Flash Flood in De Kalb County, Illinois

Flash Flood August 18, 2025 · De Kalb County, Illinois

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

What the National Weather Service wrote

A report of flooding was received from northeast of Creston via mPing.

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 Malta (41.9548, -88.9263).

Source: NOAA Storm Events Database, event 1288633. Narratives are written by the National Weather Service forecast office that issued the report.

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