Flash Flood — Will, Illinois

2025-08-12 · near Marley, Will, Illinois

Event narrative

Multiple reports of flooded roadways came out of Mokena and Frankfort. Three separate private weather stations in the area recorded between 3.71 and 3.89 inches of rain between roughly 12:30 PM and 3 PM CST, featuring a couple of periods with rainfall rates of 2 inches per hour.

Wider weather episode

Training thunderstorms brought several rounds of torrential rainfall to portions of northeast Illinois on the 12th, especially around the interior Chicago metro area. Street flooding was reported around a number of municipalities. Nearly 500 service requests were made to the city of Chicago for water in basements. One person was also injured at Montrose Beach as lightning struck nearby.

View location on OpenStreetMap → (41.5498, -87.9093)

Source: NOAA Storm Events Database, event_id 1282627. Narrative written by the NWS forecast office that issued the report.