New York City’s subway system is mainly known for moving millions of riders every day and scaring the U.S. transportation secretary. But every so often it also becomes the world’s least-popular water park.

Heavy rains and flash flooding in the northeast have caused two deaths in New Jersey. More rain is expected through mid-week for portions of the eastern and central U.S.

Waters rushed into subway stations, making for hellish commutes, and the flash floods killed two people in New Jersey and caused a house to explode in New Jersey. Climate experts expect flooding to worsen and threaten already-struggling infrastructure throughout the region.

New Jersey is under a state of emergency after a flash flood caused at least two deaths in Plainfield and damage across Union County.

Roads and streets, meanwhile, are likely to flood during the downpour, said the Office of Emergency Management’s advisory. Flooded roads could spell trouble for the city’s bus riders and drivers. The city warned motorists not to drive through flooded roads.