Forecasters warned more rain and flash flood risk is expected on July 15 after storms flooded out roads the day before.

A flash flood warning was in effect in New York City until 9:45 p.m., and New Jersey Gov. Phil Murphy declared a state of emergency. Middlesex, Morris and Somerset counties remained under a flood warning until 7:15 a.m. Tuesday.

Authorities say two people in New Jersey were killed after their vehicle was swept up in flood waters during a storm that moved across the U.S. Northeast overnight. Authorities said Tuesday

Torrential downpours battered the New York metropolitan area on Monday night, unleashing widespread flash flooding that brought transit systems to a standstill, submerged roads and highways, and disrupted air travel across several major airports.

When the train doors opened, "quite a lot of water came in, so almost all of us stood up on the seats," a passenger told Newsweek.

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.

Officials in Kerr County, Texas, met Monday as the region reels from devastating floods earlier this month — and after a new round of rain over the weekend halted the search for dozens of people still missing from the disaster.