Severe Thunderstorm Warnings in Louisiana
17,589 severe thunderstorm warnings since 1986. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Severe Thunderstorm Warnings
- 17,589
- Busiest year
- 1995752 severe thunderstorm warnings
- Average year
- 429over 41 years on file
Over time
By year
Before October 2007 these were issued for whole counties, and a storm crossing three counties was often three warnings; since then one polygon follows the storm. The count changed with the practice, not only with the weather.
By month of the year
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
From 2008 to 2025, 73% of hail, wind and damage reports in Louisiana fell inside a severe thunderstorm warning issued on average 23 minutes before, and 55% of the severe thunderstorm warnings had no report inside them.
Severe thunderstorm warnings by year
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| 2008 | 561 | 214 | 62% | 496 | 66% | 22 min |
| 2009 | 563 | 207 | 63% | 467 | 74% | 24 min |
| 2010 | 370 | 147 | 60% | 310 | 69% | 20 min |
| 2011 | 558 | 283 | 49% | 661 | 68% | 23 min |
| 2012 | 527 | 269 | 49% | 531 | 78% | 24 min |
| 2013 | 358 | 164 | 54% | 412 | 76% | 23 min |
| 2014 | 330 | 150 | 55% | 321 | 74% | 23 min |
| 2015 | 396 | 196 | 51% | 452 | 72% | 22 min |
| 2016 | 403 | 159 | 61% | 384 | 67% | 21 min |
| 2017 | 410 | 190 | 54% | 443 | 65% | 22 min |
| 2018 | 388 | 176 | 55% | 381 | 70% | 23 min |
| 2019 | 497 | 220 | 56% | 438 | 66% | 23 min |
| 2020 | 384 | 192 | 50% | 463 | 73% | 24 min |
| 2021 | 359 | 115 | 68% | 294 | 62% | 23 min |
| 2022 | 333 | 145 | 56% | 338 | 68% | 21 min |
| 2023 | 728 | 316 | 57% | 726 | 82% | 23 min |
| 2024 | 570 | 286 | 50% | 646 | 83% | 26 min |
| 2025 | 693 | 353 | 49% | 595 | 84% | 20 min |
Years from 2008, the first full year of storm-based warnings. The year still running is on its own page.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Caddo Parish1,180
- Bossier Parish1,093
- Tangipahoa Parish881
- Saint Tammany Parish878
- Natchitoches Parish853
- De Soto Parish848
- Bienville Parish805
- Webster Parish794
- Calcasieu Parish761
- Claiborne Parish729
- Winn Parish713
- Beauregard Parish709
- Washington Parish709
- Union Parish702
- Sabine Parish700
- Livingston Parish691
- Madison Parish671
- Rapides Parish670
- Tensas Parish666
- Morehouse Parish661
- Vernon Parish643
- East Carroll Parish627
- Lincoln Parish596
- Franklin Parish593
- Lafourche Parish592
- Jackson Parish590
- Concordia Parish583
- Ouachita Parish572
- East Baton Rouge Parish572
- Red River Parish570
- Allen Parish557
- Richland Parish550
- Jefferson Parish542
- Cameron Parish541
- Catahoula Parish539
- West Carroll Parish535
- Grant Parish505
- Saint Landry Parish503
- Saint Helena Parish499
- East Feliciana Parish485
24 more counties
- Pointe Coupee Parish475
- Jefferson Davis Parish469
- Iberville Parish468
- Plaquemines Parish459
- West Feliciana Parish451
- Saint Martin Parish445
- Avoyelles Parish443
- Evangeline Parish443
- Caldwell Parish432
- Acadia Parish426
- Ascension Parish423
- Saint Charles Parish421
- LaSalle Parish405
- Orleans Parish401
- West Baton Rouge Parish396
- Vermilion Parish385
- Saint John the Baptist Parish368
- Saint Bernard Parish367
- Terrebonne Parish366
- Lafayette Parish326
- Saint James Parish324
- Assumption Parish296
- Iberia Parish295
- St. Mary Parish261
The latest severe thunderstorm warnings
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 22, 3:28 PM CDT | Severe Thunderstorm Warning | SHV | Ouachita, Union | 31 min |
| Sep 22, 1:38 PM CDT | Severe Thunderstorm Warning | JAN | Catahoula, Concordia | 67 min |
| Sep 21, 7:15 PM CDT | Severe Thunderstorm Warning | LIX | Saint Charles, Saint John the Baptist | 37 min |
| Sep 21, 6:28 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany, Tangipahoa | 24 min |
| Sep 21, 6:14 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany | 20 min |
| Sep 21, 5:59 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany | 52 min |
| Sep 21, 5:35 PM CDT | Severe Thunderstorm Warning | LIX | Washington | 55 min |
| Sep 21, 5:31 PM CDT | Severe Thunderstorm Warning | LIX | Assumption, Iberville | 49 min |
| Sep 21, 5:12 PM CDT | Severe Thunderstorm Warning | LIX | Washington | 63 min |
| Sep 21, 4:46 PM CDT | Severe Thunderstorm Warning | LIX | Iberville, West Baton Rouge | 59 min |
| Sep 21, 4:30 PM CDT | Severe Thunderstorm Warning | SHV | De Soto, Sabine | 15 min |
| Sep 14, 6:33 PM CDT | Severe Thunderstorm Warning | LCH | Beauregard | 31 min |
Nearby
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.