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.

Several NYC subway stations flooded on Monday night after rain drenched parts of the city, causing severe delays and even closures.

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.

NYC could be in play for another heat wave this week, with the potential for more heavy rain, storms and flash flooding due to the hot and humid conditions.

Heavy rain inundated the region with flash flooding that stranded vehicles in roadways, closed subway lines and led to the declaration of states of emergency.

Atlantic, Hill Country, Texas, central Florida, southern Arizona, and the Upper Midwest are at risk for more flooding rainfall on Tuesday.

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

Flooding can be deadly and often strikes with little or no warning. Streets, basements, and below-grade spaces can fill with water in minutes. If you live in a basement apartment or