There were no reports of damage from the winds, and tornado warnings throughout the state were canceled Monday evening, said Matt Mosteiko, a meteorologist with the National Weather Service in White Lake Township. The warnings had been issued for Livingston, Washtenaw, Wayne and Monroe counties.
"We had three-quarters-of-an-inch hail in Howell, but the main threat is flooding," Mosteiko said. "We've had a lot of reports of flooding in Wayne, northern Oakland and southern Genesee counties."
Public school officials in Ann Arbor kept students and staff inside buildings until the warning expired.
Three eighth-graders at a West Michigan school were injured after the building was struck by lightning Monday morning. Nine students, in all, were shocked at Grattan Academy in Greenville.
Two girls were standing by their lockers and suffered burns on their backs. A third girl was standing near a bathroom sink and later reported tingling and numbness in her arms.
The other six students didn't seek medical help.
It wasn't immediately clear what part of the school was hit by lightning.
Utility crews also worked late Monday to return electricity to customers in a number of communities.