Alert archive / Louisiana / Mesoscale Discussions in 2018

Mesoscale Discussion 996

July 3, 201836 parishes in Louisiana; 10 counties in Mississippi; 5 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jul 3, 2018, 12:19 PM CDT for 36 parishes in Louisiana; 10 counties in Mississippi; 5 counties in Texas. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Jul 3, 2018, 12:19 PM CDT (17:19 UTC)
Expired: Jul 3, 2018, 2:15 PM CDT
In force: 116 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 51 counties

Allen Parish, LA, Ascension Parish, LA, Avoyelles Parish, LA, Bienville Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Iberville Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Livingston Parish, LA, Natchitoches Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Saint Helena Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Vernon Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Franklin County, MS, Hancock County, MS, Jefferson County, MS, Lincoln County, MS, Pearl River County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS, Harrison County, TX, Panola County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX

The radar

The Ft Polk radar (KPOE), 66 km from the middle of the area, began a volume at 17:19 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 5.3 hours before the alert went out and 167 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: 1603 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 825 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -61 m²/s²
0-3 km storm-relative helicity: 5 m²/s²
Significant tornado parameter: -0.2
Supercell composite: -2.1

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in Louisiana, 2018 Mesoscale Discussions in Mississippi, 2018 Mesoscale Discussions in Texas, 2018 Every mesoscale discussion in 2018

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; radar from the NEXRAD Level II archive.