Alert archive / Illinois / Flash Flood Warnings / 2026

Flash Flood Warnings in Illinois, July 2026

42 flash flood warnings in July 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 July 2026. Tap one for its archive.

Flash Flood Warnings
42
Busiest day
July 4, 202615 flash flood warnings

Over time

By day

Days in UTC, the clock the archive keeps.

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
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

By county

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

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. Warning verification from the Mesonet's Cow. Rebuilt daily.