A tornado touched down in Delaware on Monday, the National Weather Service says.
The weather service says the EF-0 tornado hit in Newark, Del., at 4:47 p.m.
Authorities surveyed storm damage this morning to determine whether the wreckage was from a tornado or straight-line winds. EF-0 is the weakest category for tornadoes.
The tornado had an estimated maximum wind speed of 80 mph and maximum width of 150 yards, the weather service said.
No one was injured, though 10 to 20 homes were damaged. Large trees blew into some homes.
Tornado watches covered much of the region, from Maryland to New Jersey, Monday afternoon and evening.
Officials had to examine the storm's path, width, strength and location before determining whether a tornado hit, meteorologist Lee Robertson said.
"They'll see what damage it did and make an assessment after that," he said this morning.
Farther south, a tornado was also reported in Maryland. The tornado touched down in Howard County in the central part of the state, the Washington Post reported.
Heavy rain fell throughout the Philadelphia on Monday. More than three inches fell in Modena in Chester County and Toms River in Ocean County. Nearly that much was reported in parts of Montgomery and Monmouth counties, according to the weather service.