From ABC News.

Torrential rain pummeled parts of the Northeast on Thursday, including New York City and New Jersey, stranding rush-hours passengers on a train stuck in floodwaters and inundating some roadways.

Ahead of the storm states of emergencies were declared in New York City and New Jersey, and crews were expected to continue cleaning up from the deluge into Friday.

Flash flooding also struck Philadelphia, parts of the Washington, D.C., area and Maryland, where a person was caught in rising floodwaters and then became trapped in a storm drain and died, police in Mt. Airy, Maryland, said. Police have not provided an age of the person who died.