National Weather Service: 

Overview:

A slow moving cold front will approach from the north into tonight and then remain nearby Monday into Monday night before shifting south on Tuesday.

There is a chance of showers and thunderstorms this afternoon and evening, mainly from the New York City metro on north and west. Locally heavy rainfall is possible.

More widespread showers with possible thunderstorms are expected Monday afternoon into Tuesday. The showers could be heavy at times and could train over the same areas. The NWS Weather Prediction Center has placed the region in a slight risk for excessive rainfall for this time period.

Timing: Monday afternoon into early Tuesday morning

Locations: The entire Tri-State area

Impacts: Mainly localized flash flooding of most vulnerable urbanized areas.