NYC came to a grinding halt on Thursday as torrential rains and hurricane-force winds battered the city, flooding streets, subway lines and homes across all five boroughs. The National Weather Service issued a flash flood emergency as more than 6 inches of rain fell within hours, submerging vehicles, cutting power to neighborhoods and turning basements into death traps. The FDNY confirmed two fatalities, one in Brooklyn and another in Washington Heights, as rescue teams struggled to reach trapped residents amid rising waters. WATCH