Storms prompted flash flood warnings across the New York City metropolitan area Monday night, with photos showing severe flooding across the city and in parts of New York state and New Jersey.

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

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

A flood watch has also been issued in Washington, D.C., while the Midwest also has the potential for flooding.

A state of emergency was declared in New Jersey after slow-moving thunderstorms unloaded a significant amount of rain, resulting in dangerous flash flooding across the Northeast into Monday night. At least 2 were killed.

The state is now suing to restore $351 million in funding for projects aimed to upgrade drainage and protect public housing from flooding.

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.

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