Flash flood watch in effect until midnight, some area roads already closed due to flooding

The National Weather Service in Mount Holly has issued a flash flood watch for Mercer, Hunterdon, Middlesex, Somerset, and Monmouth counties in New Jersey and Upper Bucks County in Pennsylvania until midnight.

Slow-moving showers and thunderstorms are expected in the region until Thursday evening. Heavy downpours are anticipated. Rainfall amounts as high as two to four inches are possible in a short amount of time, according to the National Weather Service.

The ground still remains saturated from previous storms, and streams and creeks are running high. As a result, much of the area is more susceptible to flooding than usual. The heavy rain will result in flooding of roadways and areas of poor drainage, as well as small streams and creeks.

As of about 8 a.m. on Thursday, Quaker Road was already closed due to flooding. Rosedale Road is also closed due to flooding. A reader reported that Route 206 near the Hun School in Princeton was flooding just after 8 a.m. Avoid Mapleton Road in Plainsboro due to a downed tree in the road.

We will update this story with other road closures as they occur. Email road closure tips to editor@planetprinceton.com.