Flooding caused delays on multiple New York City subway lines Monday as torrential rain pummeled the Tri-State Area.

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.

The subway system, which is more than a century old, is relied on by millions of passengers every day and weaves the city into a cohesive network.

Much of the U.S., including North Carolina, has experienced a significant increase in intense rainfall and widespread flooding throughout July, often unrelated to tropical systems and impacting areas outside designated floodplains.

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. Heavy rain moved through the region Monday,

High humidity and scorching summer heat will lead to the risk of severe storms and ongoing flash flooding events in the coming days. It will be hazy and hot on Wednesday, July 16, and Thursday, July 17,

The heat advisory includes parts of Delaware, Pennsylvania, New York, Connecticut and New Jersey, where two people died in flooding.

Transit agencies in the New York City area were promising a fairly smooth commute with some lingering delays on Tuesday, the morning after heavy rain pummeled the region, flooding parts of the subway system, inundating major roads and causing long flight delays.