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The Washtenaw County Emergency Operations Center will be conducting a test of 81 outdoor warning sirens at 12:00pm on the first Saturday of every month March - October. If there is a threat of severe weather on the day of a test, the test will be cancelled.


Except for scheduled testing, the sirens will be activated for the following emergencies:

1. The National Weather Service has issued a tornado warning.

2. A severe thunderstorm has been detected with damaging winds in excess of 70 MPH.

3. A hazardous materials accident requires immediate protective action by the public.

4. 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


This test does not include sirens within the City of Ann Arbor. Ann Arbor's sirens are tested on the second Tuesday of every month at 1:00pm.

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Charter Township of Ypsilanti  •  7200 S. Huron River Dr. Ypsilanti, Mi 48197  •  (734) 544 - 4000

Mon. - Fri., 8:30am - 4:30pm  •  Closed 12:00pm - 1:00pm daily