Alert archive / Illinois / Flash Flood Warnings

Flash Flood Warnings in Illinois, 2026

218 flash flood warnings in 2026. 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 2026. Tap one for its archive.

Flash Flood Warnings
218
Busiest month
June75 flash flood warnings
Busiest day
June 11, 202615 flash flood warnings

Over time

By month

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 8, 8:01 PM CSTFlash Flood WarningLOTCook, DuPage, Will2 hr
Jan 8, 9:01 PM CSTFlash Flood WarningLOTCook, Will90 min
Mar 5, 12:49 AM CSTFlash Flood WarningPAHAlexander, Johnson, Pulaski, Union7 hr
Mar 6, 5:46 PM CSTFlash Flood WarningLOTCook, Will3 hr
Mar 10, 8:01 PM CDTFlash Flood WarningDVNBureau3 hr
Mar 10, 8:10 PM CDTFlash Flood WarningLOTLaSalle3 hr
Mar 10, 9:11 PM CDTFlash Flood WarningDVNHenry90 min
Mar 11, 4:58 AM CDTFlash Flood WarningILXMacon86 min
Apr 3, 7:05 PM CDTFlash Flood WarningILXMcLean, Tazewell, Woodford3 hr
Apr 3, 7:54 PM CDTFlash Flood WarningILXMcLean, Woodford3 hr
Apr 3, 8:08 PM CDTFlash Flood WarningLOTLivingston6 hr
Apr 3, 9:46 PM CDTFlash Flood WarningLOTGrundy, Kankakee, Livingston, Will4 hr
Apr 14, 7:12 PM CDTFlash Flood WarningDVNJo Daviess3 hr
Apr 14, 7:58 PM CDTFlash Flood WarningDVNJo Daviess, Stephenson3 hr
Apr 14, 8:37 PM CDTFlash Flood WarningLOTBoone, Winnebago3 hr
Apr 14, 10:51 PM CDTFlash Flood WarningLOTCook, DuPage3 hr
Apr 15, 7:00 PM CDTFlash Flood WarningDVNJo Daviess4 hr
Apr 15, 7:14 PM CDTFlash Flood WarningDVNJo Daviess, Stephenson3 hr
Apr 15, 8:14 PM CDTFlash Flood WarningDVNCarroll, Jo Daviess3 hr
Apr 15, 8:27 PM CDTFlash Flood WarningLOTBoone, Winnebago4 hr
Apr 17, 2:23 PM CDTFlash Flood WarningDVNJo Daviess6 hr
Apr 17, 7:26 PM CDTFlash Flood WarningLOTWinnebago4 hr
Apr 17, 8:12 PM CDTFlash Flood WarningLOTBoone, Lake, McHenry6 hr
Apr 27, 9:54 AM CDTFlash Flood WarningDVNHancock104 min
Apr 27, 10:04 AM CDTFlash Flood WarningILXSangamon2 hr
Apr 27, 1:07 PM CDTFlash Flood WarningLSXFayette, Montgomery7 hr
Apr 27, 1:11 PM CDTFlash Flood WarningILXClay, Cumberland, Effingham, Jasper, Shelby19 hr
Apr 27, 4:52 PM CDTFlash Flood WarningLSXAdams, Pike4 hr
Apr 27, 5:20 PM CDTFlash Flood WarningLSXBrown, Pike3 hr
Apr 27, 5:32 PM CDTFlash Flood WarningLSXJersey5 hr
Apr 27, 5:50 PM CDTFlash Flood WarningILXCass, Menard, Morgan, Sangamon, Scott2 hr
Apr 27, 6:47 PM CDTFlash Flood WarningLSXMacoupin5 hr
Apr 27, 7:16 PM CDTFlash Flood WarningLSXMontgomery5 hr
Apr 27, 7:59 PM CDTFlash Flood WarningLSXFayette6 hr
Apr 27, 9:33 PM CDTFlash Flood WarningILXCrawford, Jasper3 hr
May 18, 1:44 PM CDTFlash Flood WarningILXClay, Effingham, Jasper4 hr
May 18, 2:11 PM CDTFlash Flood WarningLSXClinton, Fayette, Marion6 hr
May 18, 2:52 PM CDTFlash Flood WarningILXClay3 hr
May 18, 2:54 PM CDTFlash Flood WarningLSXBond, Clinton, Fayette, Madison, Marion, Saint Clair and 1 more6 hr
May 18, 5:06 PM CDTFlash Flood WarningLSXClinton, Madison, Monroe, Saint Clair4 hr
Jun 1, 4:37 AM CDTFlash Flood WarningLSXCalhoun, Greene, Jersey5 hr
Jun 1, 8:04 AM CDTFlash Flood WarningPAHPope4 hr
Jun 6, 9:20 PM CDTFlash Flood WarningILXVermilion4 hr
Jun 7, 11:13 AM CDTFlash Flood WarningDVNBureau5 hr
Jun 7, 1:09 PM CDTFlash Flood WarningDVNHenry6 hr
Jun 7, 1:47 PM CDTFlash Flood WarningDVNRock Island2 hr
Jun 8, 10:22 AM CDTFlash Flood WarningILXMorgan, Sangamon3 hr
Jun 8, 10:32 AM CDTFlash Flood WarningLSXCalhoun, Jersey, Madison3 hr
Jun 8, 10:54 AM CDTFlash Flood WarningLSXMadison2 hr
Jun 8, 11:55 AM CDTFlash Flood WarningILXMoultrie, Shelby5 hr
Jun 8, 1:25 PM CDTFlash Flood WarningILXColes, Cumberland, Moultrie, Shelby3 hr
Jun 8, 1:58 PM CDTFlash Flood WarningILXColes, Effingham, Jasper6 min
Jun 8, 2:04 PM CDTFlash Flood WarningILXColes, Cumberland, Effingham, Jasper3 hr
Jun 8, 5:29 PM CDTFlash Flood WarningPAHAlexander, Union3 hr
Jun 8, 6:17 PM CDTFlash Flood WarningLSXClinton, Marion3 hr
Jun 8, 6:32 PM CDTFlash Flood WarningILXMenard, Sangamon2 hr
Jun 9, 1:50 PM CDTFlash Flood WarningILXFulton77 min
Jun 10, 8:07 PM CDTFlash Flood WarningILXKnox, Peoria, Stark3 hr
Jun 10, 8:19 PM CDTFlash Flood WarningDVNHancock5 hr
Jun 10, 9:14 PM CDTFlash Flood WarningILXFulton, Knox, Marshall, Peoria, Stark, Woodford5 hr
Jun 10, 10:00 PM CDTFlash Flood WarningILXFulton, Mason, Peoria, Tazewell4 hr
Jun 10, 11:05 PM CDTFlash Flood WarningLSXAdams3 hr
Jun 10, 11:46 PM CDTFlash Flood WarningILXMcLean, Tazewell, Woodford4 hr
Jun 11, 2:11 AM CDTFlash Flood WarningILXSangamon3 hr
Jun 11, 2:32 AM CDTFlash Flood WarningILXMacon56 min
Jun 11, 4:57 PM CDTFlash Flood WarningDVNJo Daviess, Stephenson3 hr
Jun 11, 5:02 PM CDTFlash Flood WarningDVNHancock, McDonough4 hr
Jun 11, 5:30 PM CDTFlash Flood WarningLOTWinnebago4 hr
Jun 11, 5:40 PM CDTFlash Flood WarningILXFulton, Peoria5 hr
Jun 11, 5:52 PM CDTFlash Flood WarningLOTBoone3 hr
Jun 11, 6:27 PM CDTFlash Flood WarningLOTMcHenry3 hr
Jun 11, 6:28 PM CDTFlash Flood WarningLOTLake3 hr
Jun 11, 7:01 PM CDTFlash Flood WarningILXCass, Logan, Mason, Menard, Morgan, Sangamon and 2 more4 hr
Jun 11, 7:24 PM CDTFlash Flood WarningILXDeWitt, Logan, Macon, Piatt4 hr
Jun 11, 7:55 PM CDTFlash Flood WarningILXChristian, Macon, Morgan, Piatt, Sangamon3 hr
Jun 17, 7:55 AM CDTFlash Flood WarningDVNMercer, Rock Island5 hr
Jun 17, 8:25 AM CDTFlash Flood WarningDVNHenry, Rock Island5 hr
Jun 17, 8:45 AM CDTFlash Flood WarningDVNHenry, Mercer, Rock Island, Warren4 hr
Jun 17, 9:08 AM CDTFlash Flood WarningDVNMcDonough, Warren6 hr
Jun 17, 3:41 PM CDTFlash Flood WarningILXDeWitt, Logan, McLean, Tazewell3 hr
Jun 17, 3:50 PM CDTFlash Flood WarningILXMcLean, Peoria, Tazewell, Woodford3 hr
Jun 17, 3:55 PM CDTFlash Flood WarningLOTCook3 hr
Jun 17, 4:19 PM CDTFlash Flood WarningILXChampaign, DeWitt, McLean, Piatt3 hr
Jun 17, 6:11 PM CDTFlash Flood WarningILXChristian, Logan, Macon, Menard, Moultrie, Sangamon4 hr
Jun 17, 6:16 PM CDTFlash Flood WarningILXChampaign, Piatt, Vermilion4 hr
Jun 17, 6:40 PM CDTFlash Flood WarningILXClark, Coles, Douglas, Edgar3 hr
Jun 21, 3:09 PM CDTFlash Flood WarningILXEffingham, Shelby4 hr
Jun 21, 3:26 PM CDTFlash Flood WarningLSXBond, Fayette, Montgomery4 hr
Jun 21, 3:44 PM CDTFlash Flood WarningLSXFayette6 hr
Jun 21, 3:56 PM CDTFlash Flood WarningILXClay, Effingham4 hr
Jun 21, 4:06 PM CDTFlash Flood WarningILXCumberland, Effingham3 hr
Jun 21, 4:27 PM CDTFlash Flood WarningLSXMarion6 hr
Jun 21, 4:37 PM CDTFlash Flood WarningILXClark, Clay, Cumberland, Jasper, Richland3 hr
Jun 21, 4:55 PM CDTFlash Flood WarningILXClark, Crawford3 hr
Jun 21, 6:11 PM CDTFlash Flood WarningILXClay, Lawrence, Richland104 min
Jun 21, 7:58 PM CDTFlash Flood WarningPAHEdwards, Wabash, Wayne6 hr
Jun 21, 9:18 PM CDTFlash Flood WarningPAHWabash6 hr
Jun 24, 8:37 PM CDTFlash Flood WarningLOTCook2 hr
Jun 25, 5:24 PM CDTFlash Flood WarningILXClay, Effingham, Jasper5 hr
Jun 25, 9:03 PM CDTFlash Flood WarningLSXRandolph4 hr
Jun 25, 9:53 PM CDTFlash Flood WarningPAHJackson, Perry5 hr
Jun 26, 4:52 AM CDTFlash Flood WarningPAHJohnson, Union3 hr
Jun 26, 3:43 PM CDTFlash Flood WarningPAHAlexander4 hr
Jun 26, 4:10 PM CDTFlash Flood WarningPAHPulaski3 hr
Jun 26, 11:57 PM CDTFlash Flood WarningPAHWabash8 hr
Jun 27, 7:59 AM CDTFlash Flood WarningPAHEdwards, Wabash, White5 hr
Jun 27, 12:14 PM CDTFlash Flood WarningPAHAlexander, Union2 hr
Jun 27, 12:59 PM CDTFlash Flood WarningLSXMarion4 hr
Jun 27, 1:18 PM CDTFlash Flood WarningILXClay, Crawford, Effingham, Jasper, Lawrence, Richland6 hr
Jun 27, 1:27 PM CDTFlash Flood WarningPAHEdwards, Jefferson, Wabash, Wayne4 hr
Jun 27, 2:33 PM CDTFlash Flood WarningPAHEdwards, Wabash6 hr
Jun 27, 3:16 PM CDTFlash Flood WarningPAHWhite3 hr
Jun 27, 3:19 PM CDTFlash Flood WarningILXClark, Crawford, Cumberland, Jasper4 hr
Jun 27, 3:52 PM CDTFlash Flood WarningILXClark, Coles, Edgar4 hr
Jun 27, 6:16 PM CDTFlash Flood WarningPAHMassac, Pope77 min
Jul 2, 11:17 PM CDTFlash Flood WarningLOTDuPage, Kane, Kendall3 hr
Jul 3, 12:16 AM CDTFlash Flood WarningLOTDeKalb, Kane, Kendall114 min
Jul 3, 6:04 PM CDTFlash Flood WarningILXClay3 hr
Jul 3, 7:50 PM CDTFlash Flood WarningDVNRock Island3 hr
Jul 3, 10:09 PM CDTFlash Flood WarningLOTCook2 hr
Jul 3, 10:38 PM CDTFlash Flood Warning Considerable damage threatLOTCook3 hr
Jul 3, 10:50 PM CDTFlash Flood WarningLOTCook, Will108 min
Jul 4, 2:03 PM CDTFlash Flood WarningLOTDeKalb, LaSalle, Lee3 hr
Jul 4, 2:55 PM CDTFlash Flood WarningLOTKane, Kendall6 hr
Jul 4, 2:58 PM CDTFlash Flood WarningDVNBureau, Putnam5 hr
Jul 4, 3:07 PM CDTFlash Flood WarningLOTCook, DuPage, Kane6 hr
Jul 4, 3:10 PM CDTFlash Flood Warning Considerable damage threatLOTKane, Kendall4 hr
Jul 4, 3:24 PM CDTFlash Flood WarningLOTDuPage, Will5 hr
Jul 4, 3:55 PM CDTFlash Flood Warning Considerable damage threatLOTCook, DuPage, Kane3 hr
Jul 4, 4:19 PM CDTFlash Flood WarningLOTCook, Will3 hr
Jul 4, 4:35 PM CDTFlash Flood Warning Considerable damage threatLOTDuPage, Will2 hr
Jul 4, 5:09 PM CDTFlash Flood Warning Considerable damage threatLOTCook109 min
Jul 4, 5:18 PM CDTFlash Flood WarningLOTCook100 min
Jul 9, 10:58 PM CDTFlash Flood WarningPAHAlexander8 hr
Jul 9, 11:06 PM CDTFlash Flood WarningPAHPulaski8 hr
Jul 10, 12:09 AM CDTFlash Flood WarningPAHJackson6 hr
Jul 10, 12:31 AM CDTFlash Flood WarningPAHJohnson, Union, Williamson6 hr
Jul 10, 1:27 AM CDTFlash Flood WarningPAHMassac5 hr
Jul 10, 2:09 AM CDTFlash Flood WarningPAHPope4 hr
Jul 10, 9:30 PM CDTFlash Flood WarningLSXMonroe, Randolph, Saint Clair, Washington6 hr
Jul 10, 9:58 PM CDTFlash Flood WarningLSXMonroe, Saint Clair4 hr
Jul 10, 10:40 PM CDTFlash Flood WarningPAHJackson, Perry, Williamson9 hr
Jul 10, 11:09 PM CDTFlash Flood WarningPAHHardin, Johnson, Massac, Pope, Union9 hr
Jul 10, 11:34 PM CDTFlash Flood WarningILXMacon, Sangamon3 hr
Jul 11, 12:29 AM CDTFlash Flood WarningILXColes, Edgar3 hr
Jul 11, 1:08 AM CDTFlash Flood WarningILXClark3 hr
Jul 11, 4:19 AM CDTFlash Flood WarningPAHJackson, Union4 hr
Jul 11, 6:40 AM CDTFlash Flood WarningILXVermilion3 hr
Jul 20, 12:20 PM CDTFlash Flood WarningDVNRock Island2 hr
Jul 27, 12:56 AM CDTFlash Flood WarningPAHEdwards, Wabash3 hr
Jul 27, 2:24 AM CDTFlash Flood WarningILXEffingham4 hr
Jul 27, 2:50 AM CDTFlash Flood WarningILXClay5 hr
Jul 27, 2:54 AM CDTFlash Flood WarningPAHHardin119 min
Jul 27, 12:02 PM CDTFlash Flood WarningLOTCook, DuPage4 hr
Jul 27, 1:05 PM CDTFlash Flood WarningLOTCook, Will4 hr
Jul 27, 3:36 PM CDTFlash Flood WarningLOTKendall, Will3 hr
Jul 27, 6:59 PM CDTFlash Flood WarningILXClark, Edgar3 hr
Aug 1, 6:25 AM CDTFlash Flood WarningLOTKendall, Will3 hr
Aug 1, 7:41 AM CDTFlash Flood WarningLOTCook, DuPage92 min
Aug 1, 1:46 PM CDTFlash Flood WarningILXVermilion3 hr
Aug 9, 10:10 PM CDTFlash Flood WarningLOTLee3 hr
Aug 9, 11:47 PM CDTFlash Flood WarningLOTGrundy, LaSalle, Livingston3 hr
Aug 10, 12:01 AM CDTFlash Flood WarningLOTLaSalle2 hr
Aug 10, 1:18 AM CDTFlash Flood WarningLOTFord, Kankakee, Livingston91 min
Aug 10, 1:52 AM CDTFlash Flood WarningLOTFord, Iroquois, Kankakee58 min
Aug 12, 7:18 AM CDTFlash Flood WarningDVNRock Island94 min
Aug 12, 9:37 AM CDTFlash Flood WarningLOTGrundy, Kankakee, Kendall, LaSalle, Will3 hr
Aug 13, 2:10 PM CDTFlash Flood WarningILXChampaign, DeWitt, McLean, Piatt2 hr
Aug 13, 2:47 PM CDTFlash Flood WarningILXChampaign, Vermilion2 hr
Aug 13, 11:21 PM CDTFlash Flood WarningILXKnox, Marshall, Peoria, Stark, Woodford4 hr
Aug 14, 12:40 AM CDTFlash Flood WarningILXVermilion12 hr
Aug 14, 12:48 AM CDTFlash Flood WarningLOTFord, Iroquois3 hr
Aug 14, 1:21 AM CDTFlash Flood Warning Considerable damage threatLOTFord, Iroquois6 hr
Aug 14, 1:38 AM CDTFlash Flood WarningILXChampaign, McLean7 hr
Aug 14, 2:59 AM CDTFlash Flood WarningILXChampaign, Vermilion6 hr
Aug 14, 3:44 AM CDTFlash Flood WarningDVNHenderson, Warren6 hr
Aug 14, 4:07 AM CDTFlash Flood WarningILXFulton, Knox, Peoria, Tazewell6 hr
Aug 14, 4:59 AM CDTFlash Flood WarningDVNHenderson, Mercer, Warren6 hr
Aug 14, 5:47 AM CDTFlash Flood WarningILXDeWitt, Piatt3 hr
Aug 14, 6:47 AM CDTFlash Flood WarningILXColes, Douglas, Edgar11 hr
Aug 14, 8:14 AM CDTFlash Flood WarningILXClark, Coles, Cumberland, Edgar3 hr
Aug 14, 10:00 AM CDTFlash Flood WarningILXCass, Fulton, Logan, Mason, Menard, Sangamon4 hr
Aug 14, 11:56 PM CDTFlash Flood WarningILXFulton, Knox, Mason, Peoria, Tazewell, Woodford7 hr
Aug 15, 12:58 AM CDTFlash Flood WarningDVNHancock6 hr
Aug 15, 1:09 AM CDTFlash Flood WarningILXMcLean6 hr
Aug 15, 1:50 AM CDTFlash Flood WarningLOTFord, Iroquois6 hr
Aug 15, 1:55 AM CDTFlash Flood WarningDVNHenderson, McDonough, Warren6 hr
Aug 15, 2:19 AM CDTFlash Flood WarningILXMcLean5 hr
Aug 15, 2:36 AM CDTFlash Flood Warning Considerable damage threatILXMcLean6 hr
Aug 15, 3:19 AM CDTFlash Flood WarningDVNHenderson5 hr
Aug 15, 3:23 AM CDTFlash Flood WarningILXChampaign5 hr
Aug 15, 3:23 AM CDTFlash Flood Warning Considerable damage threatLOTFord5 hr
Aug 15, 3:54 AM CDTFlash Flood WarningILXVermilion4 hr
Aug 15, 5:48 AM CDTFlash Flood Warning Considerable damage threatILXChampaign, Vermilion8 hr
Aug 15, 8:04 AM CDTFlash Flood WarningILXMcLean5 hr
Aug 15, 8:38 AM CDTFlash Flood Warning Considerable damage threatILXMcLean4 hr
Aug 15, 9:23 PM CDTFlash Flood WarningDVNMercer6 hr
Aug 19, 4:36 PM CDTFlash Flood WarningDVNHenderson2 hr
Aug 19, 5:43 PM CDTFlash Flood WarningILXKnox3 hr
Aug 19, 6:06 PM CDTFlash Flood WarningDVNMercer2 hr
Aug 19, 6:13 PM CDTFlash Flood WarningILXVermilion3 hr
Aug 19, 6:36 PM CDTFlash Flood WarningDVNMercer113 min
Aug 19, 6:52 PM CDTFlash Flood WarningILXTazewell, Woodford6 hr
Aug 19, 6:58 PM CDTFlash Flood WarningILXChampaign2 hr
Aug 19, 7:13 PM CDTFlash Flood WarningILXMarshall, Stark2 hr
Aug 19, 9:30 PM CDTFlash Flood WarningILXChampaign, DeWitt, Piatt3 hr
Aug 19, 10:44 PM CDTFlash Flood WarningILXChampaign3 hr
Aug 19, 11:32 PM CDTFlash Flood WarningILXChampaign, Vermilion3 hr
Aug 19, 11:42 PM CDTFlash Flood WarningPAHAlexander5 hr
Aug 19, 11:57 PM CDTFlash Flood WarningPAHPulaski6 hr
Aug 21, 8:12 PM CDTFlash Flood WarningDVNBureau, Putnam4 hr
Aug 21, 8:19 PM CDTFlash Flood WarningLOTLaSalle4 hr
Aug 21, 8:40 PM CDTFlash Flood WarningILXMarshall3 hr
Sep 17, 7:07 AM CDTFlash Flood WarningLOTDeKalb, LaSalle, Lee2 hr
Sep 19, 4:19 AM CDTFlash Flood WarningDVNJo Daviess, Stephenson6 hr
Sep 20, 1:38 AM CDTFlash Flood WarningDVNBureau, Henry, Mercer, Rock Island, Whiteside6 hr
Sep 20, 2:12 AM CDTFlash Flood WarningLOTDeKalb, LaSalle, Lee5 hr
Sep 20, 5:12 AM CDTFlash Flood WarningDVNJo Daviess4 hr

By county

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

56 more counties

The busiest days

Days with the most alerts issued, by UTC date.

  1. June 11, 202615flash flood warnings
  2. July 4, 202615flash flood warnings
  3. August 15, 202614flash flood warnings
  4. August 14, 202613flash flood warnings
  5. June 17, 202611flash flood warnings
  6. June 27, 202611flash flood warnings
  7. June 8, 202610flash flood warnings
  8. April 27, 20269flash flood warnings
  9. June 21, 20269flash flood warnings
  10. July 11, 20269flash flood warnings
  11. July 27, 20268flash flood warnings
  12. August 19, 20267flash flood warnings

Nearby

Alerts in force nowTornadoes on recordThe radar archive2025

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. Rebuilt daily.