We have a chance of isolated strong, possibly severe, storms this afternoon through midnight, with an associated slight risk of damaging wind or large hail. Little-to-no tornado risk.
These storms could develop as a cold front moves slowly through SE Michigan from north to south. Any storms that do develop will probably be powerful.
I wouldn’t worry just yet, but as it gets even hotter this afternoon and the front moves through the area some storms will develop across the area. It’s impossible to predict to what extent any will affect Ann Arbor specifically.
NWS Detroit hazardous weather outlook:
THERE IS A SLIGHT CHANCE OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EARLY TONIGHT AS A COLD FRONT SLOWLY MOVES THROUGH THE AREA FROM NORTH TO SOUTH. ANY STORMS THAT DEVELOP WILL BE CAPABLE OF PRODUCING WIND GUSTS TO 60 MPH AND HAIL UP TO ONE INCH IN DIAMETER. STORM MOTION WILL BE NORTHWEST TO SOUTHEAST AT 30 MPH.
Washtenaw County Emergency Operations Center:
ISOLATED SEVERE THUNDERSTORMS WITH 60 MPH WINDS AND ONE INCH HAIL ARE POSSIBLE BETWEEN 2 PM AND MIDNIGHT.