The National Weather Service has upgraded their New Jersey forecast for Sunday’s storm to include a gale warning and possible snow in the state’s northwestern corner A flood watch remains in effect for the entire state from Sunday at 1 p.m. through Monday at 4 p.m. New Jersey is expected to receive rainfall totaling 2-3 inches in most parts of the state and up to four inches in others. The heaviest rainfall is expected Sunday night as plummeting temperatures could turn rain into snow in certain portions of the state, including about an inch in parts of Sussex County. “A surge of cold air late …