Editor's note: The tornado warning has been canceled as of 6:32 p.m.
A tornado warning has been issued for northern Washtenaw County and southern Livingston County until 7 p.m. Tuesday the National Weather says.
This radar image shows the tornado warning area in red.
The warning area includes Salem Township, Whitmore Lake, Pinckney, Hamburg, Gregory and Brighton.
The weather service said an actual tornado had not been spotted, but radar had indicated rotation in the storm.
The weather service said damage to roofs, windows and vehicles is possible. Flying debris could be deadly to people and animals and tree damage is likely. Mobile homes could also be damaged or destroyed.
The weather service advised residents to take cover, move to an interior room on the lowest floor of sturdy building and avoid windows. Those in mobile homes, vehicles or outdoors were advised to move to the closest substantial shelter.
Warning sirens could be heard in Ann Arbor, Dexter and Chelsea around 6 p.m.