Heavy Rain — Boone, Illinois

2025-08-18 · near Blaine, Boone, Illinois

Event narrative

A private weather station recorded 5.75 of rain through 7 PM CST, most of which would have fallen since 5:30 PM CST.

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 → (42.4700, -88.7300)

Source: NOAA Storm Events Database, event_id 1288878. Narrative written by the NWS forecast office that issued the report.