Flash Flood — De Kalb, Illinois

2025-08-18 · near Dekalb, De Kalb, Illinois

Event narrative

A report of flooding was received from the northwest side of DeKalb via mPing.

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 → (41.9523, -88.7732)

Source: NOAA Storm Events Database, event_id 1288634. Narrative written by the NWS forecast office that issued the report.