A flash flood warning was in effect in New York City until 9:45 p.m., and New Jersey Gov. Phil Murphy declared a state of emergency. Middlesex, Morris and Somerset counties remained under a flood warning until 7:15 a.m. Tuesday.

Parts of New York City and Northern New Jersey were inundated on Monday night as widespread thunderstorms moved through.

Other Counties: Earlier warnings covered Bergen, Essex, Hudson, Passaic, and Union counties until 8:15 PM EDT, impacting Newark, Elizabeth, and Plainfield. Hunterdon, Somerset, and Middlesex counties faced warnings until 10:30 PM EDT, including Somerville and Franklin Park.

Flooding is causing problems on multiple New York City subway lines as torrential rain pummels the Tri-State Area.

Forecasters say some thunderstorm cells have the potential to dump as much as 2 to 3 inches of rain in one hour, posing a risk of rapid flooding.

A powerful round of thunderstorms is expected to hit New Jersey and eastern Pennsylvania beginning Monday afternoon, July 14, with the National Weather Service warning of flash flooding, possible power outages,

A tornado warning is in effect until 9:15 p.m. in New Castle County, Delaware.