The storm left thousands of Pepco and BGE customers in Montgomery and Prince George's counties without power as of Saturday night.
Rescue officials in Montgomery County said several vehicle crashes sent dozens to hospitals with non-life threatening injuries. The majority of the collisions were on interstates 270 and 495, according to a statement from Pete Piringer, a spokesman for Montgomery County Fire and Rescue Services.
About 50 roads were closed in the county due to flooding, downed trees and power lines, he said.
No further information was available.
The heaviest rains in the state fell in southern Montgomery County, according to Chief Meteorologist Mark Hoekzema of Germantown-based Weatherbug.
"Outside of a good soaking, which actually I think we really needed, I think the storm was fairly benign for the potential that it had a few days ago," he said. "A few days ago we were looking at a potential hurricane coming in."
Rainfall totals in Montgomery County ranged from two to four inches, with more than five inches recorded in Rockville and Potomac. Wind gusts in the county were below 40 miles per hour, he said, except for the company headquarters, where gusts were more than 40 mph.