Alert archive / Louisiana / Mesoscale Discussions in 2026
Mesoscale Discussion 628
The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2026, 12:02 PM CDT for 30 parishes in Louisiana; Newton County, Orange County, Texas. It was in force for 118 min.
The area
The outline as issued.
The facts
- Issued
- Apr 30, 2026, 12:02 PM CDT (17:02 UTC)
- Expired
- Apr 30, 2026, 2:00 PM CDT
- In force
- 118 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 5%
All 32 counties
Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Pointe Coupee Parish, LA, Saint Bernard Parish, LA, Saint Charles 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, Terrebonne Parish, LA, Vermilion Parish, LA, West Baton Rouge Parish, LA, Newton County, TX, Orange County, TX
The radar
The Hammond radar (KHDC), 138 km from the middle of the area, began a volume at 17:03 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
Slidell Radar S, LA (KSIL), launched 12:00Z, 5.0 hours before the alert went out and 192 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
- 163 J/kg
- Mixed-layer CIN
- -149 J/kg
- Mixed-layer LCL
- 1055 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 147 m²/s²
- 0-3 km storm-relative helicity
- 151 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.0
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 29, 8:39 PM CDT | Mesoscale Discussion | SPC | Bandera, Dimmit, Edwards, Frio, Kinney, La Salle and 6 more | 96 min |
| Apr 30, 10:49 AM CDT | Mesoscale Discussion | SPC | Bell, Brazos, Burleson, Burnet, Concho, Coryell and 15 more | 116 min |
| Apr 30, 3:47 PM CDT | Mesoscale Discussion | SPC | Bandera, Crockett, Edwards, Gillespie, Kerr, Kimble and 8 more | 118 min |
Nearby
Mesoscale Discussions in Louisiana, 2026Mesoscale Discussions in Texas, 2026Every mesoscale discussion in 2026
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.