Alert archive / Louisiana / Flash Flood Warnings

Flash Flood Warnings in Louisiana, 2018

85 flash flood warnings in 2018. 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 2018. Tap one for its archive.

Flash Flood Warnings
85
Busiest month
February28 flash flood warnings
Busiest day
February 21, 201816 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.

54 of 85 flash flood warnings covering Louisiana in 2018 had a flash flood report inside them; 105 of 122 flash flood reports fell inside a warning, on average 93 minutes after it went out.

Louisiana, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Flash flood warnings855436%12286%93 min

Each office's whole area, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Jackson, MS: flash flood warnings1217439%24585%93 min
NWS New Orleans, LA: flash flood warnings191332%2685%130 min
NWS Shreveport, LA: flash flood warnings453816%12578%103 min
NWS Lake Charles, LA: flash flood warnings562261%5182%87 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.

IssuedProductOfficeCountiesLasted
Jan 27, 7:05 AM CSTFlash Flood WarningLCHCalcasieu, Cameron115 min
Jan 27, 8:00 AM CSTFlash Flood WarningLCHIberia, Lafayette, Saint Martin, Vermilion2 hr
Jan 27, 8:29 AM CSTFlash Flood WarningLCHCalcasieu, Cameron, Jefferson Davis3 hr
Jan 27, 10:06 AM CSTFlash Flood WarningLIXAssumption, East Baton Rouge, Iberville3 hr
Feb 21, 8:54 AM CSTFlash Flood WarningSHVBossier, Caddo, De Soto2 hr
Feb 21, 9:46 AM CSTFlash Flood WarningLCHBeauregard, Vernon5 hr
Feb 21, 10:29 AM CSTFlash Flood WarningSHVGrant, Natchitoches, Winn3 hr
Feb 21, 10:43 AM CSTFlash Flood WarningSHVGrant, Natchitoches, Winn3 hr
Feb 21, 10:52 AM CSTFlash Flood WarningLCHVernon4 hr
Feb 21, 11:19 AM CSTFlash Flood WarningLCHRapides3 hr
Feb 21, 11:24 AM CSTFlash Flood WarningSHVBienville, Bossier, Caddo, De Soto, Red River, Webster3 hr
Feb 21, 11:31 AM CSTFlash Flood WarningSHVBossier, Caddo, Webster3 hr
Feb 21, 12:23 PM CSTFlash Flood WarningSHVGrant, LaSalle3 hr
Feb 21, 12:36 PM CSTFlash Flood WarningSHVDe Soto, Natchitoches, Red River, Sabine3 hr
Feb 21, 1:52 PM CSTFlash Flood WarningJANCatahoula, Franklin, Tensas3 hr
Feb 21, 2:38 PM CSTFlash Flood WarningSHVClaiborne, Webster16 hr
Feb 21, 2:46 PM CSTFlash Flood WarningLCHRapides, Vernon5 hr
Feb 21, 3:02 PM CSTFlash Flood WarningSHVBienville, Grant, Jackson, Natchitoches, Winn11 hr
Feb 21, 3:30 PM CSTFlash Flood WarningSHVSabine17 hr
Feb 21, 3:35 PM CSTFlash Flood WarningSHVBossier, Caddo, De Soto, Red River7 hr
Feb 21, 8:14 PM CSTFlash Flood WarningJANMorehouse6 hr
Feb 21, 8:48 PM CSTFlash Flood WarningSHVLincoln, Ouachita, Union10 hr
Feb 22, 1:47 AM CSTFlash Flood WarningSHVBienville, Grant, Jackson, Natchitoches, Winn5 hr
Feb 22, 4:34 AM CSTFlash Flood WarningJANMorehouse6 hr
Feb 22, 6:45 AM CSTFlash Flood WarningSHVBienville, Grant, Jackson, Natchitoches, Winn3 hr
Feb 22, 6:46 AM CSTFlash Flood WarningSHVLincoln, Ouachita, Union6 hr
Feb 22, 7:32 AM CSTFlash Flood WarningJANEast Carroll, Franklin, Madison, Richland, West Carroll4 hr
Feb 22, 10:46 PM CSTFlash Flood WarningSHVDe Soto89 min
Feb 25, 12:21 PM CSTFlash Flood WarningLCHAllen, Avoyelles, Beauregard, Evangeline, Rapides, Vernon4 hr
Feb 25, 4:43 PM CSTFlash Flood WarningLCHVernon4 hr
Feb 25, 6:42 PM CSTFlash Flood WarningJANCatahoula, Concordia, Franklin, Tensas3 hr
Feb 25, 7:00 PM CSTFlash Flood WarningLCHAvoyelles, Rapides3 hr
Mar 28, 10:35 PM CDTFlash Flood WarningLCHBeauregard, Calcasieu3 hr
Mar 28, 11:03 PM CDTFlash Flood WarningSHVBienville, Caldwell, Jackson, Lincoln, Ouachita, Union6 hr
Mar 28, 11:11 PM CDTFlash Flood WarningSHVCaldwell, Grant, LaSalle, Winn6 hr
Mar 28, 11:14 PM CDTFlash Flood WarningSHVDe Soto, Natchitoches, Red River, Sabine6 hr
Mar 29, 1:02 AM CDTFlash Flood WarningLCHAllen, Avoyelles, Beauregard, Rapides, Vernon4 hr
Mar 29, 4:55 AM CDTFlash Flood WarningLCHAllen, Avoyelles, Beauregard, Calcasieu, Evangeline, Rapides and 1 more3 hr
Apr 6, 7:18 PM CDTFlash Flood WarningJANFranklin, Madison, Richland3 hr
Apr 6, 10:28 PM CDTFlash Flood WarningJANFranklin, Madison, Richland, Tensas3 hr
Apr 13, 10:18 PM CDTFlash Flood WarningJANMorehouse, West Carroll3 hr
Apr 14, 12:11 PM CDTFlash Flood WarningLIXSaint Tammany3 hr
Apr 14, 12:13 PM CDTFlash Flood WarningLIXJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 1 more3 hr
May 18, 5:02 PM CDTFlash Flood WarningLIXJefferson, Orleans58 min
May 26, 5:30 PM CDTFlash Flood WarningJANTensas60 min
May 26, 5:35 PM CDTFlash Flood WarningJANMorehouse55 min
Jun 5, 2:41 PM CDTFlash Flood WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles75 min
Jun 12, 5:50 PM CDTFlash Flood WarningLIXEast Baton Rouge, West Baton Rouge85 min
Jun 12, 7:20 PM CDTFlash Flood WarningLIXLafourche, Saint Charles, Terrebonne85 min
Jun 19, 7:23 AM CDTFlash Flood WarningLCHCameron4 hr
Jun 21, 10:56 AM CDTFlash Flood WarningLCHAllen, Beauregard, Calcasieu, Jefferson Davis2 hr
Jul 3, 6:16 AM CDTFlash Flood WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard3 hr
Jul 7, 8:45 PM CDTFlash Flood WarningSHVCaldwell, Grant, LaSalle, Winn3 hr
Jul 11, 4:10 PM CDTFlash Flood WarningJANConcordia2 hr
Jul 11, 5:01 PM CDTFlash Flood WarningJANFranklin, Richland119 min
Aug 8, 8:34 PM CDTFlash Flood WarningJANWest Carroll81 min
Aug 17, 11:09 AM CDTFlash Flood WarningLIXOrleans, Saint Bernard64 min
Aug 18, 1:00 PM CDTFlash Flood WarningLIXJefferson, Orleans90 min
Aug 18, 1:06 PM CDTFlash Flood WarningLIXSaint Charles114 min
Sep 3, 5:21 AM CDTFlash Flood WarningLCHJefferson Davis4 hr
Sep 7, 1:24 PM CDTFlash Flood WarningJANMorehouse54 min
Sep 22, 3:06 PM CDTFlash Flood WarningSHVBossier, Caddo84 min
Sep 26, 12:10 PM CDTFlash Flood WarningJANConcordia3 hr
Sep 26, 4:18 PM CDTFlash Flood WarningJANEast Carroll, West Carroll3 hr
Oct 16, 3:43 AM CDTFlash Flood WarningLCHVermilion3 hr
Oct 16, 6:41 AM CDTFlash Flood WarningLCHIberia, Lafayette, Saint Martin, Vermilion6 hr
Nov 7, 3:31 PM CSTFlash Flood WarningLCHAcadia, Vermilion3 hr
Nov 7, 10:24 PM CSTFlash Flood WarningLCHLafayette, Saint Martin3 hr
Nov 8, 1:31 AM CSTFlash Flood WarningLCHCalcasieu, Cameron119 min
Nov 12, 4:09 AM CSTFlash Flood WarningSHVBossier, Caddo, De Soto3 hr
Dec 8, 3:52 AM CSTFlash Flood WarningLCHCalcasieu3 hr
Dec 8, 8:07 PM CSTFlash Flood WarningSHVBossier, Claiborne, Webster2 hr
Dec 27, 9:55 AM CSTFlash Flood WarningLCHAcadia, Calcasieu, Evangeline, Jefferson Davis3 hr
Dec 27, 9:57 AM CSTFlash Flood WarningLCHAvoyelles, Rapides3 hr
Dec 27, 10:17 AM CSTFlash Flood WarningJANConcordia, Tensas3 hr
Dec 27, 10:21 AM CSTFlash Flood WarningLCHAcadia2 hr
Dec 27, 11:03 AM CSTFlash Flood WarningLCHSaint Landry3 hr
Dec 27, 11:22 AM CSTFlash Flood WarningLCHLafayette, Vermilion3 hr
Dec 27, 12:07 PM CSTFlash Flood WarningLCHVermilion113 min
Dec 27, 12:50 PM CSTFlash Flood WarningLCHIberia, Saint Martin3 hr
Dec 27, 2:46 PM CSTFlash Flood WarningLIXEast Baton Rouge, Iberville, Livingston, Saint Helena, West Baton Rouge5 hr
Dec 27, 3:48 PM CSTFlash Flood WarningLIXLivingston, Saint Helena, Saint Tammany, Tangipahoa, Washington10 hr
Dec 27, 9:30 PM CSTFlash Flood Warning EmergencyLIXWashington3 hr
Dec 28, 12:42 AM CSTFlash Flood WarningLIXSaint Tammany, Washington3 hr
Dec 28, 1:33 AM CSTFlash Flood WarningLIXSaint Charles3 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

17 more counties

The busiest days

Days with the most alerts issued, by UTC date.

  1. February 21, 201816flash flood warnings
  2. December 27, 201810flash flood warnings
  3. February 22, 20187flash flood warnings
  4. March 29, 20186flash flood warnings
  5. January 27, 20184flash flood warnings
  6. April 14, 20183flash flood warnings
  7. December 28, 20183flash flood warnings
  8. February 25, 20182flash flood warnings
  9. February 26, 20182flash flood warnings
  10. April 7, 20182flash flood warnings
  11. May 26, 20182flash flood warnings
  12. July 11, 20182flash flood warnings

Nearby

Alerts in force nowTornadoes on recordThe radar archive20172019

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.