Weather alerts in Louisiana, 2023
4,513 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.
Weather alerts by county
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Alerts
- 4,513
- Warnings
- 1,947
- Watches
- 173
- Advisories
- 558
- Busiest month
- June1,016 alerts
- Busiest day
- June 20, 2023103 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
22 of 103 tornado warnings covering Louisiana in 2023 had a tornado report inside them; 28 of 45 tornado reports fell inside a warning, on average 12 minutes after it went out.
Louisiana, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 103 | 22 | 79% | 45 | 62% | 12 min |
| Severe thunderstorm warnings | 728 | 316 | 57% | 726 | 82% | 23 min |
| Flash flood warnings | 98 | 45 | 54% | 96 | 85% | 79 min |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Jackson, MS: tornado warnings | 67 | 31 | 54% | 88 | 80% | 19 min |
| NWS Jackson, MS: severe thunderstorm warnings | 595 | 288 | 52% | 926 | 76% | 26 min |
| NWS Jackson, MS: flash flood warnings | 55 | 27 | 51% | 86 | 83% | 85 min |
| NWS New Orleans, LA: tornado warnings | 20 | 4 | 80% | 9 | 67% | 10 min |
| NWS New Orleans, LA: severe thunderstorm warnings | 267 | 72 | 73% | 228 | 77% | 20 min |
| NWS New Orleans, LA: flash flood warnings | 53 | 16 | 70% | 45 | 96% | 90 min |
| NWS Shreveport, LA: tornado warnings | 78 | 20 | 74% | 41 | 61% | 15 min |
| NWS Shreveport, LA: severe thunderstorm warnings | 496 | 303 | 39% | 752 | 86% | 25 min |
| NWS Shreveport, LA: flash flood warnings | 54 | 36 | 33% | 96 | 89% | 72 min |
| NWS Lake Charles, LA: tornado warnings | 40 | 8 | 80% | 31 | 71% | 11 min |
| NWS Lake Charles, LA: severe thunderstorm warnings | 241 | 76 | 68% | 171 | 71% | 22 min |
| NWS Lake Charles, LA: flash flood warnings | 40 | 13 | 68% | 26 | 65% | 66 min |
An office's figures cover every county it serves, including across state lines.
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.
The alerts
4,513 alerts are too many to list on one page. Narrow it to a product above, to a month in the chart, or to a county.
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 728 |
| Tornado Warning | 103 |
| Severe Thunderstorm Watch | 42 |
| Tornado Watch | 33 |
| Mesoscale Discussion | 192 |
| Special Weather Statement | 1,643 |
| Flooding | |
| Areal Flood Warning | 5 |
| Flash Flood Warning | 98 |
| River Flood Warning | 138 |
| Flood Watch | 22 |
| River Flood Watch | 3 |
| Areal Flood Advisory | 101 |
| River Flood Advisory | 4 |
| Winter | |
| Winter Weather Advisory | 3 |
| Heat | |
| Excessive Heat Warning | 95 |
| Excessive Heat Watch | 30 |
| Heat Advisory | 132 |
| Cold | |
| Freeze Warning | 15 |
| Freeze Watch | 9 |
| Wind and dust | |
| High Wind Warning | 4 |
| High Wind Watch | 1 |
| Wind Advisory | 50 |
| Fire | |
| Red Flag Warning | 42 |
| Fire Weather Watch | 10 |
| Fog and smoke | |
| Dense Fog Advisory | 72 |
| Dense Smoke Advisory | 1 |
| Coast and beach | |
| Coastal Flood Warning | 6 |
| Coastal Flood Watch | 4 |
| Coastal Flood Advisory | 24 |
| Marine | |
| Gale Warning | 27 |
| Special Marine Warning | 685 |
| Storm Warning | 1 |
| Gale Watch | 18 |
| Storm Watch | 1 |
| Low Water Advisory | 3 |
| Marine Dense Fog Advisory | 52 |
| Small Craft Advisory | 116 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Saint Tammany Parish358
- Tangipahoa Parish307
- Orleans Parish299
- Bossier Parish289
- Caddo Parish289
- Livingston Parish287
- East Baton Rouge Parish284
- Rapides Parish271
- Washington Parish267
- Saint Helena Parish265
- De Soto Parish259
- Jefferson Parish259
- Calcasieu Parish253
- Vernon Parish252
- East Feliciana Parish251
- West Baton Rouge Parish247
- Ascension Parish245
- Bienville Parish241
- Webster Parish241
- West Feliciana Parish240
- Natchitoches Parish238
- Sabine Parish237
- Saint John the Baptist Parish236
- Iberville Parish235
- Saint James Parish233
- Allen Parish233
- Saint Martin Parish231
- Red River Parish230
- Saint Bernard Parish229
- Assumption Parish228
- Avoyelles Parish228
- Beauregard Parish226
- Lafayette Parish224
- Union Parish223
- Saint Landry Parish223
- Pointe Coupee Parish220
- Cameron Parish217
- Evangeline Parish215
- Winn Parish213
- Ouachita Parish210
24 more counties
- Lincoln Parish209
- Claiborne Parish207
- Jefferson Davis Parish205
- Jackson Parish202
- Grant Parish197
- Tensas Parish197
- Plaquemines Parish194
- Vermilion Parish193
- Morehouse Parish192
- Richland Parish192
- Acadia Parish192
- LaSalle Parish191
- Madison Parish191
- Concordia Parish190
- Franklin Parish188
- East Carroll Parish185
- Caldwell Parish184
- West Carroll Parish181
- Catahoula Parish178
- St. Mary Parish166
- Iberia Parish159
- Lafourche Parish126
- Saint Charles Parish120
- Terrebonne Parish87
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20222024
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.