Alert archive / Illinois / River Flood Watches

River Flood Watches in Illinois, 2026

62 river flood watches 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 river flood watches reaches back to 2005.

River Flood Watches by county

Each county as a circle sized by its count in 2026. Tap one for its archive.

River Flood Watches
62
Busiest month
April39 river flood watches
Busiest day
April 15, 202620 river flood watches

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
Apr 2, 4:36 AM CDTRiver Flood WatchLOTBureau, LaSalle, Putnam31 hr
Apr 2, 9:59 AM CDTRiver Flood WatchLOTCook15 hr
Apr 2, 9:59 AM CDTRiver Flood WatchLOTLaSalle15 hr
Apr 2, 10:25 AM CDTRiver Flood WatchLOTWinnebago29 hr
Apr 2, 11:46 AM CDTRiver Flood WatchMKXLake24 hr
Apr 4, 11:29 AM CDTRiver Flood WatchLOTCook, Lake57 hr
Apr 5, 9:01 PM CDTRiver Flood WatchLOTKane, Lake, McHenry23 hr
Apr 9, 9:45 AM CDTRiver Flood WatchLOTCook, Lake24 hr
Apr 10, 4:44 AM CDTRiver Flood WatchMKXLake29 hr
Apr 10, 11:38 AM CDTRiver Flood WatchDVNHancock, Henderson6 days
Apr 10, 11:38 AM CDTRiver Flood WatchDVNHenderson7 days
Apr 14, 12:19 PM CDTRiver Flood WatchMKXLake23 hr
Apr 14, 8:26 PM CDTRiver Flood WatchDVNHenry, Rock Island, Whiteside6 days
Apr 14, 10:33 PM CDTRiver Flood WatchLOTLake6 hr
Apr 14, 10:37 PM CDTRiver Flood WatchLOTBureau, LaSalle, Putnam21 days
Apr 15, 12:24 AM CDTRiver Flood WatchLOTCook21 days
Apr 15, 12:24 AM CDTRiver Flood WatchLOTCook, Lake21 days
Apr 15, 12:24 AM CDTRiver Flood WatchLOTLake6 hr
Apr 15, 4:23 AM CDTRiver Flood WatchMKXWinnebago21 days
Apr 15, 10:32 AM CDTRiver Flood WatchLOTCook26 hr
Apr 15, 10:32 AM CDTRiver Flood WatchLOTCook12 hr
Apr 15, 10:43 AM CDTRiver Flood WatchLOTLaSalle11 hr
Apr 15, 11:21 AM CDTRiver Flood WatchDVNHancock21 days
Apr 15, 11:21 AM CDTRiver Flood WatchDVNMercer21 days
Apr 15, 11:21 AM CDTRiver Flood WatchDVNHenderson, Mercer21 days
Apr 15, 11:42 AM CDTRiver Flood WatchLOTWinnebago20 hr
Apr 15, 11:42 AM CDTRiver Flood WatchLOTWinnebago23 hr
Apr 15, 11:42 AM CDTRiver Flood WatchLOTOgle, Winnebago24 hr
Apr 15, 11:52 AM CDTRiver Flood WatchLOTWinnebago24 hr
Apr 15, 11:52 AM CDTRiver Flood WatchLOTBoone, Winnebago20 hr
Apr 15, 12:31 PM CDTRiver Flood WatchDVNHenry, Rock Island21 days
Apr 15, 12:31 PM CDTRiver Flood WatchDVNWhiteside5 days
Apr 15, 9:26 PM CDTRiver Flood WatchDVNMercer, Rock Island21 days
Apr 16, 11:30 AM CDTRiver Flood WatchDVNJo Daviess21 days
Apr 17, 1:46 PM CDTRiver Flood WatchLOTLaSalle16 hr
Apr 17, 10:57 PM CDTRiver Flood WatchLOTWinnebago36 hr
Apr 18, 11:22 AM CDTRiver Flood WatchDVNRock Island, Whiteside58 hr
Apr 18, 1:45 PM CDTRiver Flood WatchLOTLee, Ogle32 hr
Apr 26, 8:36 PM CDTRiver Flood WatchLOTBureau, LaSalle, Putnam38 hr
Jun 11, 9:36 AM CDTRiver Flood WatchDVNHenry11 hr
Jun 12, 11:07 AM CDTRiver Flood WatchLOTLivingston8 hr
Jun 20, 6:43 PM CDTRiver Flood WatchDVNHancock, McDonough19 hr
Aug 14, 9:29 AM CDTRiver Flood WatchDVNHancock, McDonough22 hr
Sep 19, 9:38 AM CDTRiver Flood WatchLOTLake21 days
Sep 19, 9:38 AM CDTRiver Flood WatchLOTLake49 hr
Sep 19, 9:38 AM CDTRiver Flood WatchLOTCook21 days
Sep 19, 9:38 AM CDTRiver Flood WatchLOTCook69 hr
Sep 19, 9:38 AM CDTRiver Flood WatchLOTCook, Lake21 days
Sep 19, 9:41 AM CDTRiver Flood WatchDVNHenry, Rock Island, Whiteside6 days
Sep 19, 9:41 AM CDTRiver Flood WatchDVNHenry, Rock Island5 days
Sep 19, 12:27 PM CDTRiver Flood WatchMKXWinnebago22 hr
Sep 19, 12:27 PM CDTRiver Flood WatchMKXLake22 hr
Sep 19, 10:06 PM CDTRiver Flood WatchLOTWill23 hr
Sep 19, 10:12 PM CDTRiver Flood WatchDVNRock Island4 days
Sep 19, 10:12 PM CDTRiver Flood WatchDVNMercer, Rock Island5 days
Sep 19, 10:12 PM CDTRiver Flood WatchDVNMercer6 days
Sep 19, 10:12 PM CDTRiver Flood WatchDVNHenderson, Mercer6 days
Sep 19, 10:12 PM CDTRiver Flood WatchDVNHenderson7 days
Sep 19, 10:12 PM CDTRiver Flood WatchDVNRock Island5 days
Sep 19, 10:12 PM CDTRiver Flood WatchDVNHancock, Henderson6 days
Sep 19, 10:12 PM CDTRiver Flood WatchDVNHancock71 hr
Sep 20, 10:20 AM CDTRiver Flood WatchLOTBureau, LaSalle, Putnam25 hr

By county

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

The busiest days

Days with the most alerts issued, by UTC date.

  1. April 15, 202620river flood watches
  2. September 20, 202610river flood watches
  3. September 19, 20269river flood watches
  4. April 2, 20265river flood watches
  5. April 10, 20263river flood watches
  6. April 18, 20263river flood watches
  7. April 16, 20262river flood watches
  8. April 4, 20261river flood watches
  9. April 6, 20261river flood watches
  10. April 9, 20261river flood watches
  11. April 14, 20261river flood watches
  12. April 17, 20261river flood watches

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.