The Washtenaw County Emergency Operations Center will be conducting a test of 90 outdoor warning sirens, including those in Chelsea, on May 2, 2026 at 12:00 Noon. These sirens are tested at Noon on the first Saturday of every month from March through October.
If there is a threat of severe weather on the day of a test, it will be cancelled. Except for scheduled testing, the sirens will be activated for the following emergencies:
- The National Weather Service has issued a tornado warning.
- A severe thunderstorm has been detected with damaging winds of 75 MPH or greater.
- A hazardous materials accident or other local emergency requires immediate protective action by the public.
- An attack on the United States is imminent, underway or has recently occurred.
Warning siren activation is a signal to members of the public to immediately go indoors and monitor local Emergency Alert System media outlets for official information. Washtenaw County’s emergency broadcasters are:
WEMU 89.1 FM
WWWW 102.9 FM
WQKL 107.1 FM
WTKA 1050 AM
WLBY 1290 AM
-WCSO Emergency Services Division
