Flood Advisory issued September 20 at 4:30AM CDT until September 20 at 8:00AM CDT by NWS Chicago IL
Issue date: 2026-09-20T09:30+00:00
* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Boone County in north central Illinois... Winnebago County in north central Illinois... McHenry County in northeastern Illinois... * WHEN...Until 800 AM CDT. * 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... - At 428 AM CDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Up to 1 inch of rain has fallen. - Additional rainfall amounts of 1 to 2 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Rockford, Crystal Lake, Algonquin, Lake in the Hills, McHenry, Belvidere, Woodstock, Huntley, Loves Park, Machesney Park, Roscoe, Fox Lake, Harvard, Island Lake, South Beloit, Rockton, Marengo, Poplar Grove, Rockford Airport, Cary, Johnsburg, Lakemoor, Spring Grove and Candlewick Lake. - http://www.weather.gov/safety/flood
