Isolated thunderstorms are expected to continue in northeastern New Jersey Saturday afternoon, the National Weather Service said. A slow moving cold front was expected to bring isolated strong or severe thunderstorms, the NWS said. There could also be an isolated flash flood threat. A hazardous weather outlook has been issued for Passaic, Hudson, Bergen, Essex and Union Counties. There is also a special weather statement in effect for the Morristown, Dover, and Madison area through 12:15 p.m. on Saturday, warning residents that pea-sized hail is possible. The rest of New Jersey will see season…