MIAMI (CBSMiami) – Tropical Depression Nine has formed off the coast of Africa.

The National Hurricane Center reports Tropical Depression Nine has winds of 30 mph and is moving west at 10 mph.

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As of 5:00 p.m., Tropical storm warnings are in effect for the southern Cape Verde Islands of Maio, Santiago, Fogo and Brava.

Tropical storm conditions are expected within 24 to 36 hours, but the center of the depression should stay to the south of the Cape Verde Islands.

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Forecasters expect the depression to eventually become a tropical storm Monday.

Tropical Depression Nine could produce 4 to 8 inches of rain across the Cape Verde Islands with some isolated 12 inch amounts.

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The depression is expected to become Humberto and could be the first hurricane of the 2013 season.