 4, 7:40 AM CDTMesoscale DiscussionSPCAscension, Avoyelles, Catahoula, Concordia, East Baton Rouge, East Feliciana and 17 more3 hr
May 4, 11:35 AM CDTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, East Baton Rouge and 27 more85 min
May 3, 7:55 PM CDTMesoscale DiscussionSPCBolivar, Carroll, Coahoma, Grenada, Humphreys, Issaquena and 11 more95 min
May 4, 2:53 PM CDTMesoscale DiscussionSPCChildress, Collingsworth, Donley, Gray, Hall, Hemphill and 2 more2 hr
May 4, 6:13 PM CDTTornado WatchSPCArcher, Baylor, Childress, Collingsworth, Cottle, Dickens and 15 more8 hr

Nearby

Mesoscale Discussions in Louisiana, 2007Mesoscale Discussions in Mississippi, 2007Mesoscale Discussions in Texas, 2007Every mesoscale discussion in 2007

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.