Alert archive / Louisiana / Mesoscale Discussions in 2013

Mesoscale Discussion 1508

July 24, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Jul 24, 2013, 5:57 PM CDT for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 24, 2013, 5:57 PM CDT (22:57 UTC)
Expired: Jul 24, 2013, 8:30 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 67 counties

Baldwin County, AL, Mobile County, AL, Washington County, AL, Acadia Parish, LA, Allen Parish, LA, Ascension 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, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Rapides 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, Tangipahoa Parish, LA, Vernon Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS, Wilkinson County, MS, Angelina County, TX, Hardin County, TX, Jasper County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, Tyler County, TX

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 11.0 hours before the alert went out and 220 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: 339 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 1082 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -86 m²/s²
0-3 km storm-relative helicity: 5 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 24, 12:48 PM CDT	Mesoscale Discussion	SPC	Baldwin, Barbour, Bullock, Butler, Clarke, Coffee and 14 more	87 min
Jul 23, 8:16 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, Jackson, Lincoln and 3 more	89 min
Jul 24, 12:26 AM CDT	Mesoscale Discussion	SPC	Delta, Franklin, Lamar, Red River, Titus	64 min
Jul 24, 2:32 AM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Collin, Delta, Fannin and 15 more	88 min
Jul 24, 4:47 AM CDT	Mesoscale Discussion	SPC	Clay, Collin, Cooke, Denton, Grayson, Montague and 1 more	58 min
Jul 24, 5:27 PM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Briscoe, Castro, Cochran, Cottle and 17 more	2 hr

Nearby

Mesoscale Discussions in Louisiana, 2013 Mesoscale Discussions in Mississippi, 2013 Mesoscale Discussions in Texas, 2013 Every mesoscale discussion in 2013

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.