Severe · Flood WatchActive alert

Flood Watch issued September 18 at 1:47PM CDT until September 19 at

Affecting Lake; Lee; De Kalb; Kane; DuPage; Kendall; Northern Cook; Central Cook; Southern Cook; Northern Will; Lake; Porter

In effect until: Sep 19, 2026, 4:15 AM

Lake; Lee; De Kalb; Kane; DuPage; Kendall; Northern Cook; Central Cook; Southern Cook; Northern Will; Lake; Porter

Possible impact zone; conditions develop through 4:15 AM.

Avoid flooded areas. Move to higher ground if water is rising near you.

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Read the original bulletin (official text)

* WHAT...Flash flooding caused by excessive rainfall is possible.

* WHERE...Portions of Illinois, including the following areas, Cook,
De Kalb, DuPage, Kane, Kendall, Lake, Lee, and Northern Will and
northwest Indiana, including the following areas, Lake and Porter.

* WHEN...From late tonight through Saturday morning.

* IMPACTS...Creeks and streams may rise out of their banks. Flooding
may occur in poor drainage and urban areas. Roads and streets may
be flooded.

* ADDITIONAL DETAILS...
- Showers and thunderstorms late tonight through Saturday morning
may produce widespread rainfall rates up to 2 inches per hour
that could lead to flash flooding, particularly over urban areas.

Additional thunderstorms Saturday evening into early Sunday
morning have the potential to produce torrential rainfall that
results in flash flooding, though the exact placement of this
rainfall remains unclear. A second Flood Watch for flash flooding
may be needed during this period.
- http://www.weather.gov/safety/flood

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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™

Flood Watch issued September 18 at 1:47PM CDT until September 19 at

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