Tropical Storm Gustav closed in on Jamaica Thursday at near-hurricane strength while Tropical Storm Hanna formed in the Atlantic.

Hanna, the eighth named storm of the 2008 hurricane season, is spinning about 1,500 miles east-southeast of Miami with 40 mph winds. Forecasters said Hanna could grow into a hurricane by Labor Day but likely wouldn't threaten the U.S. coast until later next week, if at all.

Meanwhile, Gustav's winds increased to 70 mph from 45 mph overnight as it took a turn toward Jamaica. The center of Gustav was moving over the island's eastern shoreline at 2 p.m., about 40 miles east of Kingston.