The National Weather Service is warning residents of frequent lightning, wind gusts up to 75 mph, and hail, expected around 4 p.m. The watch is in effect through 7 p.m.
As of 7:30 p.m., the threat was over for North Jersey, however, another round of storms was moving in for South Jersey and Greater Philadelphia, the NWS said.
Showers and thunderstorms could last through midnight, the NWS said.
Sunday is muggy with a high just below 90 but temps are expected to plummet to the 60s in the evening. Monday will be sunny with a high near 81.
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