Heavy rains and flooding brought havoc to the Chicago area Thursday, shutting major expressways, delaying commuter trains for hours, canceling flights, flooding basements and closing dozens of suburban schools.

The National Weather Service issued flash flood warnings for the entire Chicago area. Between three and seven inches of rain fell throughout the area within 24 hours and lighter rain was expected later Thursday, according to the weather service.

On the city’s South Side, a sinkhole opened on a residential street, swallowing three cars, according to officer Mike Sullivan of the Chicago Police Department. One person was hospitalized with injuries that were not life-threatening.

Flooding shut down parts of the Kennedy, Edens and Eisenhower Expressways on Thursday morning, according to Illinois State Police.

O’Hare International Airport reported 500 flight cancellations and delays of more than 90 minutes for incoming and outgoing flights. Midway International Airport reported more than 30 cancellations and 30-minute delays.

Illinois Gov. Pat Quinn declared a state of emergency for the state and urged residents of flooded areas to stay off the roads.

“There are all kinds of things going on, lots of flooded basements, flooded streets and viaducts,” said Chicago Fire Department Chief Kevin MacGregor.

Brookfield Zoo, just west of Chicago, closed for only the third time in its 79-year history due to the weather.

The ComEd electric utility reported 21,000 Chicago-area customers without power.

The stormy weather was also affecting other parts of the country, including West, Tex., where emergency workers were responding to a fatal explosion at a fertilizer facility. AccuWeather reported that heavy rain was sweeping into the area, with wind gusts of up to 45 miles per hour.

A moderate risk of severe thunderstorms was predicted into the evening on Thursday for parts of Mississippi, Arkansas, Tennessee, Kentucky, Illinois and Indiana, according to the weather service’s Storm Prediction Center.

A spokesman for Metra, the Chicago commuter rail service, said three Union Pacific Lines suffered severe delays due to a loss of power at a “complex set of switches” outside a major downtown train station after a lightning strike.

Power has been restored, but trains were getting through at “much slower rates than normal,” spokesman Tom Miller said.

Passengers on their morning commute waited for up to two hours on trains backed up in the pouring rain.

Officials in the Chicago western suburbs of Lombard, Schiller Park and Elmhurst and the Lake County north of Chicago have declared states of emergency due to the flooding and urged residents to stay off the roads.

Quinn traveled to Elmhurst on Thursday afternoon to survey the damage.

“Our experts at the Illinois Department of Natural Resources are very concerned about the next few days, that certain rivers in our state are at record levels with respect to flooding that we’ve never seen before,” Quinn said at a news conference.

High water was reported on the Fox and Des Plaines Rivers.

The Fox River was expected to reach 15.5 feet above flood level Thursday in the town of Montgomery, 55 miles from Chicago, beating the record of 15.12 feet in 2008, National Weather Service meteorologist Amy Seeley said. The Des Plaines River in Lake County was expected to reach 10.5 feet, near the record of 11.09 feet in 2004, Seeley said.

A multi-car accident on I-294 in Cook County resulted in the deaths of two people early Thursday morning, according to Illinois State Police. It was not immediately known whether the accident, which involved a truck semi-trailer and five cars, was weather-related, but it had been raining heavily at the time.

Seeley said the amount of rain was “unusual” for the Chicago area, even for usually rainy April.

The weather was clearing up Thursday afternoon, with light rains predicted the rest of the day and on Friday, Seeley said.

— Reuters