Heavy Rain in Boone County, Illinois

Heavy Rain August 18, 2025 · Boone County, Illinois

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

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

The wider storm

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.

Began near Blaine (42.4700, -88.7300).

Source: NOAA Storm Events Database, event 1288878. Narratives are written by the National Weather Service forecast office that issued the report.

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