Alert archive / Louisiana / Flash Flood Warnings
Flash Flood Warnings in Louisiana, 2017
115 flash flood warnings in 2017. 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 2017. Tap one for its archive.
- Flash Flood Warnings
- 115
- Busiest month
- August40 flash flood warnings
- Busiest day
- May 3, 201713 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.
60 of 115 flash flood warnings covering Louisiana in 2017 had a flash flood report inside them; 135 of 158 flash flood reports fell inside a warning, on average 168 minutes after it went out.
Louisiana, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 115 | 60 | 48% | 158 | 85% | 168 min |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS New Orleans, LA: flash flood warnings | 45 | 15 | 67% | 32 | 75% | 68 min |
| NWS Shreveport, LA: flash flood warnings | 45 | 30 | 33% | 129 | 84% | 248 min |
| NWS Jackson, MS: flash flood warnings | 128 | 78 | 39% | 257 | 79% | 68 min |
| NWS Lake Charles, LA: flash flood warnings | 89 | 50 | 44% | 129 | 88% | 252 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, 11:59 AM CST | Flash Flood Warning | LCH | Acadia, Avoyelles, Evangeline, Jefferson Davis, Rapides, Saint Landry | 4 hr |
| Jan 19, 7:27 AM CST | Flash Flood Warning | LIX | East Baton Rouge, West Baton Rouge | 3 hr |
| Jan 19, 9:15 AM CST | Flash Flood Warning | LIX | Livingston, Saint Helena, Tangipahoa, Washington | 3 hr |
| Jan 19, 10:34 AM CST | Flash Flood Warning | LIX | East Baton Rouge | 4 hr |
| Mar 29, 7:53 PM CDT | Flash Flood Warning | LCH | Calcasieu, Cameron, Jefferson Davis | 6 hr |
| Mar 29, 10:30 PM CDT | Flash Flood Warning | LCH | Acadia, Allen, Evangeline, Jefferson Davis, Saint Landry | 6 hr |
| Mar 30, 1:42 AM CDT | Flash Flood Warning | LCH | Saint Landry | 5 hr |
| Apr 2, 4:37 PM CDT | Flash Flood Warning | LCH | Vernon | 6 hr |
| Apr 2, 5:13 PM CDT | Flash Flood Warning | SHV | Caldwell, Grant, LaSalle, Natchitoches, Sabine, Winn | 10 hr |
| Apr 2, 5:28 PM CDT | Flash Flood Warning | LCH | Rapides | 6 hr |
| Apr 2, 6:40 PM CDT | Flash Flood Warning | JAN | Catahoula, Franklin, Madison, Richland, Tensas | 4 hr |
| Apr 2, 6:42 PM CDT | Flash Flood Warning | LCH | Allen, Beauregard, Rapides, Vernon | 6 hr |
| Apr 2, 9:49 PM CDT | Flash Flood Warning | LCH | Rapides, Vernon | 3 hr |
| Apr 2, 10:04 PM CDT | Flash Flood Warning | LCH | Allen, Avoyelles, Beauregard, Evangeline, Rapides | 2 hr |
| Apr 2, 10:12 PM CDT | Flash Flood Warning | JAN | Catahoula, Concordia, Tensas | 4 hr |
| Apr 2, 10:43 PM CDT | Flash Flood Warning | JAN | Catahoula, Franklin, Madison, Tensas | 4 hr |
| Apr 2, 11:26 PM CDT | Flash Flood Warning | JAN | Concordia | 4 hr |
| Apr 3, 12:38 AM CDT | Flash Flood Warning | LCH | Allen, Avoyelles, Beauregard, Evangeline, Rapides, Vernon | 6 hr |
| Apr 3, 12:39 AM CDT | Flash Flood Warning | LCH | Acadia, Evangeline, Saint Landry | 6 hr |
| Apr 3, 2:31 AM CDT | Flash Flood Warning | LIX | Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena and 2 more | 3 hr |
| Apr 3, 4:49 AM CDT | Flash Flood Warning | LIX | Saint Tammany, Tangipahoa | 3 hr |
| Apr 11, 2:33 PM CDT | Flash Flood Warning | LCH | Jefferson Davis | 3 hr |
| Apr 18, 2:15 PM CDT | Flash Flood Warning | LCH | Calcasieu | 3 hr |
| Apr 30, 3:13 AM CDT | Flash Flood Warning | LCH | Acadia, Allen, Avoyelles, Calcasieu, Evangeline, Jefferson Davis and 1 more | 5 hr |
| Apr 30, 6:10 AM CDT | Flash Flood Warning | JAN | Concordia | 4 hr |
| Apr 30, 6:10 AM CDT | Flash Flood Warning | LCH | Avoyelles, Rapides | 4 hr |
| May 3, 9:23 AM CDT | Flash Flood Warning | LCH | Acadia, Calcasieu, Jefferson Davis, Vermilion | 112 min |
| May 3, 10:03 AM CDT | Flash Flood Warning | LCH | Beauregard, Calcasieu | 87 min |
| May 3, 11:16 AM CDT | Flash Flood Warning | LCH | Calcasieu, Jefferson Davis | 6 hr |
| May 3, 11:21 AM CDT | Flash Flood Warning | LCH | Acadia, Iberia, Lafayette, Saint Martin, Vermilion | 6 hr |
| May 3, 1:00 PM CDT | Flash Flood Warning | LCH | Beauregard, Calcasieu | 5 hr |
| May 3, 1:47 PM CDT | Flash Flood Warning | LCH | Iberia, Saint Martin, St. Mary | 3 hr |
| May 3, 1:59 PM CDT | Flash Flood Warning | LIX | Saint James, Saint John the Baptist | 3 hr |
| May 3, 2:35 PM CDT | Flash Flood Warning | LCH | Acadia, Allen, Beauregard, Evangeline, Jefferson Davis, Lafayette and 1 more | 3 hr |
| May 3, 4:08 PM CDT | Flash Flood Warning | LCH | Allen, Beauregard, Rapides, Vernon | 6 hr |
| May 3, 5:15 PM CDT | Flash Flood Warning | LCH | Allen, Beauregard, Calcasieu, Jefferson Davis | 6 hr |
| May 3, 5:22 PM CDT | Flash Flood Warning | LCH | Acadia, Evangeline, Iberia, Lafayette, Saint Landry, Saint Martin and 2 more | 6 hr |
| May 3, 6:24 PM CDT | Flash Flood Warning | LCH | Avoyelles, Evangeline, Rapides, Saint Landry | 3 hr |
| May 3, 6:24 PM CDT | Flash Flood Warning | SHV | Sabine | 3 hr |
| May 20, 3:15 PM CDT | Flash Flood Warning | LIX | East Feliciana, Pointe Coupee, West Feliciana | 90 min |
| May 20, 6:15 PM CDT | Flash Flood Warning | LIX | Saint Tammany, Washington | 2 hr |
| May 28, 6:32 PM CDT | Flash Flood Warning | SHV | Bienville, Bossier, Caddo, De Soto, Red River, Webster | 3 hr |
| May 28, 7:02 PM CDT | Flash Flood Warning | SHV | De Soto, Red River, Sabine | 3 hr |
| May 28, 8:00 PM CDT | Flash Flood Warning | SHV | Bienville, Bossier, Claiborne, De Soto, Jackson, Lincoln and 6 more | 3 hr |
| May 30, 8:38 AM CDT | Flash Flood Warning | LCH | Iberia, St. Mary | 2 hr |
| May 30, 10:37 AM CDT | Flash Flood Warning | LCH | Iberia, St. Mary | 3 hr |
| May 30, 1:31 PM CDT | Flash Flood Warning | LCH | Iberia, Saint Martin, St. Mary | 3 hr |
| Jun 3, 8:38 PM CDT | Flash Flood Warning | SHV | Claiborne, Union | 4 hr |
| Jun 12, 6:14 PM CDT | Flash Flood Warning | JAN | Morehouse | 3 hr |
| Jun 23, 4:59 AM CDT | Flash Flood Warning | SHV | De Soto, Natchitoches, Red River | 3 hr |
| Jun 23, 8:40 AM CDT | Flash Flood Warning | JAN | East Carroll, Morehouse, West Carroll | 3 hr |
| Jun 23, 10:23 AM CDT | Flash Flood Warning | SHV | Claiborne, Lincoln, Ouachita, Union | 3 hr |
| Jun 23, 9:36 PM CDT | Flash Flood Warning | JAN | Richland | 114 min |
| Jun 24, 12:34 AM CDT | Flash Flood Warning | SHV | Caddo | 3 hr |
| Jun 24, 2:05 PM CDT | Flash Flood Warning | LIX | Jefferson, Saint Charles | 85 min |
| Jun 24, 3:19 PM CDT | Flash Flood Warning | LIX | Ascension, Livingston, Tangipahoa | 3 hr |
| Jun 26, 3:37 PM CDT | Flash Flood Warning | LCH | Calcasieu | 3 hr |
| Jun 29, 5:40 AM CDT | Flash Flood Warning | LCH | Calcasieu | 3 hr |
| Jun 29, 7:06 AM CDT | Flash Flood Warning | LCH | Calcasieu | 5 hr |
| Jun 29, 12:30 PM CDT | Flash Flood Warning | LCH | Acadia, Lafayette, Saint Landry, Saint Martin | 4 hr |
| Jul 1, 4:41 PM CDT | Flash Flood Warning | SHV | Claiborne, Lincoln, Union | 3 hr |
| Jul 1, 5:02 PM CDT | Flash Flood Warning | SHV | Ouachita, Union | 3 hr |
| Jul 1, 5:31 PM CDT | Flash Flood Warning | JAN | Morehouse, Richland | 3 hr |
| Jul 8, 8:32 AM CDT | Flash Flood Warning | LIX | East Feliciana | 3 hr |
| Jul 9, 3:45 PM CDT | Flash Flood Warning | LIX | Pointe Coupee, West Feliciana | 3 hr |
| Jul 9, 4:51 PM CDT | Flash Flood Warning | LIX | Livingston | 3 hr |
| Jul 25, 6:24 PM CDT | Flash Flood Warning | JAN | Morehouse, West Carroll | 3 hr |
| Aug 5, 4:02 PM CDT | Flash Flood Warning | LIX | Orleans | 4 hr |
| Aug 5, 4:55 PM CDT | Flash Flood Warning | LIX | Jefferson, Orleans | 3 hr |
| Aug 5, 7:58 PM CDT | Flash Flood Warning | LIX | Orleans | 6 hr |
| Aug 7, 6:29 PM CDT | Flash Flood Warning | LCH | Iberia, Saint Martin | 2 hr |
| Aug 8, 10:10 AM CDT | Flash Flood Warning | JAN | West Carroll | 3 hr |
| Aug 8, 5:59 PM CDT | Flash Flood Warning | LIX | Saint Charles | 2 hr |
| Aug 8, 7:48 PM CDT | Flash Flood Warning | LIX | Orleans | 87 min |
| Aug 10, 3:04 AM CDT | Flash Flood Warning | SHV | Grant, Jackson, Winn | 3 hr |
| Aug 10, 5:59 AM CDT | Flash Flood Warning | SHV | Jackson, Winn | 3 hr |
| Aug 10, 8:59 AM CDT | Flash Flood Warning | SHV | Winn | 3 hr |
| Aug 10, 1:48 PM CDT | Flash Flood Warning | LIX | Tangipahoa | 117 min |
| Aug 11, 5:48 PM CDT | Flash Flood Warning | JAN | Madison | 3 hr |
| Aug 26, 2:00 PM CDT | Flash Flood Warning | LCH | Beauregard, Calcasieu | 4 hr |
| Aug 27, 9:55 AM CDT | Flash Flood Warning | LCH | Calcasieu, Cameron | 5 hr |
| Aug 27, 11:52 AM CDT | Flash Flood Warning | LCH | Calcasieu, Jefferson Davis | 4 hr |
| Aug 27, 2:40 PM CDT | Flash Flood Warning | LCH | Allen, Beauregard, Calcasieu, Cameron, Jefferson Davis | 5 hr |
| Aug 27, 11:58 PM CDT | Flash Flood Warning | LCH | Beauregard, Calcasieu, Cameron, Jefferson Davis | 8 hr |
| Aug 28, 7:34 AM CDT | Flash Flood Warning | LCH | Acadia | 5 hr |
| Aug 28, 7:54 AM CDT | Flash Flood Warning | LCH | Beauregard, Calcasieu, Cameron, Jefferson Davis | 11 hr |
| Aug 28, 8:14 AM CDT | Flash Flood Warning | LCH | Allen, Beauregard, Jefferson Davis, Vernon | 11 hr |
| Aug 28, 9:28 AM CDT | Flash Flood Warning | LCH | Allen, Avoyelles, Evangeline, Rapides, Saint Landry, Vernon | 6 hr |
| Aug 28, 9:37 AM CDT | Flash Flood Warning | LCH | Acadia, Iberia, Lafayette, Saint Landry, Saint Martin, St. Mary and 1 more | 13 hr |
| Aug 28, 6:41 PM CDT | Flash Flood Warning | LCH | Calcasieu, Cameron, Jefferson Davis | 7 hr |
| Aug 29, 2:02 AM CDT | Flash Flood Warning | LCH | Calcasieu, Cameron, Jefferson Davis | 9 hr |
| Aug 29, 8:27 AM CDT | Flash Flood Warning | LIX | Jefferson, Lafourche, Saint Charles, Saint John the Baptist | 2 hr |
| Aug 29, 8:32 AM CDT | Flash Flood Warning | LIX | Jefferson, Orleans, Plaquemines, Saint Bernard | 118 min |
| Aug 29, 11:30 AM CDT | Flash Flood Warning | LIX | Assumption, Lafourche, Saint Charles, Saint James, Saint John the Baptist, Terrebonne | 2 hr |
| Aug 29, 1:05 PM CDT | Flash Flood Warning | LCH | Calcasieu, Cameron | 6 hr |
| Aug 29, 2:53 PM CDT | Flash Flood Warning | LIX | Ascension, Saint James | 97 min |
| Aug 29, 7:09 PM CDT | Flash Flood Warning | LCH | Calcasieu, Cameron | 3 hr |
| Aug 29, 7:24 PM CDT | Flash Flood Warning | LCH | Beauregard, Vernon | 6 hr |
| Aug 29, 10:22 PM CDT | Flash Flood Warning | LCH | Beauregard, Vernon | 11 hr |
| Aug 30, 12:56 AM CDT | Flash Flood Warning | LIX | Saint Charles | 2 hr |
| Aug 30, 4:18 AM CDT | Flash Flood Warning | LCH | Calcasieu, Cameron | 5 hr |
| Aug 30, 8:20 AM CDT | Flash Flood Warning | LCH | Beauregard, Calcasieu, Vernon | 12 hr |
| Aug 30, 10:34 AM CDT | Flash Flood Warning | SHV | Sabine | 9 hr |
| Aug 30, 11:36 AM CDT | Flash Flood Warning | SHV | De Soto, Natchitoches, Red River | 8 hr |
| Aug 30, 2:25 PM CDT | Flash Flood Warning | SHV | Bienville, Caldwell, Grant, Jackson, LaSalle, Winn | 6 hr |
| Aug 30, 7:59 PM CDT | Flash Flood Warning | SHV | De Soto, Natchitoches, Red River, Sabine, Winn | 12 hr |
| Aug 30, 8:57 PM CDT | Flash Flood Warning | LCH | Beauregard, Vernon | 13 hr |
| Oct 2, 12:09 PM CDT | Flash Flood Warning | LIX | Jefferson, Orleans, Saint Bernard | 4 hr |
| Oct 22, 1:26 AM CDT | Flash Flood Warning | LIX | East Feliciana, West Feliciana | 3 hr |
| Oct 22, 1:38 AM CDT | Flash Flood Warning | LCH | Iberia, Saint Martin, St. Mary | 112 min |
| Oct 22, 3:30 AM CDT | Flash Flood Warning | LCH | Iberia, Saint Martin, St. Mary | 2 hr |
| Oct 22, 4:00 AM CDT | Flash Flood Warning | LIX | East Feliciana | 3 hr |
| Oct 22, 5:20 AM CDT | Flash Flood Warning | LIX | East Feliciana, Saint Helena | 115 min |
| Oct 22, 5:32 AM CDT | Flash Flood Warning | LCH | Iberia, Saint Martin, St. Mary | 118 min |
| Nov 1, 2:32 PM CDT | Flash Flood Warning | LCH | Lafayette, Vermilion | 118 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Calcasieu Parish23
- Beauregard Parish17
- Jefferson Davis Parish16
- Acadia Parish11
- Saint Landry Parish11
- Allen Parish11
- Vernon Parish11
- Iberia Parish11
- Evangeline Parish10
- Rapides Parish10
- Cameron Parish10
- Saint Martin Parish10
- St. Mary Parish9
- Avoyelles Parish7
- Winn Parish7
- Sabine Parish6
- East Feliciana Parish6
- Lafayette Parish6
- De Soto Parish6
- Red River Parish6
- Orleans Parish6
- Tangipahoa Parish5
- Natchitoches Parish5
- Vermilion Parish5
- Union Parish5
- Jefferson Parish5
- Saint Charles Parish5
- Livingston Parish4
- Claiborne Parish4
- Jackson Parish4
- Morehouse Parish4
- East Baton Rouge Parish3
- Saint Helena Parish3
- Grant Parish3
- Catahoula Parish3
- Madison Parish3
- Richland Parish3
- Tensas Parish3
- Concordia Parish3
- Ascension Parish3
24 more counties
- Saint James Parish3
- Saint John the Baptist Parish3
- West Feliciana Parish3
- Bienville Parish3
- Lincoln Parish3
- West Carroll Parish3
- West Baton Rouge Parish2
- Washington Parish2
- Caldwell Parish2
- LaSalle Parish2
- Franklin Parish2
- Saint Tammany Parish2
- Pointe Coupee Parish2
- Bossier Parish2
- Caddo Parish2
- Webster Parish2
- Ouachita Parish2
- Lafourche Parish2
- Saint Bernard Parish2
- Iberville Parish1
- East Carroll Parish1
- Plaquemines Parish1
- Assumption Parish1
- Terrebonne Parish1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20162018
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.