Severe · Flood WatchActive alert
Flood Watch issued September 20 at 1:33AM CDT until September 20 at
Affecting Winnebago; Boone; McHenry; Lake; Ogle; Lee; De Kalb; Kane; DuPage; La Salle; Kendall; Grundy; Kankakee; Northern Cook; Central Cook; Southern Cook; Northern Will; Southern Will; Eastern Will; Lake; Porter
In effect until: Sep 20, 2026, 2:45 PM
Winnebago; Boone; McHenry; Lake; Ogle; Lee; De Kalb; Kane; DuPage; La Salle; Kendall; Grundy; Kankakee; Northern Cook; Central Cook; Southern Cook; Northern Will; Southern Will; Eastern Will; Lake; Porter
Possible impact zone; conditions develop through 2:45 PM.
Avoid flooded areas. Move to higher ground if water is rising near you.
Read the original bulletin (official text)
* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of Illinois, including the following areas, Boone, Central Cook, De Kalb, DuPage, Eastern Will, Grundy, Kane, Kankakee, Kendall, La Salle, Lake IL, Lee, McHenry, Northern Cook, Northern Will, Ogle, Southern Cook, Southern Will and Winnebago and northwest Indiana, including the following areas, Lake IN and Porter. * WHEN...Until 1 PM CDT this afternoon. * IMPACTS...Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Underpasses may be flooded. Roads and streets may be flooded. Basement flooding may occur. * ADDITIONAL DETAILS... - Periods of showers and thunderstorms are expected through midday. Swaths of torrential rain with 2 inch per hour rainfall rates, or higher are likely to occur within the watch area and may result in areas of flash flooding and cause rapid rises on area rivers, creeks, and streams. - http://www.weather.gov/safety/flood
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™