New York City has issued a flood watch as thunderstorms develop along the East Coast, expecting heavy rain to move in overnight. Residents in New York and New Jersey are urged to prepare for potential flash floods this weekend, with officials opening 51 overnight shelters in anticipation of severe weather. The National Weather Service warns of storms across the Tri-State Area, with particularly heavy rain expected on Long Island Sunday morning. Forecasts indicate that while Saturday night may be soggy, conditions could improve with sun and clouds on Sunday afternoon. However, the threat of showers remains, and residents are advised to stay alert for possible flooding and travel disruptions.