The National Weather Service expanded winter weather advisories to now include 18 New Jersey counties, meaning a majority of the state can expect at least 2 to 3 inches of snow during Sunday’s storm system. Mercer, Middlesex, Hunterdon, Morris, Somerset, Sussex, and Warren were the latest counties added to the winter weather advisory, which lasts in those areas until 1 p.m. Snow is already starting to fall in the many parts of the state. How much snow will you get Sunday? Check our map for snowfall totals for any town.Advisories in Atlantic, Burlington, Camden, Cumberland, Gloucester, Monmouth…