Alert archive / Louisiana / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 271, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at Aug 21, 2026, 4:17 PM CDT for LaSalle Parish, Louisiana. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 21, 2026, 4:17 PM CDT (21:17 UTC)
- Expired
- Aug 21, 2026, 4:57 PM CDT
- In force
- 40 min
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County LaSalle Parish, LA
The radar
The Ft Polk radar (KPOE), 97 km from the middle of the area, began a volume at 21:17 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 21, 3:28 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Jackson, MS (KJAN), launched 12:00Z, 9.3 hours before the alert went out and 209 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
- 1263 J/kg
- Mixed-layer CIN
- -235 J/kg
- Mixed-layer LCL
- 1303 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 135 m²/s²
- 0-3 km storm-relative helicity
- 149 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 12:29 AM CDT | Extreme Heat Warning | SHV | Angelina, Cherokee, Gregg, Harrison, Marion, Nacogdoches and 8 more | 20 hr |
| Aug 21, 11:30 AM CDT | Special Weather Statement | SHV | Bowie | 30 min |
| Aug 21, 4:44 PM CDT | Special Weather Statement | SHV | San Augustine | 46 min |
| Aug 21, 5:16 PM CDT | Special Weather Statement | SHV | Sabine | 44 min |
| Aug 21, 5:18 PM CDT | Special Weather Statement | SHV | San Augustine | 42 min |
| Aug 21, 5:45 PM CDT | Severe Thunderstorm Warning | SHV | Angelina, Nacogdoches, San Augustine | 27 min |
| Aug 21, 6:00 PM CDT | Special Weather Statement | SHV | Shelby | 45 min |
| Aug 21, 6:03 PM CDT | Severe Thunderstorm Warning | SHV | Shelby | 42 min |
| Aug 21, 6:10 PM CDT | Special Weather Statement | SHV | San Augustine | 50 min |
| Aug 21, 6:18 PM CDT | Severe Thunderstorm Warning | SHV | Sabine, San Augustine, Shelby | 42 min |
| Aug 21, 6:24 PM CDT | Severe Thunderstorm Warning | SHV | Angelina | 51 min |
| Aug 21, 6:39 PM CDT | Special Weather Statement | SHV | Shelby | 51 min |
| Aug 21, 2:55 PM CDT | Special Weather Statement | SHV | Caldwell | 35 min |
| Aug 21, 3:08 PM CDT | Special Weather Statement | SHV | Ouachita | 37 min |
| Aug 21, 3:11 PM CDT | Special Weather Statement | SHV | Sabine | 34 min |
| Aug 21, 3:24 PM CDT | Special Weather Statement | SHV | LaSalle | 51 min |
| Aug 21, 4:04 PM CDT | Special Weather Statement | SHV | Caldwell | 41 min |
| Aug 21, 4:06 PM CDT | Special Weather Statement | SHV | LaSalle | 39 min |
| Aug 21, 4:28 PM CDT | Special Weather Statement | SHV | Natchitoches | 47 min |
| Aug 21, 4:39 PM CDT | Special Weather Statement | SHV | Caldwell | 51 min |
| Aug 21, 5:14 PM CDT | Special Weather Statement | SHV | Sabine | 46 min |
| Aug 21, 5:30 PM CDT | Special Weather Statement | SHV | Grant | 45 min |
| Aug 21, 6:07 PM CDT | Severe Thunderstorm Warning | SHV | Grant | 38 min |
| Aug 21, 6:45 PM CDT | Severe Thunderstorm Warning | SHV | Grant, Natchitoches | 60 min |
| Aug 21, 6:50 PM CDT | Special Weather Statement | SHV | Grant | 40 min |
| Aug 20, 10:24 PM CDT | Special Weather Statement | SHV | Nevada | 51 min |
| Aug 20, 11:00 PM CDT | Special Weather Statement | SHV | Howard | 45 min |
| Aug 20, 11:40 PM CDT | Special Weather Statement | SHV | Howard, Sevier | 50 min |
| Aug 21, 9:17 AM CDT | Special Weather Statement | SHV | Sevier | 28 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 2026Every severe thunderstorm warning 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.