A pre-Valentine’s Day winter storm expected to hit New Jersey late Monday and into Tuesday could dump 6 to 8 inches of snow across northwestern New Jersey counties with more widespread amounts of 2 to 6 inches across the northern half the state, according to the latest forecast from the National Weather Service. The weather service’s initial snow forecast map for the storm issued early Saturday has Morris, Passaic, Sussex and Warren county getting the highest snowfall totals. Up to a foot of snow is possible in the Poconos in Pennsylvania. Forecasters are now expecting “a slower and stronger s…