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

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

Several historic and deadly flash flooding events have occurred in the U.S. just within the month of July alone. Experts talk about what factors are increasing the risks.

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.

Severe flash flooding across the tri-state area on Monday caused major subway delays and road closures across the Big Apple and pushed New Jersey to declare a state of emergency. All five boroughs and Nassau County were under a flash flood warning through midnight, according to the National Weather Service.

New York City’s subway system is mainly known for moving millions of riders every day and scaring the U.S. transportation secretary. But every so often it also becomes the world’s least-popular water park.

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.

Hundreds of New Jersey homes were damaged by flooding Monday​, and many families are just beginning the process of filing insurance claims.