Flash Flood — Will, Illinois

2025-08-18 to 2025-08-19 · near Marley, Will, Illinois

Event narrative

Numerous reports of street flooding came out of the east side of Mokena, south of I-80. Near the Hickory Creek train station, at least 6 inches of water were flooding a viaduct. Up to 3 feet of water were reported on a roadway near Hercht Park. A nearby private weather station recorded 3.62 inches of rain from approximately 6 to 9 PM CST. Reports show flooding began in the area following an initial push of heavy rain during the 6PM CST hour, with additional flooding following subsequent storms through the evening. An estimated 200 structures were flooded around the Mokena, Frankfort, and Crete areas totaling around $1 million in flood damages.

Wider weather episode

During the afternoon and evening of the 18th, a few rounds of thunderstorms brought torrential rainfall to much of northern Illinois resulting in flash flooding. One particularly strong storm also produced damaging winds in DeKalb County. Initial reports estimate $8.8 million in flood damages around northern and northeast Illinois, and around $2.5 million in the city of Chicago alone.

View location on OpenStreetMap → (41.5522, -87.8892)

Source: NOAA Storm Events Database, event_id 1288874. Narrative written by the NWS forecast office that issued the report.