Alert archive / Louisiana / Mesoscale Discussions in 2026
Mesoscale Discussion 545
The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2026, 7:47 AM CDT for 11 parishes in Louisiana; 9 counties in Mississippi. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Apr 26, 2026, 7:47 AM CDT (12:47 UTC)
- Expired
- Apr 26, 2026, 9:15 AM CDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 20%
Counties Ascension Parish, LA, East Baton Rouge Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Forrest County, MS, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Lamar County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS
The radar
The Hammond radar (KHDC), 58 km from the middle of the area, began a volume at 12:47 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, 0.8 hours before the alert went out and 36 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
- 1874 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 681 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 28 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.1
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 25, 9:46 PM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Claiborne, Jackson, Lincoln and 2 more | 119 min |
| Apr 25, 10:12 PM CDT | Severe Thunderstorm Watch | SPC | Bienville, Bossier, Caddo, Claiborne, Jackson, Lincoln and 3 more | 8 hr |
| Apr 25, 11:42 PM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Claiborne, Jackson, Lincoln and 2 more | 2 hr |
| Apr 26, 1:31 AM CDT | Mesoscale Discussion | SPC | Claiborne, Lincoln, Ouachita, Union, Webster | 89 min |
| Apr 26, 8:03 AM CDT | Mesoscale Discussion | SPC | Caddo, De Soto, Red River | 87 min |
Nearby
Mesoscale Discussions in Louisiana, 2026Mesoscale Discussions in Mississippi, 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.