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

More than 50 million Americans throughout the Northeast are under flood watches on Monday, with a significant risk of flash flooding in some areas.Flash flood warnings have been issued for cities including New York City,

Flash flood warnings were issued by the National Weather service Monday night as heavy storms rolled into the area. Flood warnings were issued for Morris, Warren, Bergen, Essex, Hunterdon, Hudson, Passaic, Middlesex, Somerset and Union Counties, according to the National Weather Service.