Alert archive / Louisiana / Flash Flood Warnings

Flash Flood Warnings in Louisiana, 2009

166 flash flood warnings in 2009. 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 2009. Tap one for its archive.

Flash Flood Warnings
166
Busiest month
October50 flash flood warnings
Busiest day
December 15, 200917 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.

96 of 167 flash flood warnings covering Louisiana in 2009 had a flash flood report inside them; 201 of 232 flash flood reports fell inside a warning, on average 83 minutes after it went out.

Louisiana, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Flash flood warnings1679643%23287%83 min

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Jackson, MS: flash flood warnings19110048%19893%107 min
NWS Shreveport, LA: flash flood warnings12610219%35692%110 min
NWS Lake Charles, LA: flash flood warnings502648%5680%87 min
NWS New Orleans, LA: flash flood warnings592459%6685%88 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 3, 9:31 PM CSTFlash Flood WarningLIXSaint Charles3 hr
Jan 3, 9:50 PM CSTFlash Flood WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard3 hr
Jan 4, 6:03 PM CSTFlash Flood WarningLCHSaint Landry117 min
Jan 4, 6:47 PM CSTFlash Flood WarningLCHEvangeline118 min
Feb 15, 5:11 AM CSTFlash Flood WarningLIXPlaquemines2 hr
Mar 26, 8:54 PM CDTFlash Flood WarningJANConcordia, Tensas3 hr
Mar 27, 1:15 AM CDTFlash Flood WarningLIXLafourche, Terrebonne3 hr
Mar 27, 2:08 AM CDTFlash Flood WarningLIXJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles3 hr
Mar 27, 5:00 AM CDTFlash Flood WarningLIXJefferson, Lafourche, Plaquemines, Saint Bernard, Saint Charles3 hr
Mar 27, 5:11 AM CDTFlash Flood WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles3 hr
Mar 27, 7:01 PM CDTFlash Flood WarningLIXEast Feliciana, West Feliciana3 hr
Mar 27, 9:42 PM CDTFlash Flood WarningLIXTangipahoa, Washington3 hr
Mar 27, 11:50 PM CDTFlash Flood WarningLIXEast Feliciana, Pointe Coupee, West Feliciana115 min
Mar 28, 12:30 AM CDTFlash Flood WarningLIXTangipahoa, Washington6 hr
Apr 2, 6:40 AM CDTFlash Flood WarningLIXJefferson, Lafourche, Plaquemines, Saint Bernard, Terrebonne3 hr
Apr 18, 6:18 PM CDTFlash Flood WarningLCHAllen, Beauregard, Calcasieu, Jefferson Davis, Rapides, Vernon4 hr
Apr 18, 8:31 PM CDTFlash Flood WarningLCHSaint Landry3 hr
Apr 18, 10:22 PM CDTFlash Flood WarningLCHAcadia, Lafayette, Saint Landry113 min
May 3, 7:18 AM CDTFlash Flood WarningSHVBossier, Caddo4 hr
May 3, 7:57 AM CDTFlash Flood WarningSHVBienville, Claiborne, Lincoln, Red River, Webster4 hr
May 3, 9:33 AM CDTFlash Flood WarningLCHBeauregard, Vernon117 min
May 3, 10:23 AM CDTFlash Flood WarningJANEast Carroll, West Carroll3 hr
May 3, 10:40 AM CDTFlash Flood WarningLCHAllen, Avoyelles, Beauregard, Evangeline, Rapides, Saint Landry and 1 more110 min
May 3, 11:30 AM CDTFlash Flood WarningLCHBeauregard, Vernon3 hr
May 3, 12:31 PM CDTFlash Flood WarningLCHAllen, Avoyelles, Beauregard, Calcasieu, Evangeline, Jefferson Davis and 3 more119 min
May 3, 1:47 PM CDTFlash Flood WarningLCHAcadia, Evangeline, Jefferson Davis, Lafayette, Saint Landry, Saint Martin118 min
May 3, 2:28 PM CDTFlash Flood WarningLCHAllen, Avoyelles, Beauregard, Calcasieu, Evangeline, Jefferson Davis and 3 more107 min
May 3, 3:44 PM CDTFlash Flood WarningLCHAcadia, Allen, Evangeline, Jefferson Davis, Saint Landry2 hr
May 3, 4:18 PM CDTFlash Flood WarningLCHAllen, Avoyelles, Beauregard, Evangeline, Rapides, Saint Landry and 1 more3 hr
May 4, 11:06 AM CDTFlash Flood WarningLCHSaint Martin114 min
May 6, 8:09 AM CDTFlash Flood WarningJANEast Carroll, Morehouse, Richland, West Carroll4 hr
May 6, 12:27 PM CDTFlash Flood WarningJANEast Carroll, Madison, Richland, West Carroll2 hr
May 10, 3:41 PM CDTFlash Flood WarningJANConcordia64 min
May 11, 9:09 AM CDTFlash Flood WarningJANMorehouse6 hr
May 11, 11:55 AM CDTFlash Flood WarningSHVBossier, Caddo2 hr
May 14, 1:13 PM CDTFlash Flood WarningLIXSaint Tammany92 min
Jul 7, 4:49 AM CDTFlash Flood WarningLCHAcadia3 hr
Jul 8, 3:07 PM CDTFlash Flood WarningLIXAscension, East Baton Rouge, Livingston113 min
Jul 16, 8:50 PM CDTFlash Flood WarningSHVBossier, Caddo3 hr
Jul 17, 1:39 PM CDTFlash Flood WarningLCHLafayette14 days
Jul 18, 5:22 PM CDTFlash Flood WarningLCHLafayette90 min
Jul 22, 5:31 AM CDTFlash Flood WarningJANCatahoula, Concordia119 min
Jul 22, 6:57 AM CDTFlash Flood WarningSHVGrant, Natchitoches, Winn2 hr
Jul 28, 7:52 AM CDTFlash Flood WarningSHVBossier, Caddo, Webster4 hr
Jul 28, 8:07 AM CDTFlash Flood WarningSHVWebster3 hr
Jul 28, 10:46 AM CDTFlash Flood WarningSHVBienville, De Soto, Red River4 hr
Jul 28, 10:53 AM CDTFlash Flood WarningSHVWebster112 min
Jul 28, 11:18 AM CDTFlash Flood WarningSHVCaldwell, Jackson, Natchitoches, Winn4 hr
Jul 28, 11:22 AM CDTFlash Flood WarningSHVBossier, Caddo3 hr
Jul 29, 8:02 PM CDTFlash Flood WarningJANEast Carroll, Morehouse, West Carroll3 hr
Jul 29, 11:00 PM CDTFlash Flood WarningJANEast Carroll, Morehouse, West Carroll2 hr
Aug 1, 1:50 PM CDTFlash Flood WarningSHVBossier, Caddo3 hr
Aug 6, 8:07 AM CDTFlash Flood WarningJANEast Carroll, Madison, Tensas3 hr
Aug 6, 9:25 AM CDTFlash Flood WarningJANEast Carroll, Franklin, Madison, Morehouse, Richland, West Carroll2 hr
Aug 6, 9:26 AM CDTFlash Flood WarningJANTensas90 min
Aug 6, 10:42 AM CDTFlash Flood WarningJANCatahoula2 hr
Aug 10, 1:23 PM CDTFlash Flood WarningLIXJefferson65 min
Aug 20, 3:30 PM CDTFlash Flood WarningJANEast Carroll, Madison, Richland, West Carroll2 hr
Aug 20, 4:19 PM CDTFlash Flood WarningJANFranklin, Madison, Richland, Tensas95 min
Aug 20, 5:39 PM CDTFlash Flood WarningLCHVermilion66 min
Aug 21, 1:58 PM CDTFlash Flood WarningLCHSt. Mary2 hr
Aug 29, 9:50 PM CDTFlash Flood WarningLIXPointe Coupee, West Feliciana115 min
Sep 6, 12:51 PM CDTFlash Flood WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard74 min
Sep 13, 12:06 PM CDTFlash Flood WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard3 hr
Sep 14, 3:37 PM CDTFlash Flood WarningSHVCaddo4 hr
Sep 14, 5:37 PM CDTFlash Flood WarningSHVUnion3 hr
Sep 14, 7:20 PM CDTFlash Flood WarningSHVOuachita3 hr
Sep 15, 3:02 AM CDTFlash Flood WarningSHVOuachita3 hr
Sep 17, 7:26 PM CDTFlash Flood WarningSHVUnion8 hr
Sep 17, 9:33 PM CDTFlash Flood WarningJANMorehouse117 min
Oct 5, 3:58 AM CDTFlash Flood WarningLIXSaint Tammany92 min
Oct 5, 8:07 AM CDTFlash Flood WarningLIXSaint Tammany83 min
Oct 7, 2:26 AM CDTFlash Flood WarningSHVOuachita3 hr
Oct 7, 2:36 AM CDTFlash Flood WarningJANMorehouse, Richland, West Carroll114 min
Oct 9, 7:51 AM CDTFlash Flood WarningSHVBossier, Caddo3 hr
Oct 11, 8:58 AM CDTFlash Flood WarningLIXEast Baton Rouge, Livingston, West Baton Rouge77 min
Oct 12, 8:52 AM CDTFlash Flood WarningSHVBossier, Caddo, Claiborne, Union, Webster4 hr
Oct 12, 11:03 AM CDTFlash Flood WarningJANMorehouse5 hr
Oct 13, 1:26 PM CDTFlash Flood WarningSHVBossier, Caddo, Webster4 hr
Oct 13, 3:23 PM CDTFlash Flood WarningSHVBienville, Claiborne, Jackson, Lincoln, Union, Webster112 min
Oct 13, 3:43 PM CDTFlash Flood WarningJANEast Carroll, Morehouse, West Carroll6 hr
Oct 13, 4:12 PM CDTFlash Flood WarningSHVOuachita2 hr
Oct 13, 4:52 PM CDTFlash Flood WarningSHVBienville, Bossier, Caddo, De Soto, Red River, Webster38 min
Oct 13, 4:53 PM CDTFlash Flood WarningJANFranklin, Madison, Richland6 hr
Oct 13, 5:24 PM CDTFlash Flood WarningSHVBienville, Claiborne, Jackson, Lincoln, Union, Webster4 hr
Oct 13, 5:31 PM CDTFlash Flood WarningSHVBienville, Bossier, Caddo, De Soto, Natchitoches, Red River and 2 more3 hr
Oct 13, 6:04 PM CDTFlash Flood WarningSHVCaldwell, Ouachita4 hr
Oct 13, 7:45 PM CDTFlash Flood WarningJANTensas3 hr
Oct 15, 10:33 AM CDTFlash Flood WarningSHVJackson, Lincoln, Ouachita, Union3 hr
Oct 15, 11:37 AM CDTFlash Flood WarningJANFranklin, Madison, Richland, Tensas113 min
Oct 15, 1:08 PM CDTFlash Flood WarningJANMadison, Tensas112 min
Oct 15, 1:31 PM CDTFlash Flood WarningJANFranklin, Madison, Richland, Tensas59 min
Oct 15, 8:46 PM CDTFlash Flood WarningLIXWashington3 hr
Oct 22, 9:51 AM CDTFlash Flood WarningLCHBeauregard, Calcasieu, Cameron, Vernon3 hr
Oct 22, 12:12 PM CDTFlash Flood WarningLCHCameron3 hr
Oct 22, 12:13 PM CDTFlash Flood WarningSHVBossier2 hr
Oct 22, 12:39 PM CDTFlash Flood WarningSHVNatchitoches, Red River111 min
Oct 22, 1:07 PM CDTFlash Flood WarningLCHAllen, Beauregard, Calcasieu, Jefferson Davis3 hr
Oct 22, 2:50 PM CDTFlash Flood WarningLCHRapides3 hr
Oct 22, 6:00 PM CDTFlash Flood WarningJANEast Carroll3 hr
Oct 26, 4:00 PM CDTFlash Flood WarningLCHCalcasieu3 hr
Oct 26, 6:56 PM CDTFlash Flood WarningLCHCalcasieu3 hr
Oct 29, 4:52 PM CDTFlash Flood WarningSHVWebster4 hr
Oct 29, 5:24 PM CDTFlash Flood WarningSHVBossier, Caddo4 hr
Oct 29, 6:16 PM CDTFlash Flood Warning EmergencySHVBossier, Caddo, De Soto3 hr
Oct 29, 7:49 PM CDTFlash Flood WarningSHVBossier, Claiborne, Webster8 hr
Oct 29, 9:13 PM CDTFlash Flood WarningSHVBossier, Caddo, De Soto4 hr
Oct 29, 10:21 PM CDTFlash Flood WarningSHVBienville, Claiborne, Lincoln, Red River, Union4 hr
Oct 29, 11:59 PM CDTFlash Flood WarningLCHVernon5 hr
Oct 30, 12:53 AM CDTFlash Flood WarningLCHBeauregard3 hr
Oct 30, 12:55 AM CDTFlash Flood WarningSHVBossier, Caddo, De Soto4 hr
Oct 30, 1:27 AM CDTFlash Flood WarningJANMorehouse8 hr
Oct 30, 1:30 AM CDTFlash Flood WarningSHVGrant, Jackson, Natchitoches, Ouachita, Winn7 hr
Oct 30, 2:13 AM CDTFlash Flood WarningSHVBienville, Lincoln, Red River, Union4 hr
Oct 30, 2:53 AM CDTFlash Flood WarningJANMorehouse, Richland, West Carroll4 hr
Oct 30, 3:45 AM CDTFlash Flood WarningSHVClaiborne, Webster4 hr
Oct 30, 5:57 AM CDTFlash Flood WarningLCHBeauregard, Calcasieu, Vernon4 hr
Oct 30, 6:29 AM CDTFlash Flood WarningSHVBienville, Lincoln, Red River, Union3 hr
Oct 30, 9:45 AM CDTFlash Flood WarningLCHBeauregard, Calcasieu, Vernon4 hr
Oct 31, 5:51 PM CDTFlash Flood WarningSHVBossier12 hr
Nov 1, 4:53 AM CSTFlash Flood WarningSHVBossier11 hr
Dec 8, 1:51 AM CSTFlash Flood WarningLIXAssumption, Lafourche, Saint James, Saint John the Baptist3 hr
Dec 8, 3:27 AM CSTFlash Flood WarningLCHIberia2 hr
Dec 12, 4:28 PM CSTFlash Flood WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles8 hr
Dec 12, 5:39 PM CSTFlash Flood WarningLIXOrleans, Saint Bernard, Saint Tammany2 hr
Dec 12, 6:43 PM CSTFlash Flood WarningLIXJefferson, Lafourche, Plaquemines, Saint Bernard, Saint Charles3 hr
Dec 12, 7:41 PM CSTFlash Flood WarningLIXLafourche, Saint Charles, Saint John the Baptist, Terrebonne2 hr
Dec 12, 7:46 PM CSTFlash Flood WarningLIXSaint Tammany6 hr
Dec 12, 10:00 PM CSTFlash Flood WarningLIXJefferson, Lafourche, Plaquemines, Saint Bernard, Saint Charles, Saint John the Baptist and 1 more3 hr
Dec 14, 10:30 AM CSTFlash Flood WarningLIXAssumption, Lafourche, Saint James3 hr
Dec 14, 11:58 AM CSTFlash Flood WarningLIXAscension, Livingston3 hr
Dec 14, 12:49 PM CSTFlash Flood WarningLIXLivingston, Saint Helena, Tangipahoa, Washington3 hr
Dec 14, 1:57 PM CSTFlash Flood WarningLIXSaint Tammany, Tangipahoa, Washington3 hr
Dec 14, 3:44 PM CSTFlash Flood WarningLIXEast Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, West Baton Rouge and 1 more3 hr
Dec 14, 4:13 PM CSTFlash Flood WarningLCHIberia, Lafayette, Saint Landry, Saint Martin, St. Mary, Vermilion6 hr
Dec 14, 4:44 PM CSTFlash Flood WarningLIXAscension, Assumption, East Baton Rouge, Iberville, Livingston, Saint Helena and 4 more106 min
Dec 14, 5:33 PM CSTFlash Flood WarningLIXWashington57 min
Dec 14, 6:27 PM CSTFlash Flood WarningLIXLivingston, Saint John the Baptist, Saint Tammany, Tangipahoa, Washington3 hr
Dec 14, 6:36 PM CSTFlash Flood WarningLIXAscension, Assumption, Lafourche, Saint Charles, Saint James, Saint John the Baptist and 1 more114 min
Dec 14, 6:57 PM CSTFlash Flood WarningLIXJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles78 min
Dec 14, 8:20 PM CSTFlash Flood WarningLIXJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles5 hr
Dec 14, 8:49 PM CSTFlash Flood WarningLIXAscension, Assumption, Lafourche, Saint Charles, Saint James, Saint John the Baptist and 1 more5 hr
Dec 14, 10:19 PM CSTFlash Flood WarningLCHIberia, Lafayette, Saint Landry, Saint Martin, St. Mary, Vermilion6 hr
Dec 15, 2:07 AM CSTFlash Flood WarningLIXJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 2 more113 min
Dec 15, 2:43 AM CSTFlash Flood WarningLCHRapides, Vernon4 hr
Dec 15, 4:00 AM CSTFlash Flood WarningLIXAssumption, Jefferson, Lafourche, Saint Charles, Saint James, Saint John the Baptist and 1 more105 min
Dec 15, 4:32 AM CSTFlash Flood WarningLCHCameron, Iberia, Saint Martin, St. Mary, Vermilion6 hr
Dec 15, 6:05 AM CSTFlash Flood WarningLIXJefferson, Lafourche, Orleans, Saint Charles3 hr
Dec 15, 6:44 AM CSTFlash Flood WarningLIXLafourche, Saint Charles, Saint John the Baptist, Terrebonne2 hr
Dec 15, 8:50 AM CSTFlash Flood WarningLIXJefferson, Lafourche, Orleans, Saint Charles, Saint John the Baptist3 hr
Dec 15, 10:01 AM CSTFlash Flood WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles3 hr
Dec 15, 10:04 AM CSTFlash Flood WarningLIXAssumption, Lafourche, Terrebonne3 hr
Dec 15, 11:49 AM CSTFlash Flood WarningLIXJefferson, Lafourche, Orleans, Saint Charles, Saint John the Baptist3 hr
Dec 15, 2:57 PM CSTFlash Flood WarningLIXLafourche, Saint Charles4 hr
Dec 15, 7:39 PM CSTFlash Flood WarningLIXLafourche, Saint Charles3 hr
Dec 17, 10:40 PM CSTFlash Flood WarningLCHIberia, Lafayette, Saint Landry, Saint Martin, Vermilion20 min
Dec 17, 10:56 PM CSTFlash Flood WarningLCHIberia, Lafayette, Saint Landry, Saint Martin, Vermilion3 hr
Dec 23, 9:29 PM CSTFlash Flood WarningSHVCaddo3 hr
Dec 24, 12:15 AM CSTFlash Flood WarningSHVCaddo, De Soto, Sabine3 hr
Dec 24, 12:41 AM CSTFlash Flood WarningSHVCaddo4 hr
Dec 24, 2:35 AM CSTFlash Flood WarningSHVBienville, Bossier, Caddo, De Soto, Natchitoches, Red River and 2 more3 hr
Dec 24, 3:37 AM CSTFlash Flood WarningSHVBienville, Claiborne, Lincoln, Union, Webster4 hr
Dec 24, 5:32 AM CSTFlash Flood WarningSHVBienville, Claiborne, Lincoln, Union4 hr
Dec 24, 5:54 AM CSTFlash Flood WarningSHVBienville, De Soto, Natchitoches, Red River, Sabine4 hr
Dec 24, 8:02 AM CSTFlash Flood WarningJANMorehouse, Richland, West Carroll4 hr
Dec 24, 9:02 AM CSTFlash Flood WarningJANEast Carroll, Franklin, Madison, Tensas3 hr

By county

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

23 more counties

The busiest days

Days with the most alerts issued, by UTC date.

  1. December 15, 200917flash flood warnings
  2. October 30, 200914flash flood warnings
  3. May 3, 200911flash flood warnings
  4. October 13, 20099flash flood warnings
  5. December 24, 20099flash flood warnings
  6. December 14, 20098flash flood warnings
  7. October 22, 20097flash flood warnings
  8. July 28, 20096flash flood warnings
  9. March 27, 20095flash flood warnings
  10. March 28, 20094flash flood warnings
  11. August 6, 20094flash flood warnings
  12. October 15, 20094flash flood warnings

Nearby

Alerts in force nowTornadoes on recordThe radar archive20082010

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.