Overview
- Early Tuesday morning residents from Downers Grove to Wheaton reported tornado sirens blaring shortly after 3 a.m., and local officials later confirmed the warnings were a false alarm.
- DuPage Public Safety Communications said a staff member accidentally triggered the countywide siren activation while running a system test and deactivated the warning once the error was found.
- Officials emphasized there was no severe-weather threat and that the National Weather Service did not issue or trigger any alerts for the event.
- The county completed an upgrade in May 2025 to allow faster, automated siren activation based on National Weather Service warnings, and the accidental test has raised questions about human controls and automated triggers.
- Residents expressed alarm on social media and officials have promised a fuller explanation after an internal review, a step that will affect public trust and how people respond to future real warnings.