Powerful rains flooded Chicago streets Sunday, trapping vehicles and forcing NASCAR officials to call the Xfinity Series race scheduled to run through the city’s downtown.

The National Weather Service reported that some areas had received over seven inches of rain and several roadways remained flooded. The Illinois State Police said portions of Interstate 55 and Interstate 290 have been closed because of flooding, with at least 10 cars trapped in water on Interstate 55, WLS-TV reported.

Trains had also stopped in some parts of the city.

NASCAR officials had planned to complete the last half of an Xfinity Series race Sunday morning after it was canceled Saturday due to lightning. But heavy rain Sunday caused officials to cancel the race and declare Cole Custer the winner.

Meanwhile, more than 110 million Americans are under hazardous weather alerts as severe thunderstorms and dangerous heat levels persist across the country, weather forecasters warned this weekend. Parts of the South, Midwest, and East Coast remained under severe thunderstorm alerts Sunday after several days of extreme weather conditions.

Since Thursday, nearly 700 incidents of damaging winds have been reported in the central, southern, and eastern United States, according to the National Oceanic and Atmospheric Administration.

“DO NOT drive or walk across flooded roads,” the weather service in Chicago tweeted. The weather service also warned that the flooding could be “life-threatening” due to multiple impassable roads, overflowing creeks and streams, and flooded basements.

Threats of thunderstorms, hail, tornadoes

The threat of dangerous and severe thunderstorms will extend across parts of the Midwest and South, from Tennessee to New Jersey, according to AccuWeather.