Residents in Hatteras and Ocracoke Islands face significant flooding risks, with mandatory evacuations in place for visitors. N.C. Highway 12 may become impassable, isolating communities during emergencies. Coastal flooding, beach erosion, and high surf will affect the Outer Banks, with water levels rising 1-3 feet. Dangerous marine conditions and rip currents will extend along the East Coast, posing risks to swimmers and boaters.