NEW YORK — A flood watch is in effect across the New York City area from Sunday afternoon into early Monday morning, as forecasters say a powerful storm could dump up to 3 inches of rain in the region. Most of the rain will fall during a 12-hour period starting in the early evening on Sunday, officials with the National Weather Service in New York said in a briefing Friday night. All five boroughs are under a flood watch from 4 p.m. Sunday until 6 a.m. Monday, while a high wind watch — with sustained winds of 30 to 40 mph and gusts up to 60 mph — is also in effect for Brooklyn and Queens durin…