Severe · Flood WatchActive alert

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

Affecting Winnebago; Boone; McHenry; Ogle

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

Winnebago; Boone; McHenry; Ogle

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 north central and northeast Illinois, including
the following counties, in north central Illinois, Boone, Ogle and
Winnebago. In northeast Illinois, McHenry.

* WHEN...From 1 AM CDT Saturday through Saturday morning.

* IMPACTS...Creeks and streams may rise out of their banks. Roads and
streets may be flooded.

* ADDITIONAL DETAILS...
- Showers and thunderstorms overnight into Saturday morning may
produce widespread rainfall rates up to 2 inches per hour that
could lead to flash flooding.

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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