Monthly outdoor warning siren testing is getting underway again.

Northfield Township is advising residents that Washtenaw County's 87 warning sirens will be tested at noon on the first Saturday of every month from March through October. The first test is this Saturday at noon. Officials say if there happens to be a threat of severe weather on the day of a test, it will be cancelled. 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.

Except for scheduled testing, 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 75mph or greater, a hazardous materials accident that requires immediate protective action by the public, or if an attack on the United States is imminent, underway, or has recently occurred.

Livingston County’s siren testing begins in April and will run through October, with testing occurring the first Saturday of every month.(JM)