Weather alerts in Louisiana, 2019
3,905 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 3,905
- Warnings
- 1,759
- Watches
- 104
- Advisories
- 608
- Busiest month
- April751 alerts
- Busiest day
- April 18, 2019125 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
46 of 206 tornado warnings covering Louisiana in 2019 had a tornado report inside them; 81 of 122 tornado reports fell inside a warning, on average 13 minutes after it went out.
Louisiana, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 206 | 46 | 78% | 122 | 66% | 13 min |
| Severe thunderstorm warnings | 497 | 220 | 56% | 438 | 66% | 23 min |
| Flash flood warnings | 136 | 74 | 46% | 159 | 84% | 98 min |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Jackson, MS: tornado warnings | 122 | 50 | 59% | 184 | 84% | 23 min |
| NWS Jackson, MS: severe thunderstorm warnings | 404 | 246 | 39% | 711 | 74% | 26 min |
| NWS Jackson, MS: flash flood warnings | 117 | 78 | 33% | 278 | 81% | 88 min |
| NWS New Orleans, LA: tornado warnings | 117 | 16 | 86% | 41 | 66% | 10 min |
| NWS New Orleans, LA: severe thunderstorm warnings | 178 | 42 | 76% | 131 | 51% | 17 min |
| NWS New Orleans, LA: flash flood warnings | 41 | 14 | 66% | 27 | 81% | 71 min |
| NWS Shreveport, LA: tornado warnings | 92 | 24 | 74% | 60 | 73% | 16 min |
| NWS Shreveport, LA: severe thunderstorm warnings | 327 | 180 | 45% | 449 | 72% | 23 min |
| NWS Shreveport, LA: flash flood warnings | 47 | 32 | 32% | 90 | 82% | 115 min |
| NWS Lake Charles, LA: tornado warnings | 71 | 14 | 80% | 34 | 59% | 17 min |
| NWS Lake Charles, LA: severe thunderstorm warnings | 119 | 42 | 65% | 124 | 68% | 25 min |
| NWS Lake Charles, LA: flash flood warnings | 99 | 56 | 43% | 131 | 91% | 97 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
3,905 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.
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Beauregard Parish217
- Allen Parish215
- Caddo Parish210
- Natchitoches Parish208
- Bossier Parish203
- Calcasieu Parish196
- De Soto Parish195
- Tangipahoa Parish194
- Cameron Parish193
- Saint Martin Parish191
- East Baton Rouge Parish190
- Red River Parish186
- Union Parish186
- Washington Parish185
- Evangeline Parish184
- Winn Parish183
- Sabine Parish181
- Rapides Parish180
- Bienville Parish179
- Webster Parish178
- Vernon Parish173
- Grant Parish172
- Lincoln Parish172
- Ouachita Parish171
- Saint Tammany Parish168
- Saint Landry Parish166
- Jackson Parish164
- Saint Helena Parish164
- Avoyelles Parish162
- Lafayette Parish160
- Saint John the Baptist Parish159
- Jefferson Davis Parish157
- Livingston Parish156
- LaSalle Parish154
- Caldwell Parish153
- East Feliciana Parish153
- Claiborne Parish149
- Tensas Parish142
- Saint Bernard Parish140
- Morehouse Parish140
24 more counties
- Saint James Parish140
- Madison Parish137
- Iberville Parish135
- Concordia Parish134
- West Feliciana Parish134
- Acadia Parish133
- West Baton Rouge Parish131
- East Carroll Parish129
- Ascension Parish129
- Assumption Parish128
- Orleans Parish128
- West Carroll Parish127
- Richland Parish126
- Franklin Parish125
- Catahoula Parish122
- Pointe Coupee Parish118
- Jefferson Parish110
- Saint Charles Parish102
- Lafourche Parish90
- Vermilion Parish85
- Plaquemines Parish74
- Terrebonne Parish66
- St. Mary Parish61
- Iberia Parish58
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20182020
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.