Alert archive / Louisiana / Flash Flood Warnings
Flash Flood Warnings in Louisiana, 2020
94 flash flood warnings in 2020. 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 flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Flash Flood Warnings
- 94
- Busiest month
- October16 flash flood warnings
- Busiest day
- September 23, 202011 flash flood warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
53 of 93 flash flood warnings covering Louisiana in 2020 had a flash flood report inside them; 114 of 139 flash flood reports fell inside a warning, on average 123 minutes after it went out.
Louisiana, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 93 | 53 | 43% | 139 | 82% | 123 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Jackson, MS: flash flood warnings | 108 | 73 | 32% | 276 | 85% | 87 min |
| NWS Lake Charles, LA: flash flood warnings | 44 | 14 | 68% | 46 | 87% | 172 min |
| NWS New Orleans, LA: flash flood warnings | 30 | 11 | 63% | 27 | 70% | 77 min |
| NWS Shreveport, LA: flash flood warnings | 55 | 37 | 33% | 117 | 90% | 105 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
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 2, 3:53 PM CST | Flash Flood Warning | LCH | Avoyelles, Evangeline, Saint Landry | 3 hr |
| Jan 2, 4:27 PM CST | Flash Flood Warning | JAN | Catahoula, Concordia | 3 hr |
| Jan 2, 5:45 PM CST | Flash Flood Warning | LCH | Acadia, Allen, Calcasieu, Evangeline, Jefferson Davis, Saint Landry | 3 hr |
| Jan 2, 6:37 PM CST | Flash Flood Warning | LCH | Avoyelles, Evangeline, Rapides, Saint Landry | 3 hr |
| Jan 14, 3:44 AM CST | Flash Flood Warning | JAN | East Carroll | 4 hr |
| Jan 14, 6:48 AM CST | Flash Flood Warning | JAN | Morehouse, Richland, West Carroll | 3 hr |
| Jan 14, 12:12 PM CST | Flash Flood Warning | SHV | Natchitoches, Sabine | 3 hr |
| Jan 14, 4:11 PM CST | Flash Flood Warning | JAN | Catahoula, Concordia, Tensas | 3 hr |
| Feb 10, 12:53 PM CST | Flash Flood Warning | SHV | Bossier, Caddo, De Soto | 3 hr |
| Feb 10, 1:44 PM CST | Flash Flood Warning | SHV | Bienville, Bossier, Claiborne, Webster | 3 hr |
| Feb 10, 2:19 PM CST | Flash Flood Warning | SHV | Claiborne, Jackson, Lincoln, Union | 3 hr |
| Feb 10, 2:44 PM CST | Flash Flood Warning | JAN | East Carroll, Morehouse, Richland, West Carroll | 3 hr |
| Feb 10, 7:54 PM CST | Flash Flood Warning | SHV | Bienville, Claiborne, Lincoln, Union, Webster | 2 hr |
| Mar 4, 8:44 AM CST | Flash Flood Warning | SHV | Bossier, Caddo, De Soto, Webster | 3 hr |
| Mar 4, 9:51 AM CST | Flash Flood Warning | SHV | Bossier, Caddo, De Soto, Red River | 4 hr |
| Mar 4, 11:12 AM CST | Flash Flood Warning | SHV | De Soto, Sabine | 3 hr |
| Apr 19, 1:01 PM CDT | Flash Flood Warning | SHV | Ouachita | 5 hr |
| Apr 22, 4:43 PM CDT | Flash Flood Warning | SHV | De Soto | 3 hr |
| Apr 22, 4:45 PM CDT | Flash Flood Warning | SHV | De Soto, Sabine | 3 hr |
| Apr 22, 5:22 PM CDT | Flash Flood Warning | SHV | Bienville, Bossier, Caddo, De Soto, Jackson, Lincoln and 2 more | 3 hr |
| Apr 22, 5:31 PM CDT | Flash Flood Warning | SHV | Bossier, Caddo, De Soto | 2 hr |
| Apr 22, 6:10 PM CDT | Flash Flood Warning | SHV | Bienville, Bossier, Claiborne, Jackson, Lincoln, Ouachita and 2 more | 3 hr |
| Apr 22, 6:28 PM CDT | Flash Flood Warning | SHV | Caldwell, Grant, Jackson, LaSalle, Natchitoches, Ouachita and 1 more | 94 min |
| Apr 22, 9:12 PM CDT | Flash Flood Warning | SHV | Bienville, De Soto, Jackson, Natchitoches, Red River, Sabine and 1 more | 109 min |
| Apr 22, 10:16 PM CDT | Flash Flood Warning | SHV | Bienville, Caldwell, De Soto, Jackson, Lincoln, Natchitoches and 5 more | 3 hr |
| Apr 23, 1:18 AM CDT | Flash Flood Warning | JAN | Franklin, Tensas | 3 hr |
| Apr 23, 1:32 AM CDT | Flash Flood Warning | JAN | Catahoula, Concordia | 3 hr |
| Apr 28, 6:30 PM CDT | Flash Flood Warning | LIX | Ascension, East Baton Rouge, Iberville, Livingston, West Baton Rouge | 3 hr |
| May 14, 5:40 PM CDT | Flash Flood Warning | LCH | Lafayette, Saint Martin | 2 hr |
| May 14, 7:08 PM CDT | Flash Flood Warning | LIX | Livingston, Saint Tammany, Tangipahoa | 6 hr |
| May 14, 8:27 PM CDT | Flash Flood Warning | LIX | Ascension, Assumption, Saint James, Saint John the Baptist | 3 hr |
| May 14, 10:23 PM CDT | Flash Flood Warning | LIX | Lafourche, Saint Charles, Saint John the Baptist | 5 hr |
| May 14, 11:53 PM CDT | Flash Flood Warning | LIX | Jefferson, Orleans | 3 hr |
| May 15, 2:27 AM CDT | Flash Flood Warning | LIX | Jefferson, Lafourche, Terrebonne | 3 hr |
| May 20, 10:13 AM CDT | Flash Flood Warning | SHV | Natchitoches, Sabine | 3 hr |
| May 20, 12:59 PM CDT | Flash Flood Warning | SHV | Natchitoches, Sabine | 7 hr |
| May 26, 8:27 PM CDT | Flash Flood Warning | SHV | Bossier, Caddo | 3 hr |
| Jun 8, 11:43 AM CDT | Flash Flood Warning | LIX | Jefferson, Orleans | 2 hr |
| Jun 10, 7:50 AM CDT | Flash Flood Warning | LIX | Jefferson, Orleans | 100 min |
| Jun 10, 9:22 AM CDT | Flash Flood Warning | LIX | Jefferson, Orleans | 83 min |
| Jun 24, 10:08 AM CDT | Flash Flood Warning | LIX | Lafourche, Terrebonne | 3 hr |
| Jun 24, 10:24 AM CDT | Flash Flood Warning | LIX | Jefferson, Orleans | 3 hr |
| Jun 24, 4:35 PM CDT | Flash Flood Warning | LIX | Assumption, Lafourche, Terrebonne | 3 hr |
| Jul 3, 12:49 PM CDT | Flash Flood Warning | LIX | Lafourche, Saint Charles | 116 min |
| Jul 3, 3:53 PM CDT | Flash Flood Warning | LCH | Calcasieu, Cameron | 3 hr |
| Jul 5, 1:44 PM CDT | Flash Flood Warning | LIX | Saint Charles | 3 hr |
| Jul 5, 3:31 PM CDT | Flash Flood Warning | LIX | Saint Tammany | 50 min |
| Jul 6, 10:00 AM CDT | Flash Flood Warning | LIX | Ascension | 2 hr |
| Jul 8, 7:45 AM CDT | Flash Flood Warning | JAN | East Carroll, Morehouse, West Carroll | 3 hr |
| Jul 27, 10:28 AM CDT | Flash Flood Warning | LIX | Saint Tammany, Washington | 2 hr |
| Jul 28, 2:26 PM CDT | Flash Flood Warning | LCH | Iberia, Vermilion | 2 hr |
| Aug 1, 2:52 AM CDT | Flash Flood Warning | LCH | Allen, Beauregard, Evangeline, Rapides, Vernon | 3 hr |
| Aug 1, 5:15 AM CDT | Flash Flood Warning | LCH | Avoyelles, Evangeline, Rapides | 3 hr |
| Aug 1, 5:25 AM CDT | Flash Flood Warning | LCH | Beauregard, Calcasieu | 3 hr |
| Aug 1, 6:27 AM CDT | Flash Flood Warning | LCH | Allen, Calcasieu, Jefferson Davis | 3 hr |
| Aug 12, 2:45 PM CDT | Flash Flood Warning | LIX | Jefferson, Orleans | 39 min |
| Aug 26, 11:38 PM CDT | Flash Flood Warning | LCH | Acadia, Allen, Evangeline, Iberia, Jefferson Davis, Lafayette and 4 more | 10 hr |
| Aug 27, 12:16 AM CDT | Flash Flood Warning | LCH | Calcasieu, Cameron, Jefferson Davis, Vermilion | 9 hr |
| Aug 27, 2:14 AM CDT | Flash Flood Warning | LCH | Allen, Beauregard, Calcasieu, Jefferson Davis, Rapides, Vernon | 8 hr |
| Aug 27, 4:00 AM CDT | Flash Flood Warning | LCH | Acadia, Allen, Avoyelles, Evangeline, Iberia, Lafayette and 3 more | 6 hr |
| Aug 27, 4:14 AM CDT | Flash Flood Warning | SHV | Grant, LaSalle, Natchitoches, Sabine, Winn | 8 hr |
| Aug 27, 7:43 AM CDT | Flash Flood Warning | SHV | Bienville, Bossier, Caddo, De Soto, Natchitoches, Red River and 1 more | 5 hr |
| Aug 27, 7:52 AM CDT | Flash Flood Warning | SHV | Bienville, Caldwell, Claiborne, Jackson, Lincoln, Ouachita and 1 more | 7 hr |
| Aug 27, 11:52 AM CDT | Flash Flood Warning | JAN | Morehouse | 2 hr |
| Aug 28, 10:58 AM CDT | Flash Flood Warning | LCH | Cameron | 3 hr |
| Aug 28, 6:38 PM CDT | Flash Flood Warning | LIX | Jefferson, Saint Charles | 112 min |
| Sep 10, 5:22 PM CDT | Flash Flood Warning | SHV | Bienville, Claiborne, Lincoln | 3 hr |
| Sep 23, 7:42 AM CDT | Flash Flood Warning | LCH | Beauregard, Calcasieu, Vernon | 7 hr |
| Sep 23, 8:15 AM CDT | Flash Flood Warning | LCH | Iberia, St. Mary | 4 hr |
| Sep 23, 10:14 AM CDT | Flash Flood Warning | JAN | Morehouse | 2 hr |
| Sep 23, 10:35 AM CDT | Flash Flood Warning | LCH | Allen, Beauregard, Vernon | 4 hr |
| Sep 23, 10:48 AM CDT | Flash Flood Warning | SHV | Ouachita, Union | 4 hr |
| Sep 23, 12:15 PM CDT | Flash Flood Warning | JAN | Morehouse | 3 hr |
| Sep 23, 12:25 PM CDT | Flash Flood Warning | LCH | Allen, Evangeline, Rapides, Vernon | 4 hr |
| Sep 23, 2:36 PM CDT | Flash Flood Warning | LCH | Allen, Beauregard, Vernon | 3 hr |
| Sep 23, 2:39 PM CDT | Flash Flood Warning | LCH | Avoyelles, Evangeline, Rapides | 96 min |
| Sep 23, 4:03 PM CDT | Flash Flood Warning | LCH | Allen, Avoyelles, Evangeline, Rapides, Vernon | 6 hr |
| Sep 23, 5:23 PM CDT | Flash Flood Warning | JAN | Catahoula, Concordia, Tensas | 3 hr |
| Oct 8, 10:57 PM CDT | Flash Flood Warning | LIX | Ascension, East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, West Baton Rouge | 2 hr |
| Oct 9, 12:36 AM CDT | Flash Flood Warning | LIX | Ascension, East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, West Baton Rouge and 1 more | 3 hr |
| Oct 9, 12:59 PM CDT | Flash Flood Warning | LCH | Acadia, Calcasieu, Cameron, Jefferson Davis, Vermilion | 6 hr |
| Oct 9, 2:19 PM CDT | Flash Flood Warning | LCH | Acadia, Iberia, Lafayette, Saint Martin, Vermilion | 5 hr |
| Oct 9, 3:48 PM CDT | Flash Flood Warning | LCH | Acadia, Allen, Evangeline, Jefferson Davis, Saint Landry | 5 hr |
| Oct 9, 4:47 PM CDT | Flash Flood Warning | LCH | Allen, Beauregard, Calcasieu, Jefferson Davis | 2 hr |
| Oct 9, 4:53 PM CDT | Flash Flood Warning | LCH | Acadia, Avoyelles, Evangeline, Lafayette, Rapides, Saint Landry | 3 hr |
| Oct 9, 6:56 PM CDT | Flash Flood Warning | LCH | Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 3 more | 6 hr |
| Oct 9, 7:02 PM CDT | Flash Flood Warning | LCH | Avoyelles, Rapides | 58 min |
| Oct 9, 8:04 PM CDT | Flash Flood Warning | LCH | Acadia, Allen, Avoyelles, Evangeline, Lafayette, Rapides and 2 more | 6 hr |
| Oct 9, 9:17 PM CDT | Flash Flood Warning | SHV | Caldwell, Grant, LaSalle, Natchitoches, Sabine, Winn | 6 hr |
| Oct 9, 9:23 PM CDT | Flash Flood Warning | JAN | Catahoula, Concordia | 6 hr |
| Oct 10, 2:56 AM CDT | Flash Flood Warning | SHV | Caldwell, Jackson, LaSalle, Lincoln, Ouachita, Union and 1 more | 6 hr |
| Oct 10, 3:05 AM CDT | Flash Flood Warning | SHV | Caldwell, Grant, LaSalle, Natchitoches, Winn | 6 hr |
| Oct 23, 3:40 PM CDT | Flash Flood Warning | LIX | Lafourche | 2 hr |
| Oct 23, 5:31 PM CDT | Flash Flood Warning | LCH | Iberia | 119 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Evangeline Parish14
- Allen Parish14
- Rapides Parish11
- Natchitoches Parish11
- De Soto Parish11
- Calcasieu Parish10
- Avoyelles Parish9
- Saint Landry Parish9
- Acadia Parish9
- Jefferson Davis Parish9
- Sabine Parish9
- Bossier Parish9
- Bienville Parish9
- Jackson Parish8
- Lincoln Parish8
- Jefferson Parish8
- Beauregard Parish8
- Vernon Parish8
- Caddo Parish7
- Union Parish7
- Ouachita Parish7
- Winn Parish7
- Morehouse Parish6
- Claiborne Parish6
- Caldwell Parish6
- Lafayette Parish6
- Lafourche Parish6
- Orleans Parish6
- Iberia Parish6
- Vermilion Parish6
- Catahoula Parish5
- Concordia Parish5
- Webster Parish5
- Red River Parish5
- LaSalle Parish5
- Ascension Parish5
- Cameron Parish5
- Grant Parish4
- Livingston Parish4
- Saint Martin Parish4
20 more counties
- Saint Charles Parish4
- East Carroll Parish3
- West Carroll Parish3
- Tensas Parish3
- East Baton Rouge Parish3
- West Baton Rouge Parish3
- Saint Tammany Parish3
- Terrebonne Parish3
- Richland Parish2
- Assumption Parish2
- Saint John the Baptist Parish2
- St. Mary Parish2
- East Feliciana Parish2
- Pointe Coupee Parish2
- Franklin Parish1
- Iberville Parish1
- Tangipahoa Parish1
- Saint James Parish1
- Washington Parish1
- West Feliciana Parish1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20192021
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.