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.

The heavy downpours wreaked havoc across the city with footage showing commuters overwhelmed by floodwaters in various subway stations.

Watch as a subway station in New York City becomes submerged by floodwater amid heavy rainfall.Footage taken by an eyewitness onboard a carriage on Monday (14 July) shows torrents of water rushing into the platform at 28th Street Station as horrified onlookers watched on.

New York is cleaning up and trying to dry out after Monday night's torrential rains caused flash flooding and damage.

Additional dangerous flash flooding incidents are likely in the coming days as high humidity, daytime heat and storm systems interact from the Atlantic Seaboard to the Plains, Gulf coast and Southwest.

Flash floods are occurring across the U.S., from Texas to New Jersey. Here's what you should know as risks escalate.

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

Heavy rainfall flooded portions of New York and New Jersey, with videos on social media showing a subway station inundated with floodwaters.