The National Weather Service has issued a flash flood warning for Lucas County until 7 a.m.
At 12:39 a.m., radar indicated thunderstorms producing very heavy rainfall with 1 to 2 inches already fallen in the last two hours and an additional 1 to 2 inches possible by 3 a.m.
Locations that might be impacted include Toledo, Sylvania, Waterville, and Whitehouse.
About 12:45 a.m., weather service radar indicated a possible tornado in Ottawa County near Clay Center, about six miles north of Elmore, that was moving northeast at 60 mph. Put-in-Bay could be in the path of a possible tornado, according to the weather service.
Tornado sirens were activated in Lucas County about 12:15 a.m., but the sheriff's office had no reports of damage as of 12:30 a.m.
In Henry County, the sheriff's office reported several barns down and roads closed at 2:20 a.m.
Barns were reported down in the southern part of the county near Holgate, Malinta, and Deshler.
Roads closed included two in the Richfield Township area between McClure and Deshler:
*County Road 2 between State Rt. 281 and County Road G.
*County Road 7 between County Road J and State Rt. 281.
Putnam County sheriff's office reported problems from the storm, but no one was thought to be injured, at 12:35 a.m.
Seneca County sheriff's office reported several trees down in the storm, including one near Kansas.
In Wood County, one of the worst reports of storm damage was a tree that fell on a house on Euler Road north of Weston.
Elsewhere in the county, a garage reportedly lost one of its sides, according to the sheriff's office.
No one was thought to be injured by storms in the county, according to the sheriff's office.
Scattered power outages in the region included some areas north of Napoleon.
The flood watch posted by the agency's Cleveland office covers Lucas, Wood, Ottawa, Sandusky, Seneca, Hancock, Wyandot, Crawford, Marion, Huron, and Erie counties as well as all of northeast Ohio.
A look at live radar from Blade media partner 13 ABC: