Julia has maximum sustained winds Tuesday near 75 mph (120 kph) with some additional strengthening expected during the next day or so.
The hurricane is located about 330 miles (535 kilometers) west of the Cape Verde Islands and is moving west-northwest near 12 mph (19 kph).
Meanwhile, powerful Hurricane Igor is moving west-northwest in the Atlantic on a track that could take the Category 4 storm toward Bermuda.
The National Hurricane Center in Miami says swells from Igor will begin affecting the Leeward Islands on Tuesday and reach into Puerto Rico and the Virgin Islands on Tuesday night and Wednesday.
