The system, dubbed Invest 90L, would be named Florence if it becomes a tropical storm. The system was moving west at about 12 miles per hour.
The National Hurricane Center is issuing advisories on Potential Tropical Cyclone 6, which is forecast to strengthen to Tropical Storm Florence and then a hurricane by Sunday.
The tropical disturbance that will be more interesting for us to watch back home in the U.S.is one gliding west-northwest near Puerto Rico and the outer Caribbean Islands.
In an 2 p.m. update, forecasters said the system had sustained winds of 30 miles per hour traveling west at 12 miles per hour.
In the meantime, the Cabo Verde Islands could experience heavy rain and gusty winds starting Friday.
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With the peak of hurricane season close at hand, there are signs that the tropical Atlantic may soon spring to life with the potential for direct impact on the coastal United States in the days ahead. The system that may develop near Cabo Verde the next few days is located to the far right.
Miriam is expected to enter the Central Pacific basin, which is where Hawaii is located, this afternoon at which point forecasters with the Honolulu-based Central Pacific Hurricane Center will assume responsibility for monitoring the storm.
On the forecast track, the storm was expected to make a turn toward the west-northwest with a decrease in forward speed Wednesday night followed by a turn toward the northwest and north through Friday night.
Of more immediate concern to South Florida is whether Labor Day weekend will be a washout.
Rain chances will range from 30 percent along the coast to 40-50 percent west of I-95.