Tropical Storm Emily formed southeast of Puerto Rico, and warnings were issued for several islands in the Caribbean, the National Weather Service said Monday.
Forecasters said the storm's track would bring it along Florida's east coast by Saturday.
The storm was about 290 miles southeast of San Juan, Puerto Rico, forecasters said. It had sustained winds of 40 mph and was moving west at 17 mph.
The weather service said a tropical storm warning was in effect for Puerto Rico and the islands of Vieques and Culebra. The government of France issued a tropical storm warning for the islands of Guadeloupe, Desirade, Les Saints and Marie Galante. The government of Barbados issued a tropical storm warning for St. Kitts, Nevis, Montserrat and Antigua.
Tropical storm watches were in effect for the U.S. Virgin Islands and Haiti.
Also on Monday, Hurricane Eugene formed over the open waters of the Pacific but remained far from the coast of Mexico. Eugene was centered about 410 miles south-southwest of Zihuatanejo, Mexico, and was moving west-northwest at 10 mph. No watches or warnings were issued.