There’s been an abnormal amount of extreme rainfall across the United States in recent days. Here’s what’s driving it.

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

Parts of Somerset and Middlesex experienced severe flooding during Monday’s storms, necessitating dozens of water rescues in several towns. High temperatures on Wednesday will climb into the upper 80s to low 90s with a heat index in the low to mid 90s.

A large percentage of people still unaccounted for were probably visiting the area, Kerr County Judge Rob Kelly said.

Maryland residents can track flooding events through a new map created by the state's Department of Natural Resources (DNR).

The Center Valley area in Upper Saucon Township, where flooding was reported along Route 309, had a recorded 6 inches of rainfall, making it the highest rainfall total in the Lehigh Valley, according to the National Weather Service in Mount Holly, New Jersey. Other areas had about 1 or 2 inches of rain.

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

Parts of the Lehigh Valley saw torrential downpours Monday night, which led to flooding. Upper Saucon Township, Pennsylvania, was hit particularly hard. Mary Klingman has lived in Center Valley, a community within the township, for 25 years, and said she has never seen flooding to this degree.