A roof was blown off a Dundalk apartment building; a driver had to be rescued from an SUV, and non-working traffic signals and downed trees and wires were reported during the storms, Baltimore County police said.
Halethorpe in the southwestern part of the county, police said. In the 1900 block of Halethorpe Avenue, fire crews had to rescue a driver from an SUV around 8:30 p.m., police said.
However, no injuries had been reported by Thursday night.
The National Weather Service issued a flash flood warning which is in effect until 11:15 p.m. for the county, as well as southern Baltimore city, northeastern Anne Arundel and central Howard counties.
The Weather Service also issued flash flood warnings in Anne Arundel, Carroll, Harford, Howard and Baltimore counties to last through late Friday night.
Just after 10 p.m. Thursday, the weather service reported between one and two inches of rain in different areas in the Baltimore region. Dundalk saw 1.55 inches of rain while in northern Harford County, Whiteford reported 2 inches of rain within 30 minutes, said Carrie Suffern, a National Weather Service meteorologist.
More than 13,000 Baltimore Gas & Electric customers lost power in several counties, but Baltimore city and county had the highest number of outages. As of 10 p.m., the city had more than 7,000 city residents without power and Baltimore County had close to 6,000.
Friday's forecast calls for showers and thunderstorms after 9 a.m., which could produce between three quarters and one inch of rain, according to the National Weather Service website.
Suffern said it would "be the same thing tomorrow, but more widespread" from central Maryland to Washington and Northern Virginia.