A line of slow moving strong thunderstorms is causing minor flooding on some south Jersey roadways.

Flash flooding at a Glassboro shopping center (Heather Hirst @hnh911 via Twitter)

The National Weather Service has extended  a Flash Flood Warning for parts of south Jersey including Camden, Gloucester and Burlington counties until 8:15 p.m.. as the storm has falling at a rate of 2 inches per hour covering roadways and as much as 4 inches in some areas according to a tweet from Gary Szatkowski of the National Weather Service.

There were concerns about the Mantua Creek in Pitman rising above flood stage because of the heavy rain.

Philadelphia International Airport was on a ground stop as heavy rain moved throuigh creating low visibility according to a tweet from the airport. FlightAware reports delays of 45-60 minutes on departures. NJ Transit's Riverline is operating with 15 minute delays due to weather.

New Jersey Fast Traffic reports Route 130 is closed due to flooding in Pennsauken between Cove Road and the Betsy Ross Bridge.

Meteorologist Alan Kasper says the rain comes from a weak front that has made for summer-like humidity and periods of heavy rain in central and south Jersey during the past two days. More heavy storms could develop overnight along with more fog. Wednesday should be slightly cooler as the front passes to the south.