The Big Apple could be underwater as the work week begins, with an intense nor’easter expected to sock the city this weekend with significant rain and strong winds. Forecasters say the storm could dump between 1.5 to 3 inches of precipitation throughout the five boroughs beginning Sunday night and continuing into Monday — but officials are warning the total amounts could be much higher. “The combination of persistent, strong onshore winds, high surf and high astronomical tides may lead to some