Heavy rain and flooding closed multiple freeways in Michigan on Saturday.

Roadways in the Detroit metro area were "littered with abandoned vehicles" the Metro Detroit Michigan State Police tweeted.

Michigan Gov. Gretchen Whitmer declared a state of emergency for Wayne County as floodwaters rose. The Detroit News reported that Detroit was seeking federal disaster assistance after the city was inundated by more than five inches of rain.

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(MORE: Midwest Cities Blasted with Flooding Rainfall)

Gary Brown, director of the Detroit Water and Sewerage Department, said in a press conference Saturday afternoon that the city's operation system was at maximum capacity, and more than another inch of rain could lead to another backup. The system was overwhelmed earlier in the day.

"We are aware that hundreds, perhaps even thousands, of Detroiter households have experienced water in their basements and sewer backups,” Brown said.

The New York Times reported that about 50 motorists had to be rescued from the floodwaters in the Detroit metro area, and that officials counted about 350 vehicles damaged. Some cars were completely submerged.

More than 6.6 inches of rain was measured in Garden City, Michigan, according the National Weather Service (NWS).

Chicago also saw flooding Saturday, which closed down part of the Eisenhower Expressway.

Tornado sirens sounded in the city after the NWS issued a tornado warning, but a tornado did not occur.

Southwestern Missouri was under a flash flood emergency after the city of Seneca saw more than eight inches of rainfall.

The rain isn't over, either. The NWS forecasts rainfall across metro Detroit through next Friday.

The Weather Company’s primary journalistic mission is to report on breaking weather news, the environment and the importance of science to our lives. This story does not necessarily represent the position of our parent company, IBM.