Tropical Storm Nana, heading toward Central America, is the earliest 14th named storm to form in the Atlantic Ocean./Credit:	CNN Weather

Tropical Storm Nana, heading toward Central America, is the earliest 14th named storm to form in the Atlantic Ocean./Credit: CNN Weather

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Nana, churning toward Central America, is the earliest 14th named storm to form in Atlantic

A vigorous tropical disturbance has become Tropical Storm Nana in the Caribbean, says the National Hurricane Center.