Tropical Storm Harvey will avoid South Florida as it churns through the eastern Caribbean Sea this weekend, but forecasters are eyeing another tropical disturbance that may develop early next week.

The National Hurricane Center said early Friday that a wave currently tracking toward the Bahamas and South Florida had a high 70 percent chance of developing into a tropical depression or storm.

The system, about 750 miles east-northeast of the Leeward Islands, is tracking west-northwest at about 20 miles an hour, but faces increasing wind shear that could hinder its strengthening. Computer models project the wave, whether it develops or not, could skirt north of Puerto Rico and Hispaniola over the weekend and approach the Bahamas and potentially South Florida early next week. Those track forecasts also could change in the coming days.

Advisories also were posted as Tropical Storm Harvey, which is currently near Barbados, travels west through the Caribbean Sea this weekend. The tropical storm is expected to weaken once it hits higher wind shear in the central Carribean and moves toward Central America, forecasters had previously said.

Harvey could still dump up to four inches of rain over the Windward Islands, and warnings were issued for possible mudslides and flooding in the region.

Forecasters are also watching a third tropical disturbance in the far eastern Atlantic, several hundred miles west-southwest of the Cabo Verde Islands, which could develop as it encounters favorable conditions early next week. Forecasters put formation chances for the storm, which is moving northwest at about 20 miles an hour, at about 40 percent in the next five days.