Alert archive / Louisiana / Mesoscale Discussions in 2018
Mesoscale Discussion 219
The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2018, 11:33 PM CDT for 20 parishes in Louisiana; 11 counties in Mississippi; 4 counties in Texas. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Apr 3, 2018, 11:33 PM CDT (04:33 UTC)
- Expired
- Apr 4, 2018, 12:30 AM CDT
- In force
- 57 min
- Issued by
- the Storm Prediction Center
All 35 counties
Acadia Parish, LA, Ascension Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Tangipahoa Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Clarke County, MS, Forrest County, MS, Jones County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Walthall County, MS, Wayne County, MS, Brazoria County, TX, Chambers County, TX, Galveston County, TX, Jefferson County, TX
The radar
The Lake Charles radar (KLCH), 85 km from the middle of the area, began a volume at 04:33 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 00:00Z, 4.6 hours before the alert went out and 84 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.
- Mixed-layer CAPE
- 1661 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 630 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 6.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 7:43 PM CDT | Mesoscale Discussion | SPC | Catahoula, Concordia, East Carroll, Franklin, LaSalle, Madison and 3 more | 92 min |
| Apr 3, 9:14 PM CDT | Mesoscale Discussion | SPC | Allen, Avoyelles, Beauregard, Calcasieu, Evangeline, Jefferson Davis and 1 more | 91 min |
| Apr 3, 7:14 PM CDT | Severe Thunderstorm Watch | SPC | Alcorn, Benton, Calhoun, Chickasaw, Coahoma, Itawamba and 14 more | 5 hr |
| Apr 3, 8:13 PM CDT | Severe Thunderstorm Watch | SPC | Attala, Choctaw, Clarke, Clay, Covington, Jasper and 16 more | 3 hr |
Nearby
Mesoscale Discussions in Louisiana, 2018Mesoscale Discussions in Mississippi, 2018Mesoscale Discussions in Texas, 2018Every 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.