Hurricane Cristobal is expected to move rapidly toward the north Atlantic, staying away from Bermuda and passing south of Nova Scotia.
The hurricane's maximum sustained winds early Thursday are near 75 mph (120 kph) with no significant change in strength forecast over the next two days.
The U.S. National Hurricane Center says Cristobal is centered about 285 miles (460 kilometers) northwest of Bermuda and is moving northeast near 29 mph (46 kph).
Swells generated by Cristobal are affecting Bermuda and parts of the U.S. East Coast from North Carolina to Long Island in New York. The swells are likely to cause life-threatening surf and rip current conditions.