Hurricane Erin prompted beach closures from New York to Delaware, with rip-current warnings and high waves.
North Carolina’s Outer Banks face the greatest threat, with evacuations and storm surges up to 15 feet.
Erin, a Category 2 storm with 100 mph winds, previously hit the Bahamas and Turks and Caicos.
Experts warn warmer oceans make Atlantic hurricanes like Erin more likely to intensify rapidly.