PHILADELPHIA - Spotty rain showers on Thursday morning will serve as a precursor to heavier downpours and thunderstorms during the afternoon and evening as a storm system is set to rumble across the Delaware Valley.Scattered showers will move across parts of southeastern Pennsylvania and southern New Jersey with heavy downpours at times.
Winds from the southwest will help keep conditions muggy with temperatures in the mind-to-upper 70s.Forecasters expect a large system of rain with a band of strong thunderstorms to impact areas north and west of Philadelphia around 3 p.m.