The National Hurricane Center is monitoring an area of low pressure in the Caribbean, just south of Cuba, that could develop into a tropical system over the next several days.
Forecasters say the area of disturbed weather is located in the northwestern Caribbean Sea but is expected to move slowly across Cuba and approach the Florida Keys by Thursday.
The system could develop as it nears the Florida peninsula or the northwestern Bahamas on Friday or Saturday, but weaken early next week when it encounters upper-level winds, forecasters said.
There is a 10 percent for tropical development over the next two days, and 20 percent over the next five days, forecasters said.
Whether it develops into a named storm, heavy rain is forecast for Cuba, southern Florida, the Florida Keys and the Bahamas over the next several days.