New York and New Jersey hit by torrential rain and flash floods, forcing highway closures, suspending subway lines and flight delays.

Torrential rain on Monday night triggered flash flooding that stranded vehicles in roadways across the Tri-State, closed subway lines in New York City and led to a state of emergency in New Jersey.

At least two people have died due to flash flooding in New Jersey after parts of the northeastern U.S. and mid-Atlantic were inundated with heavy rain Monday night. The storm caused flash flooding ...