Hail stones as big as tennis balls pelted some areas of New Jersey on Friday as a line of strong thunderstorms swept across the region, according to the National Weather Service. Some of the biggest hail — measured at 2.50 inches in diameter, about as big as a standard tennis ball — was found in Shamong in Burlington County, reports from weather spotters show. Hail stones as large as ping pong balls, coming in at 1.50 inches in diameter, were reported in Cherry Hill. In Cherry Hill and Marlton, weather spotters reported quarter-size hail (1 inch in diameter), and nickel-size hail (0.88 inches …