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

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

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.

Torrential downpours battered the New York metropolitan area on Monday night, unleashing widespread flash flooding that brought transit systems to a standstill, submerged roads and highways, and disrupted air travel across several major airports.

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

Severe flash flooding struck New York City, Westchester County, Staten Island, and Rockland County, Bergen, Essex, Hudson, Passaic

While FEMA has improved the accuracy and accessibility of the maps over time with better data, digital tools and community input, the maps still don't capture everything.