Alert archive / Louisiana / Flash Flood Warnings
Flash Flood Warnings in Louisiana, 2015
92 flash flood warnings in 2015. 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 2015. Tap one for its archive.
- Flash Flood Warnings
- 92
- Busiest month
- May29 flash flood warnings
- Busiest day
- May 18, 201517 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.
55 of 92 flash flood warnings covering Louisiana in 2015 had a flash flood report inside them; 136 of 158 flash flood reports fell inside a warning, on average 68 minutes after it went out.
Louisiana, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 92 | 55 | 40% | 158 | 86% | 68 min |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Shreveport, LA: flash flood warnings | 115 | 80 | 30% | 274 | 89% | 96 min |
| NWS New Orleans, LA: flash flood warnings | 35 | 15 | 57% | 34 | 94% | 69 min |
| NWS Jackson, MS: flash flood warnings | 95 | 42 | 56% | 113 | 76% | 67 min |
| NWS Lake Charles, LA: flash flood warnings | 60 | 34 | 43% | 92 | 76% | 81 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 |
|---|---|---|---|---|
| Feb 21, 5:55 PM CST | Flash Flood Warning | JAN | East Carroll, Morehouse, Richland, West Carroll | 3 hr |
| Mar 12, 6:40 AM CDT | Flash Flood Warning | SHV | De Soto | 95 min |
| Mar 12, 8:52 AM CDT | Flash Flood Warning | SHV | Bossier, Caddo, De Soto, Red River, Webster | 4 hr |
| Mar 12, 2:29 PM CDT | Flash Flood Warning | SHV | Bossier, Caddo, De Soto | 4 hr |
| Mar 21, 12:32 PM CDT | Flash Flood Warning | LCH | Calcasieu | 88 min |
| Mar 21, 2:02 PM CDT | Flash Flood Warning | LCH | Calcasieu | 3 hr |
| Apr 11, 5:09 PM CDT | Flash Flood Warning | LIX | Lafourche, Terrebonne | 3 hr |
| Apr 13, 10:42 AM CDT | Flash Flood Warning | LIX | Plaquemines | 3 hr |
| Apr 14, 8:11 AM CDT | Flash Flood Warning | LIX | Livingston, Saint Tammany, Tangipahoa, Washington | 3 hr |
| Apr 14, 8:43 AM CDT | Flash Flood Warning | LIX | Ascension, Assumption, East Baton Rouge, Iberville, Lafourche, Livingston and 1 more | 3 hr |
| Apr 14, 9:11 AM CDT | Flash Flood Warning | LCH | Iberia, Lafayette, Saint Martin, St. Mary, Vermilion | 5 hr |
| Apr 14, 9:18 AM CDT | Flash Flood Warning | LIX | Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles, Saint John the Baptist and 1 more | 3 hr |
| Apr 14, 10:26 AM CDT | Flash Flood Warning | LIX | Assumption, Jefferson, Lafourche, Plaquemines, Saint Charles, Saint James and 2 more | 3 hr |
| Apr 14, 11:15 AM CDT | Flash Flood Warning | LIX | Livingston, Saint Tammany, Tangipahoa, Washington | 3 hr |
| Apr 14, 11:50 AM CDT | Flash Flood Warning | LIX | Ascension, Assumption, Iberville, Livingston, Saint James | 3 hr |
| Apr 14, 12:14 PM CDT | Flash Flood Warning | LIX | Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles, Saint John the Baptist | 3 hr |
| Apr 15, 3:16 PM CDT | Flash Flood Warning | LIX | Ascension, Livingston, Saint James, Saint John the Baptist | 3 hr |
| Apr 16, 2:29 PM CDT | Flash Flood Warning | LCH | Rapides | 3 hr |
| Apr 16, 4:09 PM CDT | Flash Flood Warning | LCH | Avoyelles, Rapides, Saint Landry, Vernon | 3 hr |
| Apr 27, 6:36 AM CDT | Flash Flood Warning | SHV | Sabine | 3 hr |
| May 18, 3:21 AM CDT | Flash Flood Warning | SHV | Bossier, Caddo, De Soto, Webster | 2 hr |
| May 18, 4:20 AM CDT | Flash Flood Warning | JAN | Madison, Tensas | 3 hr |
| May 18, 4:42 AM CDT | Flash Flood Warning | JAN | Richland | 3 hr |
| May 18, 5:42 AM CDT | Flash Flood Warning | SHV | Caddo | 93 min |
| May 18, 6:02 AM CDT | Flash Flood Warning | SHV | Bienville, Caldwell, Jackson, Lincoln, Ouachita | 3 hr |
| May 18, 6:35 AM CDT | Flash Flood Warning | JAN | Franklin, Madison, Richland | 4 hr |
| May 18, 7:05 AM CDT | Flash Flood Warning | JAN | Madison, Tensas | 6 hr |
| May 18, 7:13 AM CDT | Flash Flood Warning | SHV | Bienville, Caldwell, Jackson, Natchitoches, Red River, Winn | 3 hr |
| May 18, 7:45 AM CDT | Flash Flood Warning | JAN | Catahoula, Franklin, Tensas | 3 hr |
| May 18, 8:59 AM CDT | Flash Flood Warning | SHV | Bienville, Caldwell, Jackson, Lincoln, Ouachita | 2 hr |
| May 18, 9:16 AM CDT | Flash Flood Warning | SHV | De Soto, Grant, LaSalle, Natchitoches, Sabine, Winn | 4 hr |
| May 18, 10:28 AM CDT | Flash Flood Warning | SHV | Bienville, Bossier, Caddo, De Soto, Jackson, Natchitoches and 4 more | 4 hr |
| May 18, 10:37 AM CDT | Flash Flood Warning | SHV | Caldwell, Jackson, LaSalle, Winn | 3 hr |
| May 18, 1:14 PM CDT | Flash Flood Warning | SHV | De Soto, Grant, LaSalle, Natchitoches, Sabine, Winn | 2 hr |
| May 18, 1:29 PM CDT | Flash Flood Warning | SHV | Caldwell, Jackson, LaSalle, Winn | 3 hr |
| May 18, 1:57 PM CDT | Flash Flood Warning | LIX | Ascension, Iberville, Livingston | 3 hr |
| May 18, 3:04 PM CDT | Flash Flood Warning | LIX | Saint Tammany, Washington | 3 hr |
| May 21, 1:35 PM CDT | Flash Flood Warning | LCH | Calcasieu, Cameron, Jefferson Davis | 3 hr |
| May 21, 3:06 PM CDT | Flash Flood Warning | LIX | Livingston | 3 hr |
| May 25, 1:32 AM CDT | Flash Flood Warning | LIX | Jefferson, Orleans | 3 hr |
| May 25, 8:14 PM CDT | Flash Flood Warning | SHV | Bossier, Caddo, De Soto | 4 hr |
| May 25, 9:47 PM CDT | Flash Flood Warning | LCH | Beauregard, Calcasieu, Vernon | 3 hr |
| May 25, 10:31 PM CDT | Flash Flood Warning | LCH | Calcasieu | 4 hr |
| May 26, 12:22 AM CDT | Flash Flood Warning | JAN | Concordia | 3 hr |
| May 26, 2:31 AM CDT | Flash Flood Warning | LCH | Calcasieu, Cameron | 3 hr |
| May 26, 9:16 PM CDT | Flash Flood Warning | SHV | Union | 3 hr |
| May 28, 6:11 PM CDT | Flash Flood Warning | SHV | Grant, Natchitoches, Red River, Winn | 3 hr |
| May 30, 11:02 AM CDT | Flash Flood Warning | SHV | Bossier, Caddo | 118 min |
| May 31, 3:32 PM CDT | Flash Flood Warning | LIX | Jefferson, Orleans, Saint Bernard | 88 min |
| Jun 9, 8:34 AM CDT | Flash Flood Warning | LIX | Saint Tammany, Tangipahoa, Washington | 3 hr |
| Jun 9, 11:36 AM CDT | Flash Flood Warning | LIX | East Baton Rouge, Livingston, Saint Helena | 114 min |
| Jun 9, 1:15 PM CDT | Flash Flood Warning | LIX | East Baton Rouge, Iberville, West Baton Rouge | 3 hr |
| Jun 17, 5:22 PM CDT | Flash Flood Warning | LCH | Beauregard, Vernon | 5 hr |
| Jun 17, 8:41 PM CDT | Flash Flood Warning | LCH | Beauregard, Vernon | 94 min |
| Jun 17, 10:10 PM CDT | Flash Flood Warning | LCH | Beauregard, Vernon | 3 hr |
| Jun 18, 12:39 AM CDT | Flash Flood Warning | SHV | Grant, Natchitoches, Sabine, Winn | 6 hr |
| Jun 18, 1:09 AM CDT | Flash Flood Warning | LCH | Vernon | 3 hr |
| Jun 18, 6:34 AM CDT | Flash Flood Warning | SHV | Bossier, Caddo, De Soto, Webster | 6 hr |
| Jun 23, 4:48 PM CDT | Flash Flood Warning | LIX | East Baton Rouge | 3 hr |
| Jun 24, 6:57 PM CDT | Flash Flood Warning | LIX | East Baton Rouge, West Baton Rouge | 3 hr |
| Jun 29, 7:28 PM CDT | Flash Flood Warning | JAN | Tensas | 3 hr |
| Jun 30, 6:28 PM CDT | Flash Flood Warning | SHV | Bossier | 3 hr |
| Jun 30, 7:50 PM CDT | Flash Flood Warning | JAN | Morehouse, Richland | 3 hr |
| Jul 4, 9:28 AM CDT | Flash Flood Warning | SHV | Claiborne, Lincoln, Union | 5 hr |
| Jul 5, 8:14 AM CDT | Flash Flood Warning | JAN | East Carroll, Morehouse, West Carroll | 3 hr |
| Jul 5, 12:15 PM CDT | Flash Flood Warning | JAN | East Carroll, Morehouse, West Carroll | 4 hr |
| Jul 5, 5:34 PM CDT | Flash Flood Warning | JAN | Catahoula, Concordia | 3 hr |
| Aug 19, 4:56 PM CDT | Flash Flood Warning | SHV | Bossier, Caddo | 3 hr |
| Sep 2, 10:21 AM CDT | Flash Flood Warning | LIX | Lafourche | 3 hr |
| Sep 10, 2:08 PM CDT | Flash Flood Warning | LCH | Calcasieu, Jefferson Davis | 112 min |
| Sep 27, 1:09 PM CDT | Flash Flood Warning | LIX | Plaquemines, Saint Bernard | 111 min |
| Oct 25, 4:43 PM CDT | Flash Flood Warning | LCH | Beauregard, Rapides, Vernon | 3 hr |
| Oct 25, 7:45 PM CDT | Flash Flood Warning | LCH | Beauregard, Vernon | 3 hr |
| Oct 31, 7:00 AM CDT | Flash Flood Warning | LCH | Beauregard | 6 hr |
| Oct 31, 7:24 AM CDT | Flash Flood Warning | LCH | Vernon | 5 hr |
| Oct 31, 8:12 AM CDT | Flash Flood Warning | LCH | Beauregard, Vernon | 5 hr |
| Oct 31, 9:29 AM CDT | Flash Flood Warning | LCH | Rapides, Vernon | 3 hr |
| Oct 31, 11:00 AM CDT | Flash Flood Warning | LCH | Rapides | 90 min |
| Oct 31, 11:02 AM CDT | Flash Flood Warning | LCH | Beauregard, Calcasieu | 88 min |
| Oct 31, 12:42 PM CDT | Flash Flood Warning | LCH | Beauregard, Calcasieu, Cameron, Rapides, Vernon | 6 hr |
| Nov 6, 8:41 PM CST | Flash Flood Warning | LCH | Iberia, Saint Landry, Saint Martin | 5 hr |
| Nov 17, 4:59 PM CST | Flash Flood Warning | JAN | Morehouse, Richland, West Carroll | 3 hr |
| Nov 17, 9:18 PM CST | Flash Flood Warning | JAN | East Carroll, Madison | 6 hr |
| Nov 17, 9:38 PM CST | Flash Flood Warning | JAN | Concordia, Franklin, Tensas | 4 hr |
| Dec 25, 12:44 PM CST | Flash Flood Warning | JAN | Concordia | 3 hr |
| Dec 25, 9:32 PM CST | Flash Flood Warning | JAN | Tensas | 3 hr |
| Dec 25, 11:22 PM CST | Flash Flood Warning | JAN | Morehouse, Richland, West Carroll | 113 min |
| Dec 26, 12:32 AM CST | Flash Flood Warning | JAN | West Carroll | 3 hr |
| Dec 27, 9:05 PM CST | Flash Flood Warning | SHV | Bossier, Caddo, De Soto | 3 hr |
| Dec 27, 9:56 PM CST | Flash Flood Warning | SHV | Bienville, Claiborne, Red River, Webster | 6 hr |
| Dec 27, 10:04 PM CST | Flash Flood Warning | SHV | Natchitoches, Sabine | 6 hr |
| Dec 28, 12:23 AM CST | Flash Flood Warning | SHV | Grant, Jackson, Lincoln, Winn | 4 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Vernon Parish12
- De Soto Parish10
- Bossier Parish10
- Caddo Parish10
- Beauregard Parish10
- Calcasieu Parish9
- Winn Parish9
- Livingston Parish8
- Jackson Parish7
- Natchitoches Parish7
- Morehouse Parish6
- Richland Parish6
- West Carroll Parish6
- Rapides Parish6
- Sabine Parish6
- Tensas Parish6
- Red River Parish5
- Webster Parish5
- Plaquemines Parish5
- East Baton Rouge Parish5
- Jefferson Parish5
- Bienville Parish5
- Caldwell Parish5
- Grant Parish5
- East Carroll Parish4
- Lafourche Parish4
- Saint Tammany Parish4
- Tangipahoa Parish4
- Washington Parish4
- Ascension Parish4
- Iberville Parish4
- Saint James Parish4
- Orleans Parish4
- Saint Bernard Parish4
- Saint John the Baptist Parish4
- Madison Parish4
- Lincoln Parish4
- LaSalle Parish4
- Concordia Parish4
- Assumption Parish3
18 more counties
- Saint Charles Parish3
- Franklin Parish3
- Cameron Parish3
- Terrebonne Parish2
- Iberia Parish2
- Saint Martin Parish2
- Saint Landry Parish2
- Ouachita Parish2
- Catahoula Parish2
- Jefferson Davis Parish2
- Union Parish2
- West Baton Rouge Parish2
- Claiborne Parish2
- Lafayette Parish1
- St. Mary Parish1
- Vermilion Parish1
- Avoyelles Parish1
- Saint Helena Parish1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20142016
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.