MIAMI (AP) — Hurricane Bertha strengthened to a Category 3 storm Monday as it swirled in the central Atlantic, but it posed no immediate threat to land.

Forecasters expect the Atlantic season's first hurricane to head toward Bermuda. It was too early to tell whether the storm would hit the island, but residents were urged to monitor Bertha's progress.

At 11 p.m. Monday, the hurricane was located 695 miles east-northeast of the Northern Leeward Islands and about 1,085 miles southeast of Bermuda. It was moving west-northwest at about 12 mph. Maximum sustained winds were measured near 120 mph.